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San Luis Obispo County, California

285 topographic sheets cover 102 settlements here, and 32 properties are on the National Register of Historic Places.

Research this county

From the record

32 National Register listings published here, 2 of them National Historic Landmarks.

Sources: the National Register database, National Park Service

California within the United States
San Luis Obispo County within California

What the record shows

  • 2,777 topographic sheet readings cover the county's settlements.
  • 32 properties here are on the National Register of Historic Places: 26 buildings, 5 districts and 1 site.
  • 5 of the 32 listings were added during the 1970s.
  • The Geographic Names Information System records 102 populated places in this county; 102 are covered by at least one topographic sheet.

Places on the National Register

32

Every property in this county listed on the National Register of Historic Places, with the year it was listed and the federal nomination document.

Photograph PropertyType ListedReference
Administration Building, Atascadero Colonybuilding197777000336
Ah Louis Storebuilding200808000203
Myron Angel Housebuilding198282000988
Arroyo Grande IOOF Hallbuilding199191000344
Atascadero Printerybuilding200400001368
Bank of Italybuilding199898000245
Brewster-Dutra Housebuilding198282000989
Caledonia Adobebuilding197171000190
Call-Booth Housebuilding198888002031
Corral de Piedrasite197878000766
Dana Adobebuilding197171000189
Eight Mile Housebuilding199595000358
Guthrie Housebuilding198080000853
Halcyon Historic Districtdistrict2017100000783
Hearst San Simeon Estatebuilding197272000253
Robert Jack Housebuilding199292000312
Lincoln Schoolbuilding200101001244
Monday Club of San Luis Obispobuilding201616000230
Morro Bay State Park Trailer and Tent Campgrounddistrict201414000852
Old Santa Rosa Catholic Church and Cemeterybuilding198282000990
Pacific Coast Railway Company Grain Warehousebuilding198888000921
Paso Robles Almond Growers Association Warehousebuilding201616000095
Pereira Octagon Barnbuilding201413001068
Piedras Blancas Light Stationdistrict199191001095
Powerhouse, Thebuilding199393000670
John Price Housedistrict198888002013
Paso Robles Carnegie Librarybuilding199897001635
San Luis Obispo Carnegie Librarybuilding199595000357
San Luis Obispo Light Stationdistrict199191001093
Tognini and Ghezzi Buildingbuilding2025100012304
Tribune-Republic Buildingbuilding199393000548
William Shipsey Housebuilding201010000115

Photographs from libraries nationwide

14 of 25 shown

Selected from the Digital Public Library of America's 25 image records catalogued for this county. Every one shown here carries a public-domain status or a licence that permits reuse on a site that carries advertising; non-commercial, share-alike and restricted images are excluded. The selection is spread across the county's towns (at most eight per town), so no single institution's bulk upload crowds out the rest. Each opens the holding library's record, and the complete set at the Digital Public Library of America is one click away.

Ritz Motel, U. S. 101, No. end, San Luis Obispo, Calif., Boston Public Library - undated
Ritz Motel, U. S. 101, No. end, San Luis Obispo, Calif.. Boston Public Library, via the Digital Public Library of America.
Ritz Motel, U. S. 101, No. end, San Luis Obispo, Calif., Boston Public Library - undated
Ritz Motel, U. S. 101, No. end, San Luis Obispo, Calif.. Boston Public Library, via the Digital Public Library of America.
Airport obstruction chart, OC 858, Paso Robles Municipal Airport, Paso Robles, California, Boston Public Library - undated
Airport obstruction chart, OC 858, Paso Robles Municipal Airport, Paso Robles, California. United States. National Ocean Service, Boston Public Library, via the Digital Public Library of America.
Barr's Drive-In Restaurant, Boston Public Library - undated
Barr's Drive-In Restaurant. Boston Public Library, via the Digital Public Library of America.
Motel Inn, San Luis Obispo, Cal., U. S. 101, North City Limits, Boston Public Library - undated
Motel Inn, San Luis Obispo, Cal., U. S. 101, North City Limits. Boston Public Library, via the Digital Public Library of America.
Hotel Pismo, Boston Public Library - undated
Hotel Pismo. Boston Public Library, via the Digital Public Library of America.
The Clifton Motel, 125 Spring Street (U. S. 101) Paso Robles, Calif., Boston Public Library - undated
The Clifton Motel, 125 Spring Street (U. S. 101) Paso Robles, Calif.. Boston Public Library, via the Digital Public Library of America.
Airport obstruction chart, OC 989, San Luis Obispo County-McChesney Field, San Luis Obispo, California, Boston Public Library - undated
Airport obstruction chart, OC 989, San Luis Obispo County-McChesney Field, San Luis Obispo, California. United States. National Ocean Service, Boston Public Library, via the Digital Public Library of America.
Cambria Pines Lodge, Cambria, California, Boston Public Library - undated
Cambria Pines Lodge, Cambria, California. Boston Public Library, via the Digital Public Library of America.
Holmes Motel, Boston Public Library - undated
Holmes Motel. Boston Public Library, via the Digital Public Library of America.
Sunbeam Motel, 1656 Monterey St. (U. S. 101), North End, San Luis Obispo, Calif., Boston Public Library - undated
Sunbeam Motel, 1656 Monterey St. (U. S. 101), North End, San Luis Obispo, Calif.. Boston Public Library, via the Digital Public Library of America.
Ranchotel -- On U. S. 101, No. Entrance -- San Luis Obispo, Calif., Boston Public Library - undated
Ranchotel -- On U. S. 101, No. Entrance -- San Luis Obispo, Calif.. Boston Public Library, via the Digital Public Library of America.
Pismo Palisades Motel, U. S. 101, Pismo Beach, Calif., Just North of City Limits, Boston Public Library - undated
Pismo Palisades Motel, U. S. 101, Pismo Beach, Calif., Just North of City Limits. Boston Public Library, via the Digital Public Library of America.
Mar Vista Motor Lodge, U. S. 101, Pismo Beach, Calif., Boston Public Library - undated
Mar Vista Motor Lodge, U. S. 101, Pismo Beach, Calif.. Boston Public Library, via the Digital Public Library of America.

The county from the air

48 shown

Flown by the U.S. Geological Survey between 1937 and 1989, the Aerial Photo Single Frames collection is the definitive mid-century view of the land: fields, roads and rivers as the camera saw them. The Survey holds 8,007 frames inside the rectangle that bounds this county; the 48 frames below were taken over the county itself, chosen across the decades of flights (at most four a year from that rectangle), so one flight cannot crowd out the rest. The full set is free to browse and download at EarthExplorer under the dataset Aerial Photo Single Frames.

U.S. Geological Survey aerial photograph, 1954-07-15, scale 1:63000
1954-07-15, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1954-07-15, scale 1:63000
1954-07-15, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1955-02-09, scale 1:63000
1955-02-09, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1955-02-09, scale 1:63000
1955-02-09, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1955-02-09, scale 1:63000
1955-02-09, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1956-06-27, scale 1:34000
1956-06-27, scale 1:34000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1956-06-27, scale 1:34000
1956-06-27, scale 1:34000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1958-01-28, scale 1:48000
1958-01-28, scale 1:48000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1958-01-28, scale 1:48000
1958-01-28, scale 1:48000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1958-01-28, scale 1:48000
1958-01-28, scale 1:48000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1958-01-28, scale 1:48000
1958-01-28, scale 1:48000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1963-07-02, scale 1:24000
1963-07-02, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1963-07-02, scale 1:24000
1963-07-02, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1963-07-02, scale 1:24000
1963-07-02, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1963-07-02, scale 1:24000
1963-07-02, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1964-07-31, scale 1:20000
1964-07-31, scale 1:20000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1964-07-31, scale 1:20000
1964-07-31, scale 1:20000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1964-07-31, scale 1:20000
1964-07-31, scale 1:20000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1964-07-31, scale 1:20000
1964-07-31, scale 1:20000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1966-06-17, scale 1:21670
1966-06-17, scale 1:21670. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1967-06-27, scale 1:24000
1967-06-27, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1967-06-27, scale 1:24000
1967-06-27, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1967-06-27, scale 1:24000
1967-06-27, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1952-08-15, scale 1:23600
1952-08-15, scale 1:23600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1952-08-15, scale 1:23600
1952-08-15, scale 1:23600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1952-08-15, scale 1:23600
1952-08-15, scale 1:23600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1952-08-15, scale 1:23600
1952-08-15, scale 1:23600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1953-06-01, scale 1:37400
1953-06-01, scale 1:37400. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1953-06-01, scale 1:37400
1953-06-01, scale 1:37400. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1953-06-01, scale 1:37400
1953-06-01, scale 1:37400. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1953-06-01, scale 1:37400
1953-06-01, scale 1:37400. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1954-07-15, scale 1:63000
1954-07-15, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1954-07-15, scale 1:63000
1954-07-15, scale 1:63000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1955-07-18, scale 1:47200
1955-07-18, scale 1:47200. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1956-06-27, scale 1:34000
1956-06-27, scale 1:34000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1956-06-27, scale 1:34000
1956-06-27, scale 1:34000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1960-04-01, scale 1:61600
1960-04-01, scale 1:61600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1960-04-01, scale 1:61600
1960-04-01, scale 1:61600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1960-04-01, scale 1:61600
1960-04-01, scale 1:61600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1960-04-01, scale 1:61600
1960-04-01, scale 1:61600. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1966-08-12, scale 1:23330
1966-08-12, scale 1:23330. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1966-08-12, scale 1:23330
1966-08-12, scale 1:23330. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1966-08-12, scale 1:23330
1966-08-12, scale 1:23330. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1967-06-27, scale 1:24000
1967-06-27, scale 1:24000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1968-07-01, scale 1:125000
1968-07-01, scale 1:125000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1968-07-01, scale 1:125000
1968-07-01, scale 1:125000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1968-07-01, scale 1:125000
1968-07-01, scale 1:125000. U.S. Geological Survey aerial photograph.
U.S. Geological Survey aerial photograph, 1968-07-01, scale 1:125000
1968-07-01, scale 1:125000. U.S. Geological Survey aerial photograph.

Weather records

49 stations, 37 gages

The thermometers that kept this county's weather, and the gages that measured the flow of its streams, as the federal records hold them. The extremes below are measured values from those records, not estimates.

The 1950 census, district by district

72 districts

Who lived here in 1950, one enumeration district at a time, as the Census Bureau described each district. Each row opens its official National Archives result, with Population Schedules and ED Maps available there.

  • 40-1Arroyo Grande Judicial Township: Arroyo Grande city: Arroyo Grande city - That part east of Pacific Coast Railroad, Branch, Bridge, U.S. Hwy. 101
  • 40-2Arroyo Grande city - That part west of Pacific Coast Railroad, Branch, Bridge, U.S. Hwy. 101
  • 40-3Pismo Beach city: Pismo Beach city - That part east of U.S. 101
  • 40-4Pismo Beach city - That part west of U.S. Hwy. 101
  • 40-5Oceano, unincorporated (See boundaries shown on aerial photo AXH-102-88)
  • 40-6Shell Beach, unincorporated Bounded by U.S. Railway 101; Pismo Beach city limits; County line; Unnamed Stream
  • 40-7Arroyo Grande Judicial Township - That part Bounded by Judicial Township line; Judicial Township line; County line, Judicial Township line; Arroyo Grande city limits, Unnamed road parallel to Arroyo Grande Creek and Lopez Canyon, Judicial Township line
  • 40-8Arroyo Grande Judicial Township - That part outside Grover city - Fair Oaks, unincorporated (See separate map for boundaries of Grover city - Fair Oaks) Founded by Judicial Township line; Unnamed road parallel to Lopez Canyon and Arroyo Grande Creek; Arroyo Grande city limits, U.S. Hwy. 101; Pismo Beach city limits, Pismo Creek, State Hwy. 147, Judicial Township line
  • 40-9Arroyo Grande Judicial Township - That part outside Shell Beach, unincorporated, and including Lion, Pecho, Lone Black and White Rock Islands (See separate map for boundaries of Shell Beach) Bounded by Judicial Township line; State Hwy. 147, Pismo Creek; Pismo Beach city limits, U.S. Hwy. 101, Unnamed Stream, County line; County line
  • 40-10AN/A
  • 40-10BN/A
  • 40-11Arroyo Grande Judicial Township - That part outside Oceano, unincorporated (See aerial photo AXH-102-88 for boundaries of Oceano) Bounded by Oceano unincorporated boundary, Arroyo Grande city limits; Judicial Township line; Judicial Township line; County line
  • 40-12Atascadero Judicial Township: Atascadero, unincorporated: Atascadero, unincorporated - That part Bounded by Judicial Township line (Salinas River); Offset line 200ft. southeast of and parallel to Acacia Rd., Southern Pacific Railroad, Offset line 200ft. southeast of and parallel to Palomar Ave. extended and Palomar Ave.; U.S. Hwy. 101, Judicial Township line
  • 40-13Atascadero, unincorporated - That part Bounded by U.S. Hwy. 101; Offset line 200ft. south and southwest of and parallel to San Rafael Rd. and San Gabriel Rd.; Santa Ana Rd., Santa Lucia Rd., Graves Creek, Offset line 200ft. west of and parallel to Montery Rd., Offset line 200ft. north of and parallel to Del Rio Rd., Graves Creek
  • 40-14Cholame Judicial Township
  • 40-15Morro Judicial Township: Morro Bay, unincorporated Bounded by State Hwy. 56; Unnamed road, Chorro Creek; Chorro Creek; Morro Bay, Morro Creek
  • 40-16Morro Judicial Township - That part outside Morro Bay, unincorporated (See separate map for boundaries of Morro Bay) Bounded by Judicial Township line; Judicial Township line, U.S. Hwy. 466; U.S. Hwy. 466, State Hwy. 56, Morro Creek, Morro Bay; County line
  • 40-17CMorro Judicial Township - That part outside Morro Bay, unincorporated (See separate map for boundaries of Morro Bay) Bounded by U.S. Hwy. 466, Judicial Township line; Judicial Township line, National Guard Training Camp boundary; State Hwy. 56
  • 40-17BMorro Judicial Township - That part comprising National Guard Training Camp
  • 40-17AMorro Judicial Township - That part Bounded by Judicial Township line; Judicial Township line; Judicial Township line, State Hwy. 56; National Guard Training Camp boundary
  • 40-18Morro Judicial Township - That part outside Morro Bay, unincorporated (See separate map for boundaries of Morro Bay) including Morro Rock Bounded by Morro Bay, Chorro Creek, Unnamed road, State Hwy. 56; State Hwy. 56, Judicial Township line; Judicial Township line; County line
  • 40-19Nipomo Judicial Township: Nipomo Judicial Township - That part Bounded by Judicial Township line; Judicial Township line, County line; County line; U.S. Hwy. 101, Judicial Township line
  • 40-20Nipomo Judicial Township - That part Bounded by U.S. Hwy. 101; County line; Bromela - Bonita School Rd., State Hwy. 56, Judicial Township line
  • 40-21Nipomo Judicial Township - That part Bounded by Judicial Township line; State Hwy. 56, Bromela - Bonita School Rd.; County line; County line
  • 40-22Paso Robles Judicial Township: El Paso de Robles city: El Paso de Robles city - That part Bounded by City limits; City limits; 17th extended, 17th; Southern Pacific Railroad
  • 40-23El Paso de Robles city - That part Bounded by City limits; Southern Pacific Railroad; 23rd Vine, City limits
  • 40-24El Paso de Robles city - That part Bounded by City limits; Vine; 17th; City limits
  • 40-25El Paso de Robles city - That part Bounded by 23rd; Southern Pacific Railroad; 17th; Vine
  • 40-26El Paso de Robles city - That part excluding Taylor Hotel Bounded by 17th, 17th extended; City limits; 11th extended, 11th; Spring
  • 40-27Taylor Hotel (In El Paso de Robles city)
  • 40-28Paso de Robles city - That part Bounded by 17th; Spring; 13th, Chestnut, 12th; City limits
  • 40-29El Paso de Robles city - That part Bounded by 12th, Chestnut, 13th; Spring; 8th, Olive, Pacific; City limits
  • 40-30El Paso de Robles city - That part Bounded by 11th, 11th extended; City limits; City limits; Spring
  • 40-31El Paso de Robles city - That part Bounded by Pacific, Olive, 8th; Spring; City limits; City limits
  • 40-32Paso Robles Judicial Township - That part east of Salinas River, outside El Paso de Robles city
  • 40-33Paso Robles Judicial Township - That part west of Salinas River, outside El Paso de Robles city
  • 40-34San Luis Obispo Judicial Township: San Luis Obispo city: San Luis Obispo city - That part excluding Motel Inn Bounded by City limits; City limits; Bishop; Johnson Ave., Essex, Southern Pacific Railroad, Monterey, Dana Ave., Hays, Henderson Ave.
  • 40-35Motel Inn (In San Luis Obispo city)
  • 40-36San Luis Obispo city - That part Bounded by City limits; Henderson Ave., Hays, Dana Ave.; Abbott, Grand Ave., Murray; Park Ave.
  • 40-37San Luis Obispo city - That part Bounded by Hathway, City limits; Park Ave.; Murray; Kentucky Ave.
  • 40-38San Luis Obispo city - That part Bounded by City limits; City limits, Hathway, Kentucky Ave.; Murray, Murray Ave., N. Broad, Serrano Dr.; City limits
  • 40-39San Luis Obispo city - That part Bounded by City limits, Serrano Dr.; N. Broad, Broad, Peach, Nipomo, Higuera, U.S. Hwy. 101; City limits; City limits
  • 40-40San Luis Obispo city - That part Bounded by Murray Ave.; Chorro; Higuera; Nipomo, Peach, Broad, N. Broad
  • 40-41San Luis Obispo city - That part Bounded by Murray Ave.; Santa Rosa; Peach; Chorro
  • 40-42San Luis Obispo city - That part Bounded by Murray Ave., Murray; Grove; Peach, Johnson Ave., 2nd, Fig; Santa Rosa
  • 40-43San Luis Obispo city - That part Bounded by Murray, Grand Ave., Abbott; Dana Ave., Monterey; Ida; Peach, Grove
  • 40-44San Luis Obispo city - That part Bounded by Fig, 2nd, Johnson Ave., Peach; Ida; Monterey; Santa Rosa
  • 40-45San Luis Obispo city - That part Bounded by Peach; Santa Rosa; Monterey; Chorro
  • 40-46San Luis Obispo city - That part Bounded by Monterey; Southern Pacific Railroad; Pismo; Osos
  • 40-47San Luis Obispo city - That part excluding Anderson Hotel Bounded by Higuera, Chorro, Monterey; Osos; Buchon; Broad
  • 40-48Anderson Hotel (In San Luis Obispo city)
  • 40-49San Luis Obispo city - That part Bounded by Higuera; Broad; Pismo; Higuera (U.S. Hwy. 101)
  • 40-50San Luis Obispo city - That part Bounded by Pismo; Broad; High
  • 40-51San Luis Obispo city - That part Bounded by Buchon; Osos, Southern Pacific Railroad; High; Broad
  • 40-52San Luis Obispo city - That part Bounded by Pismo; Southern Pacific Railroad; Osos
  • 40-53San Luis Obispo city - That part Bounded by Essex, Johnson Ave., Bishop, City limits; City limits; City limits; City limits, Southern Pacific Railroad
  • 40-54San Luis Obispo city - That part Bounded by High; Southern Pacific Railroad; City limits; City limits, Broad
  • 40-55San Luis Obispo city - That part Bounded by High; Broad; South; Higuera (U.S. Hwy. 101)
  • 40-56San Luis Obispo city - That part Bounded by South; Broad; City limits; Higuera (U.S. Hwy. 101)
  • 40-57San Luis Obispo Judicial Township - That part Bounded by Judicial Township line; Judicial Township line; Judicial Township line; San Luis Obispo city limits, Judicial Township line
  • 40-58San Luis Obispo Judicial Township - That part Bounded by San Luis Obispo city limits; Judicial Township line; Judicial Township line; Judicial Township line
  • 40-59San Miguel Judicial Township: San Miguel, unincorporated Bounded by 19th, 19th extended; Salinas River; Unnamed road, San Miguel Canyon Rd.; J
  • 40-60ASan Miguel Judicial Township - That part west of U.S. Hwy. 101, outside San Miguel, unincorporated, and excluding Camp Roberts (See separate map for boundaries of San Miguel)
  • 40-60BSan Miguel Judicial Township - That part east of U.S. Hwy. 101, outside San Miguel, unincorporated, and excluding Camp Roberts and Paso Robles School for Boys (See separate map for boundaries of San Miguel)
  • 40-61Camp Roberts (In San Miguel Judicial Township)
  • 40-62Paso Robles School for Boys (In San Miguel Judicial Township)
  • 40-63San Simeon Judicial Township, including Pico, Cambria, and White Rock Islands
  • 40-64Santa Margarita Judicial Township: Santa Margarita Judicial Township - That part Bounded by Judicial Township line; County line; County line, Judicial Township line; Hi Mt. - Pozo Rd., State Hwy. 58, San Juan Creek
  • 40-65Santa Margarita Judicial Township - That part Bounded by Judicial Township line; San Juan Creek, State Hwy. 58, Hi Mt. - Pozo Rd.; Judicial Township line; Judicial Township line
  • 40-66Templeton Judicial Township: Templeton Judicial Township - That part east of U.S. Hwy. 101
  • 40-67Templeton Judicial Township - That part west of U.S. Hwy. 101
  • 40-68Atascadero Judicial Township - That part outside Atascadero, unincorporated (See separate map for boundaries of Atascadero)

Wildfire, 1992 to 2020

4,554 fires

Every wildfire the federal occurrence database records inside this county: 4,554 of them, burning about 394,842 acres. 70 started naturally and 130 were recorded as arson. Each settlement page carries the fires within five miles of it.

Reported cause Fires
Missing data/not specified/undetermined1966
Equipment and vehicle use1612
Debris and open burning350
Misuse of fire by a minor139
Arson/incendiarism130
Power generation/transmission/distribution99
Smoking90
Recreation and ceremony81
Natural70
Other causes6
Railroad operations and maintenance6
Firearms and explosives use4
Fireworks1

The five largest, by the area the report gives. One of them was set deliberately.

DateCause SizeReported by Name on the report
15 August 1996Equipment and vehicle use106,668 acresLos Padres National ForestHIGHWAY 58
4 August 1997Missing data/not specified/undetermined49,490 acresLos Padres National ForestLOGAN
14 August 1994Arson/incendiarism48,851 acresCentral California DistrictHWY 41
13 August 2016Missing data/not specified/undetermined46,235 acresCalifornia Department of Forestry & Fire ProtectionCHIMNEY
6 July 2017Missing data/not specified/undetermined28,687 acresCalifornia Department of Forestry & Fire ProtectionALAMO
22 July 2000Equipment and vehicle use6,762 acresCentral California DistrictSHELL
23 September 2011Missing data/not specified/undetermined5,050 acresSan Luis Obispo Unitnot named
18 May 2016Missing data/not specified/undetermined3,712 acresSan Luis Obispo UnitCAMP ROBERTS

Every settlement page carries the fires within five miles of it - see the settlement index below.

Storms, 1993 to 2026

60 of 83 shown

The NOAA Storm Events Database holds 83 reports for this county, causing 3 deaths, 1 injury and about $5,344,000 in recorded property damage. Each settlement page carries the reports that name it.

Kind of event Reports
Flash Flood29
Thunderstorm Wind16
Flood11
Heavy Rain8
Hail5
Tornado4
Funnel Cloud3
Debris Flow3
Waterspout2
Frost/Freeze1
Wildfire1

The most serious of them, by death, then injury, then recorded damage. The accounts are quoted exactly as the forecast office filed them.

WhenEvent Place namedHarm What the report says
January 2023Flash FloodWellsona1 killed, 1 hurtA woman and her 5 year old child were swept down a flooded roadway near San Marcos Creek. The woman survived, but her 5 year old child died.
January 2023Flash FloodAvila Beach1 killedA 60 year old woman was swept away in her SUV by raging flood waters along Avila Beach Road.
December 2004Heavy RainCountywide1 killedno account filed
January 2005Heavy RainCountywide$5,000,000no account filed
August 2002WildfirePaso Robles$290,000A wildfire burned 715 acres of forest in San Luis Obispo County, about 12 miles east of Paso Robles. The fire cost about $290,000 to fight, but resulted in no deaths or injuries.
February 1993Thunderstorm WindSan Luis Obispo and$50,000Later the same day a thunderstorm caused damage to many of the same areas as winds to nearly 50 mph. Pea-sized hail was reported at Pismo Beach. Power outages due to lightning strikes were reported in Nipomo and San Luis Obispo. An observer in Solvang, Santa Barbara County, reported 135 separate lightning strikes during the storm. Portions of U.S. Highway 101 were closed due to flooding, mudslides, and hail on the road. A truck hydroplaned south of Buellton with no injuries reported. Elsewhere in Santa Barbara County secondary roads were also closed due to widespread minor flooding from the heavy rains.
September 2025Thunderstorm WindAdelaida$2,000Strong thunderstorms generated gusty winds around the 7400 block of Vineyard Drive in the community of Templeton. A couple trees and power lines were knocked down.
October 2025Thunderstorm WindCambria$1,000Strong thunderstorms generated gusty winds. A large tree was knocked down across Santa Rosa Creek Road.
September 2025Thunderstorm WindCambria$1,000Strong thunderstorms generated gusty winds in the community of Cambria. Law enforcement reported a tree was knocked down.
February 2026Thunderstorm WindCushing-Strong thunderstorm winds, estimated to be gusting to 58 MPH, were reported at the La Entrada Road sensor.
February 2026Thunderstorm WindLos Osos-Strong thunderstorm winds, gusting to 75 MPH, were reported at the Las Osos sensor.
February 2026Thunderstorm WindSerrano-Strong thunderstorm winds, gusting to 61 MPH, were reported at the Mount Lowe sensor.
February 2026Thunderstorm WindSimmler-Strong thunderstorm winds, gusting to 72 MPH, were reported at the Fellows VOR sensor.
February 2026Thunderstorm WindSimmler-Strong thunderstorm winds, gusting to 72 MPH, were reported at the Carrizo RAWS.
October 2025Flash FloodArroyo Grande-California Highway Patrol reported flooding along Highway 101 at Grand Avenue.
October 2025Flash FloodArroyo Grande-California Highway Patrol reported heavy rain and flooding around the intersection of Highway 101 and Fair Oaks Avenue.
February 2024Tornado (EF1)Grover City-A brief EF1 tornado developed in the Grover Beach area. Estimated wind speeds were 95 MPH. Several power poles were snapped and some roof damage to a greenhouse was reported.
February 2024Tornado (EF1)Baywood Park-A brief EF1 tornado impacted the Los Osos area. The tornado traveled about 5 miles with estimated wind speeds of 95 MPH. Numerous trees were uprooted and damaged power poles, buildings and vehicles.
February 2024Funnel Cloud(Sbp)San Luis Obispo-Several reports of funnel clouds were received near Buckley Road in the community of San Luis Obispo.
February 2024Thunderstorm WindSerrano-An automated sensor at Mount Lowe reported a thunderstorm wind gust of 66 MPH.
February 2024Flash FloodBromela-In the community of Nipomo, several vehicles were trapped in flood waters near the intersection of Guadalupe Road and Division Street.
February 2024Debris FlowNipomo-Heavy rainfall resulted in a mudslide across Highway 101 near the junction of Highway 166.
February 2024Flash FloodBromela-Significant flooding on Highway 1 resulted in several vehicles being stuck in the flood waters.
February 2024Flash FloodBromela-Significant flooding resulted in the closure of Highway 1, in both directions, near Oso Flacco Road.
February 2024Debris FlowNipomo-Heavy rainfall resulted in a mudslide across Highway 166 near Sandy Creek Road.
February 2024Flash FloodEstrella-Flash flooding was reported at the intersection of Airport Road and Estrella Road.
February 2024Flash FloodWellsona-Swift water rescue teams rescued two people from San Marcos Creek.
February 2024Flash FloodPaso Robles-Swift water rescue teams rescued three people from the Salinas River.
February 2024Flash FloodPaso Robles-Flash flooding resulted in the closure of a section of Buena Vista Drive, near Paso Robles.
February 2024Debris FlowSan Miguel-Heavy rainfall generated a mudslide across River Road.
January 2023Flash FloodPismo Beach-Significant flash flooding reported near Dolliver and Highway 1 intersection.
January 2023FloodGuadalupe-Heavy rainfall produced flash flooding across Branch Mill Road. Law enforcement reported significant mud and debris across the roadway.
January 2023Flash FloodSanta Margarita-Heavy rainfall produced flash flooding on Las Pilitas Road near Lake Santa Margarita. The bridge was impassable due to flooding.
January 2023Flash FloodGuadalupe-Heavy rainfall produced flash flooding near Creston Road. The flooded river severely damaged the bridge.
January 2023Flash FloodNipomo-Heavy rainfall produced a mudslide across the intersection of Huasna Road and Huasna Townsite Road.
January 2023Flash Flood(Sbp)San Luis Obispo-Heavy rain produced flash flooding, south of the city of San Luis Obispo. Law enforcement reported a vehicle stuck in the mud.
March 2023Flash FloodAtascadero-Heavy rainfall produced flash flooding near the community of Atascadero in San Luis Obispo county. California Highway Patrol reported mud and rocks across Highway 41.
March 2023Flash FloodSycamore Spgs-Heavy rainfall produced flash flooding in San Luis Obispo county. California Highway Patrol reported road closures between Avila Beach Drive and San Luis Bay drive, due to flooding.
March 2023Flash FloodAdelaida-California Highway Patrol reported Chimney Rock Road was completely washed out, due to heavy rain and flash flooding.
March 2023Flash FloodCholame-California Highway Patrol reported significant flooding in the community of Cambria in San Luis Obispo county. At a gas station, water rose to a depth up to half of the gas pumps.
March 2023Flash FloodGorman-California Highway Patrol reported mud and debris completely blocking York Mountain Road and Shadow Canyon Road.
January 2021Flash FloodCanbria-Heavy rain produced flash flooding in the community of Cambria in San Luis Obispo county. Along Sherwood Drive, several homes were inundated with water and mud, due to the heavy rain.
January 2021Flash FloodSycamore Spgs-Heavy rain fell over the Avila Fire burn scar, producing a mud and debris flow. The northbound lanes of Highway 101 were closed due to mud and debris from the burn scar.
January 2021Flash FloodCambria Pines-Heavy rain produced significant urban flooding in the community of Cambria. Along Windsor Boulevard, a vehicle was stuck with flooding impacted the roadway. The motorist was rescued.
March 2017HailCreston-A severe thunderstorm developed near the community of Creston. One inch diameter hail was reported with the storm.
May 2016Flash FloodCholame-California Highway Patrol reported flash flooding and mud and debris flows across sections of Highway 46, northeast of Shandon.
June 2015Flash FloodSimmler-Strong thunderstorms produced flash flooding and mud/debris flows in southeast San Luis Obispo county. California Highway Patrol reported flash flooding at the intersection of Highway 33 and Highway 166.
January 2010Thunderstorm WindGrover City-A trained spotter in the Grover Beach area reported a thunderstorm wind gust of 58 MPH.
January 2010Thunderstorm WindCayucos-A trained spotter in the Cayucos area reported a thunderstorm wind gust of 58 MPH.
November 2010Flash FloodBromela-California Highway Patrol reported flash flooding in southern San Luis Obispo County. Due to heavy rain, the roadway was completely washed away at the intersection of Highway 1 and Division Street.
December 2009Thunderstorm WindGrover City-A trained weather spotter reported a wind gust of 58 MPH associated with a severe thunderstorm.
May 2009HailSimmler-The Cal Fire station in LaPanza reported a thunderstorm produced three quarter inch hail.
January 2008Flash FloodCambria-California Highway Patrol reported flash flooding along San Simeon Creek Road.
February 2004Tornado (F0)Oceano-A waterspout, which developed offshore of Oceano Dunes, came onshore as a weak tornado. The weak tornado hit a park ranger in his truck. Fortunately, the park ranger was not injured and his truck sustained no reportable damage.
April 1999Funnel CloudNipomo-Weather spotter reported a funnel cloud near Huasna.
January 1999FloodSan Luis Obispo-Urban flooding, along Los Osos road, was reported in the city of San Luis Obispo.
April 1998WaterspoutPismo Beach-A waterspout was reported by the Pismo Beach Fire Department.
April 1998Funnel CloudMorro Bay-A spotter in the Morro Bay area reported a funnel cloud.
May 1998Tornado (F0)San Luis Obispo-A small tornado developed over the city of San Luis Obispo. The tornado knocked out power to several hundred homes. Also, four homes were damaged, including a home struck by a fallen cypress tree.
February 1998WaterspoutMorro Bay-An observer at Morro Bay reported a waterspout two miles north of Morro Rock.

Mines and quarries

540 recorded

The Survey's mineral resources record lists 540 workings inside this county. 103 still produce and 437 are closed or unrecorded. Each settlement page carries the workings within five miles of it.

Commodity Workings
Chromium149
Sand and Gravel, Construction79
Mercury75
Manganese52
Copper34
Stone, Crushed/Broken33
Gold23
Uranium21
Gypsum-Anhydrite13
Limestone, General11
Diatomite8
Gold, Silver5
Nickel4
Stone4

The least common of them first, because a county's hundredth gravel pit says nothing its first ten did not.

Where SiteCommodity StatusRecorded
BarbaraCopper, Gold, SilverOccurrence
Barneberg MineManganese, Iron, Gold, Silver, MercuryProducer
DepositBarium-BariteOccurrence
Estrella MineChromium, Iridium, Platinum, Palladium, Ruthenium, RhodiumPast ProducerChromite
F ProspectCopper, Gold, Silver, UraniumProspect
Grieb Ranch QuarryFlagstoneProducer
HobsonCopper, ChromiumOccurrence
Hobson ClaimsChromium, Copper, ManganeseOccurrence1918
Isom ProspectManganese, ChromiumProspect1918
Los OsosCopper, Silver, Gold, Cobalt, NickelPast ProducerVein
Los Osos MineCopper, Gold, Sand and Gravel, ConstructionPast ProducerSedimentary
Oro FinoGold, SilverPast Producer
Prefumo Canyon ProspectsIron, ManganeseProspect1942
RidgeNickel, Silver, Gold, CopperOccurrenceSurface
Ridge ClaimCopper, Gold, Nickel, SilverProspect
S. Aumaier DepositDolomiteOccurrence
Santa Margarita Platinum OccurrencePlatinumOccurrence
Seeley GroupIron, ChromiumPast Producer1880
Soda Lake DepositSodiumPast Producer
Unnamed ProspectFeldspar, MicaProspect
3 Bar 5 Ranch PitStone, DimensionProducer
Antelope Mud CompanyClayPast Producer1935
Caen QuarryStone, DimensionPast Producer
Ezra Carpenter DepositMarble, DimensionOccurrence
Johe Ranch MineManganese, SilicaPast Producer1916, 1917
Kessler Onyx DepositMarble, DimensionPast Producer
Marquart MineAntimonyProspect
New London MineChromium, IronPast Producer1882, 1883
Prodigal SonGold, Silver, CopperOccurrenceVein
Questa ProspectChromium, Platinum, Palladium, Iridium, Ruthenium, RhodiumOccurrenceChromite
San Luis Brick Works, Inc.ClayProducer
San Simeon Creek DepositAntimonyPast Producer
Staneuche MineManganese, SilicaPast Producer1917, 1918
Sweetwater MineChromium, Platinum, Palladium, Iridium, Ruthenium, RhodiumPast Producer1885
West Norcross MineChromium, IronPast Producer
Yoakum TractGold, Silver, CopperOccurrence
Yoakum TractCopper, Silver, GoldProspect
Barnaberg MineMagnesiteProducer
Kiser Ranch DepositMagnesiteOccurrence
Newsome Marl DepositCalciumOccurrence
San Simeon Creek Shell DepositsCalciumOccurrence
Santa Margarita Ranch Shell Dep.CalciumPast Producer
Steele Ranch MagnesiteMagnesiteOccurrence
Grey Eagle MinePumicePast Producer
Lee QuarryStoneProducer
Manini PropertyNickelOccurrence1945
Maninni Nickel PropertyNickelOccurrence
McKinney Iron MinesIronOccurrence
Mora Brothers QuarryStonePast Producer
Outpost Nos. 1 & 2 ClaimsChromium, IronProspect1880
Pick and Shovel MineChromium, IronPast Producer1880
Porfumo Canyon Iron OccurrencesIronOccurrence
Rodrigues PitStoneProducer
San Luis ObispoNickelOccurrence
San Luis Obispo NickelNickelOccurrence1955
Unnamed Pumice OccurrencePumiceOccurrence
Unnamed Pumice OccurrencePumiceOccurrence
Unnamed QuarryPumicePast Producer
Unnamed QuarryStonePast Producer
Bee Tee ProspectUranium, Gold, SilverOccurrence
Fraser Canyon ProspectUranium, Gold, SilverProspect
Los Osos MineCopper, Gold, SilverPast Producer
Pine Mountain Trail ProspectUranium, Gold, SilverOccurrence
San RamonCopper, Gold, SilverPast ProducerVein
Ferrell DepositDiatomiteOccurrence
Los Penascos Ranch DepositDiatomiteOccurrence
Pismo Heights Co.DiatomiteOccurrence
San Luis Range DiatomiteDiatomitePast Producer
The Incello CompanyDiatomiteOccurrence
Unnamed Diatomite DepositDiatomiteOccurrence
Unnamed Diatomite DepositDiatomiteOccurrence
Unnamed ProspectDiatomiteProspect
Almaden DepositLimestone, GeneralOccurrence
Dubost DepositLimestone, GeneralProspect
Lime Mountain QuarryLimestone, GeneralProducer
Lopez Canyon GroupLimestone, GeneralProspect1924
Lowe, Porter, Et Al. Limestone Dep.Limestone, GeneralOccurrence
Lowe, Porter, Et Al. Limestone Dep.Limestone, GeneralOccurrence
Morgan Limestone DepositLimestone, GeneralOccurrence
Tassajara GroupLimestone, GeneralProspect
Unnamed Limestone DepositLimestone, GeneralOccurrence
Unnamed Limestone DepositLimestone, GeneralOccurrence
Unnamed Limestone DepositLimestone, GeneralOccurrence
Alano Creek DepositsGypsum-AnhydriteOccurrence
Arrisa MineGypsum-AnhydriteProducerSedimentary
Arroyo Grande Creek DepositGypsum-AnhydriteOccurrence
Beck Quarry #4Gypsum-AnhydriteProducer
Carrisa MineGypsum-AnhydritePast Producer
Carrizo Plain DepositsGypsum-AnhydritePast Producer
Chucker #3 MineGypsum-AnhydriteProducer
Farm Camp Quarry No. 5Gypsum-AnhydriteProducer
Fenceline Quarry #8Gypsum-AnhydriteProducer
Miller Well #2 MineGypsum-AnhydriteProducer
Shandon DepositGypsum-AnhydritePast Producer
Unnamed LocationGypsum-AnhydriteOccurrence
Wolforth Quarry #1Gypsum-AnhydriteProducer
A-34 ProspectGold, UraniumProspect
B.E. ProspectUraniumOccurrence
Barbara Jane ProspectUraniumOccurrence
Black WidowUraniumProspect
Clyde's Saylor ProspectUraniumOccurrence
Front Door GroupUraniumOccurrence
Haynes ProspectsGold, UraniumOccurrence
J ProspectUraniumOccurrence
La Panza ProjectUraniumProspect
La Panza ProspectUraniumOccurrence
Los Berros CanyonUraniumOccurrence
Mitchell PropertyUraniumOccurrence
Owen GroupUraniumProducer
Owen GroupUraniumPast Producer
Owen-Mitchell-HillbillyUraniumProducer
Reddin and Venezuela ProspectUraniumOccurrence
Santa Margarita ProspectsUraniumProspect
Surprise PlacerGold, UraniumProspect
American Canyon AreaGoldProspect
Beartrap Creek AreaGoldProspect
Frasier Canyon DepositGoldProspect
Gloria PlacerGoldProspect
Hangout PlacerGoldOccurrence
Jehovah Jireh PlacerGoldPast Producer
Last ChanceGoldPast Producer
Morning Star Placer Mining Co.GoldOccurrence
Navajo MinesGoldProspect
North Fork Willow Canyon AreaGoldProspect
O.S. Still Ranch PropertyGoldPast Producer
Queen Bee MineGoldProducer
Queen Bee MineGoldPast Producer
S. P. Dayton RanchGoldUnknown
San Ramon Nos. 1, 2, 3, & 4Copper, GoldPast Producer
Stanley Mountain Rare Ii AreaGoldProspect
Still Ranch PropertyGoldProducer
Unnamed ShaftGoldProspect
Unnamed ShaftGoldProspect
Bianchi QuarryStone, Crushed/BrokenProducer
Bishop'sS Peak QuarryStone, Crushed/BrokenPast Producer
Caen QuarryStone, Crushed/BrokenPast Producer
Cambria PitStone, Crushed/BrokenProducer
Cienega Creek QuarryStone, Crushed/BrokenProducer
Davis QuarryStone, Crushed/BrokenProducer
Dougherty QuarryStone, Crushed/BrokenPast Producer
Frank Tate Ranch PitStone, Crushed/BrokenPast Producer1915
Gravel PitStone, Crushed/BrokenPast Producer
Guerra QuarryStone, Crushed/BrokenProducer
Homeplace PitStone, Crushed/BrokenProducer
Kaiser-Santa Margarita PitStone, Crushed/BrokenProducer
Kolrich PitStone, Crushed/BrokenProducer
Land Red Rock PitStone, Crushed/BrokenProducer
Lee QuarryStone, Crushed/BrokenPast Producer
Millhollin PitStone, Crushed/BrokenProducer
Moore QuarryStone, Crushed/BrokenPast Producer
Morro Rock QuarryStone, Crushed/BrokenProducer
Mountain Springs QuarryStone, Crushed/BrokenProducer
Oceano Sand PitStone, Crushed/BrokenProducer
Parker Red Rock PitStone, Crushed/BrokenProducer
Rancho San Simeon PitStone, Crushed/BrokenProducer
Red Rock PitStone, Crushed/BrokenProducer
Rocky Canyon QuarryStone, Crushed/BrokenProducer
Santa Maria Rock CompanyStone, Crushed/BrokenPast Producer
Santa Rita Stone QuarryStone, Crushed/BrokenProducer
Unnamed QuarryStone, Crushed/BrokenPast Producer
Unnamed QuarryStone, Crushed/BrokenPast Producer
Unnamed QuarryStone, Crushed/BrokenPast Producer
Unnamed QuarryStone, Crushed/BrokenPast Producer
Unnamed QuarryStone, Crushed/BrokenPast Producer
Unnamed QuarryStone, Crushed/BrokenPast Producer
Whale Rock PitStone, Crushed/BrokenProducer
Alpha ClaimCopperProspect
Barbara ClaimCopperProspect
Big Bend ClaimCopperProspect
Bonanza GroupCopperOccurrence
Bonanza GroupCopperProspect
First Chance MineCopperProspect
First Chance MineCopperProspect
FlorenceCopperOccurrence
Florence ClaimCopperProspect
GuerroCopperOccurrenceVein
GuerroCopperProspect
Hazzard GroupCopperOccurrence
Hazzard GroupCopperUnknown
Little Bend GroupCopperOccurrence
Little Bend GroupCopperProspect
Lucky Jack GroupCopperProspect
North Star ClaimsCopperProspect
Prodigal SonCopperProspect
RefugioCopperOccurrenceVein
Refugio ClaimCopperUnknown
Schneider & Mccles ClaimCopperProspect
Schweider and McclesCopperOccurrence
Silver SwanCopperPast ProducerUnderground
Silver SwanCopperPast Producer
Take A Chance GroupCopperUnknown
Barneberg MineManganesePast Producer1918
Black Mountain ProspectManganeseOccurrence
Black Mountain ProspectManganeseProspect1918
Bluebird MineManganeseProducer
Bluebird MineManganesePast Producer1918
Egenes DepositManganeseOccurrence
Egenes ProspectManganeseOccurrence1942
Evans Manganese ProspectsManganeseOccurrence
Evans ProspectsManganeseProspect1918
Hearst Ranch - Marmelejo Creek DepositManganeseOccurrenceRhodochrosite
Hearst Ranch - Red Rock DepositManganeseProducerResidual
Hearst Ranch-Marmolejo Cr. DepositManganeseOccurrence1942
Hearst Ranch-Red Rock DepositManganesePast Producer1942
Hill ProspectManganeseOccurrence
Hill ProspectManganeseUnknown
Hobson ClaimsManganeseOccurrence
Isom ProspectManganeseOccurrence
Jobe Ranch MineManganeseProducerHausmannite
Kester ProspectManganeseOccurrence
Kester ProspectManganeseOccurrence
Lanscioni ProspectManganeseOccurrence
Lanscioni ProspectManganeseOccurrence1918
Marquart ProspectManganeseOccurrence
Marquart ProspectManganeseOccurrence1918
Mayfield ProspectManganeseOccurrence
Mayfield ProspectManganeseOccurrence1918
Mello ProspectsManganeseOccurrence
Mello ProspectsManganesePast Producer1942
Morro Bay DepositManganeseOccurrence
Morro Bay ProspectManganeseProspect1942
Muscio ProspectManganeseProducer
Muscio ProspectManganesePast Producer1935
O'Connor Ranch DepositsManganeseProducerRhodochrosite
O'Connor Ranch MineManganesePast Producer1917
Phelan ProspectManganeseOccurrence
Phelan ProspectManganeseOccurrence1918
Prefumo Canyon ProspectsManganeseOccurrence
Ricioli ProspectManganeseOccurrence
Serrano ProspectManganeseOccurrence
Serrano ProspectManganeseProspect1942
Staneuche MineManganeseProducer
Thompson DepositManganeseProducer
Tobacco Creek ProspectManganeseOccurrence
Tobacco Creek ProspectManganeseOccurrence1918
Unnamed Manganese OccurrenceManganeseOccurrence
Unnamed Manganese OccurrenceManganeseOccurrence
Vollmer ProspectManganeseOccurrence
Vollmer ProspectManganeseProspect1918
Welch MineManganeseProducerHausmannite
Welch MineManganesePast Producer1918
Young DepositManganeseProducer
BuckeyeMercuryPast ProducerCinnabar
Buckeye MineMercuryProspect
Buena VistaMercuryProducer
Buena VistaMercuryPlantUnderground
CambriaMercuryPast Producer1903
Cambria MineMercuryPast Producer
Capitola MineMercuryProspect
Cypress MountainMercuryOccurrence1900
Cypress Mountain GroupMercuryProspect
Deer TrailMercuryPast Producer1915
Deer Trail MineMercuryPast Producer
DotyMercuryPast Producer1905
Doty MineMercuryProspect
Elizabeth and Winona GroupMercuryUnknown
Fine EnterprisesMercuryProspect
Fitzhugh RanchMercuryPast Producer1915
Fitzhugh Ranch MineMercuryProspect
Gambrie MineMercuryProducer
Gemstone Nos. 1, 2, & 3MercuryProducer
Gemstone Nos. 1, 2, & 3MercuryProspect
HamiltonMercuryPast Producer1915
Hamilton MineMercuryPast Producer
Josephine GroupMercuryPast Producer1862
KeystoneMercuryPast Producer1875
Keystone MineMercuryPast Producer
KismetMercuryOccurrence1925
Kismet GroupMercuryProspect
Klau MineMercuryPast Producer1868, 1874
La LibertadMercuryProducer1901
La Libertad MineMercuryPast Producer
Little AlmadenMercuryPast ProducerCinnabar
Little Almaden MineMercuryProspect
Little BonanzaMercuryPast Producer1862
Little Bonanza MineMercuryProducer
Little Bonanza MineMercuryPast Producer1862
MadroneMercuryPast Producer1900
Madrone MineMercuryProspect
MahoneyMercuryProducer1874
MarquartMercuryOccurrence1917
Mercury Belle MineMercuryProspect
North StarMercuryUnknown
North Star and Sunset ViewMercuryOccurrence1875
Ocean ViewMercuryPast ProducerCinnabar
Ocean View MineMercuryProspect
Oceanic MineMercuryPast Producer1865, 1875
Pine MountainMercuryPast Producer1875
Pine Mountain MineMercuryPast Producer1871
Polar StarMercuryPast Producer1870
Polar Star MineMercuryProducer1870
ProspectsMercuryProspect
Quien SabeMercuryPast Producer1905
Quien Sabe MineMercuryProspect
RinconadaMercuryPast Producer1872
Rinconada MineMercuryPast Producer1872
San Jose Valley MineMercuryProducer
San Luis ObispoMercuryProducer
San Luis ObispoMercuryUnknown
Southview ProspectMercuryProspect
Sunset View MineMercuryUnknown
TamneyMercuryOccurrenceCinnabar
Unnamed ProspectMercuryProspect
Unnamed ProspectMercuryProspect
Unnamed ProspectMercuryProspect
Unnamed ProspectsMercuryProspect
VultureMercuryPast Producer1915
Vulture MineMercuryProspect
WarrenMercuryOccurrenceCinnabar
Warren ProspectMercuryProspect
Warren Ranch DepositMercuryProspect
William TellMercuryOccurrence1900
William Tell MineMercuryProspect
WilliamsMercuryOccurrence1915
Williams ProspectMercuryProspect
Wittenberg MineMercuryProspect
Wittenberg RanchMercuryPast Producer1900
12th Street PitSand and Gravel, ConstructionProducer
Borrow PitSand and Gravel, ConstructionPast Producer
Borrow PitSand and Gravel, ConstructionPast Producer
Borrow PitSand and Gravel, ConstructionPast Producer
Borrow PitSand and Gravel, ConstructionPast Producer
Borrow PitSand and Gravel, ConstructionPast Producer
Branch PitSand and Gravel, ConstructionProducer
Dana Ranch PitSand and Gravel, ConstructionProducer
Dirtman PitSand and Gravel, ConstructionProducer
Domechini PitSand and Gravel, ConstructionProducer
Estrella PitSand and Gravel, ConstructionProducer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitSand and Gravel, ConstructionPast Producer
Gravel PitsSand and Gravel, ConstructionPast Producer
Gravel PitsSand and Gravel, ConstructionPast Producer
Guiton Molding SandSand and Gravel, ConstructionPast Producer
Huasna River PitSand and Gravel, ConstructionProducer
Miller PitSand and Gravel, ConstructionProducer
Miller Sand PitSand and Gravel, ConstructionProducer
Munari Salinas River PitSand and Gravel, ConstructionProducer
Navaho Sand PitSand and Gravel, ConstructionPast Producer
Navajo Creek PitSand and Gravel, ConstructionProducer
Nicholson Red Rock PitSand and Gravel, ConstructionPast Producer
North River Road PitSand and Gravel, ConstructionProducer
Oceano Beach Foundry SandSand and Gravel, ConstructionPast Producer
Oceano Sand PitSand and Gravel, ConstructionProducer
Ormond Road PitSand and Gravel, ConstructionProducer
Pacific Coast Coal CompanySand and Gravel, ConstructionPast Producer
Paso Pit and MillSand and Gravel, ConstructionPast Producer
Patchett PitSand and Gravel, ConstructionProducer
Pioneer Transit MixSand and Gravel, ConstructionPast Producer
Porter PitSand and Gravel, ConstructionProducer
San Simeon Creek Pit & MillSand and Gravel, ConstructionPast Producer
San Simeon Creek PitsSand and Gravel, ConstructionPast Producer
Sand PitSand and Gravel, ConstructionPast Producer
Sand PitsSand and Gravel, ConstructionPast Producer
SandpitSand and Gravel, ConstructionPast Producer
SandpitSand and Gravel, ConstructionPast Producer
Santa Maria Pit and MillSand and Gravel, ConstructionPast Producer
Santa Maria River PitSand and Gravel, ConstructionProducer
Santa Maria River PitSand and Gravel, ConstructionProducer
Santa Maria River PitSand and Gravel, ConstructionProducer
Slash Bar G Ranch PitSand and Gravel, ConstructionProducer
Sycamore Road PitSand and Gravel, ConstructionProducer
Templeton Pit and MillSand and Gravel, ConstructionPast Producer
Tiber Canyon Sand PitSand and Gravel, ConstructionProducer
Unnamed DepositSand and Gravel, ConstructionPast Producer
Unnamed DepositSand and Gravel, ConstructionProspect
Unnamed DepositSand and Gravel, ConstructionProspect
Unnamed PitSand and Gravel, ConstructionPast Producer
Unnamed PitsSand and Gravel, ConstructionPast Producer
Unnamed PitsSand and Gravel, ConstructionPast Producer
Unnamed QuarrySand and Gravel, ConstructionPast Producer
Unnamed QuarrySand and Gravel, ConstructionPast Producer
Alfred H. Ruedy ChromeChromiumProspect
Captain ClaimChromiumProspect
Captian DepositChromiumProducerChromite
Castro MineChromiumPast Producer1875, 1876, 1957
Castro MineChromiumProducer
Castro MineChromiumPast Producer1876, 1918
Castro Mine-Trinidad MineChromiumProducer
Castro No. 2 ClaimChromiumProspect
Central ClaimsChromiumProspect
Central Claims, Seeley GroupChromiumPast ProducerChromite
Chorro MineChromiumProducer
Chorro MineChromiumPast Producer
Chromic Acid No. 1 ClaimChromiumOccurrenceChromite
Chromic Acid No. 1 ClaimChromiumProspect
Chromic Acid No. 2ChromiumProspect
Chromic Acid No. 2 ClaimChromiumPast ProducerChromite
Cienaga MineChromiumProducerChromite
Cienaga MineChromiumProspect
Colonel ClaimChromiumPast Producer
Colonel DepositChromiumProducerChromite
Colorado MineChromiumPast Producer1880
Colorado MineChromiumPast Producer
Crown Point ClaimChromiumProspect
Crown Point Claim, Seeley GroupChromiumPast ProducerChromite
Cypress Chrome ProspectChromiumProspect
Cypress Prospect, Pick and Shovel GroupChromiumOccurrenceChromite
Eagle ClaimChromiumProducerChromite
Eagle ProspectChromiumProspect
El DivisaderoChromiumProducer1918
El Divisadero MineChromiumPast Producer
El Prinero MineChromiumProducer
El Salto MineChromiumProducer1880, 1918
El Salto MineChromiumPast Producer
Estrella MineChromiumPast Producer
Eucalyptus No 1 ClaimChromiumProducer
Eucalyptus No. 1 ClaimChromiumProspect
Eucalyptus No. 2ChromiumPast Producer
Eucalyptus No. 2 DepositChromiumOccurrenceChromite
Eureka ClaimChromiumOccurrenceChromite
Eureka ClaimChromiumProspect
Evans Ranch DepositChromiumOccurrence
Fitzhugh Ranch DepositsChromiumProspect
Froom Ranch DepositChromiumProspect
Goldtree Vineyard MineChromiumPast Producer
Hard Face Chromite MineChromiumPast Producer
Hilltop ClaimChromiumOccurrenceChromite
Hilltop ClaimChromiumProspect
James Wheeler ClaimsChromiumProspect
Jasper ClaimChromiumOccurrenceChromite
Jasper ClaimChromiumUnknown
Jitney MineChromiumProducer
Jitney MineChromiumProspect
Johe Ranch DepositChromiumOccurrence
Johnson Ranch DepositChromiumProducer
Johnson Ranch DepositChromiumPast Producer
La PrimeraChromiumPast Producer1885, 1958
La PrimeraChromiumPast Producer1890
Laflor ClaimChromiumOccurrenceChromite
Laflor ClaimChromiumProspect
Leitner ClaimChromiumProducerChromite
Leitner ClaimChromiumPast Producer
Low Ranch DepositChromiumPast ProducerChromite
Low Ranch DepositChromiumUnknown
Lucky Jake ChromiteChromiumProspect
Lucky Strike MineChromiumPast ProducerChromite
Lucky Strike MineChromiumProducer
Lucky Strike MineChromiumPast Producer
Mable G MineChromiumPast Producer
Mescal MineChromiumPast ProducerChromite
Mescal MineChromiumProspect
Middlecrest Ranch DepositChromiumProducer
Middlemast Ranch DepositChromiumPast Producer
Moonbeam No. 1ChromiumProspect
Moonbeam No. 1 DepositChromiumOccurrenceChromite
Mountain View DepositChromiumOccurrenceChromite
Mountain View DepositChromiumProspect
Mt. Butte Chromite PropertyChromiumOccurrence
Mutual Chrome MineChromiumProspect
NegroheadChromiumPast ProducerChromite
New London MineChromiumPast Producer1882, 1885, 1957
New London MineChromiumProducer
Norcross MineChromiumPast Producer1915, 1958
Norcross MineChromiumProducer
Norcross MineChromiumPast Producer1875, 1917
Ocean View DepositChromiumProspect
Ore Bag ClaimChromiumOccurrenceChromite
Ore Bag ClaimChromiumProspect
Outpost ClaimsChromiumPast ProducerChromite
Peppard Ranch DepositChromiumOccurrence
Pereira ClaimsChromiumProspect
Pereira Group ClaimsChromiumProducer1918
Pick & Shovel MineChromiumProducer
Pick and Shovel MineChromiumPast Producer1885, 1958
Pine Mountain ClaimsChromiumProducer
Pine Mountain ClaimsChromiumPast Producer
Porta Bros. Ranch DepositChromiumOccurrence
Porta Brothers Ranch ClaimsChromiumOccurrenceChromite
Rancho Piedra Blanca OccurrenceChromiumOccurrenceChromite
Rancho Santa RitaChromiumPast Producer
Rawhide Occurrence, Pick and Shovel GroupChromiumPast ProducerChromite
Rawhide ProspectChromiumPast Producer
RodillaChromiumProspect
Rodilla OccurrenceChromiumOccurrenceChromite
Rogers Ranch OccurrenceChromiumOccurrenceChromite
Rogers San Carpojaro Creek DepositsChromiumOccurrenceChromite
Rogers San Carpojaro Creek DepositsChromiumOccurrence
Russ DepositChromiumOccurrenceChromite
Russ DepositChromiumUnknown
San Carpojaro Creek DepositsChromiumOccurrenceChromite
San Carpojaro Creek DepositsChromiumProspect
Santa Clara DepositChromiumOccurrenceChromite
Santa Clara DepositChromiumProspect
Seeley GroupChromiumPast Producer1885, 1955
Single Jack MineChromiumProducer
Single Jack MineChromiumPast Producer
Sousa Ranch DepositChromiumPast Producer
Spring Creek ChromeChromiumProspect
Starlight ClaimChromiumProspect
Starlight OccurrenceChromiumOccurrenceChromite
Steele Ranch DepositChromiumProspect
Sunrise No. 1ChromiumProspect
Sunrise No. 3ChromiumProspect
Sunrise Nos. 1 and 2 DepositsChromiumOccurrenceChromite
Sunshine ClaimChromiumProducer
Sunshine ClaimsChromiumProspect
Sweetwater Chromite MineChromiumPast Producer1880, 1917
Tip TopChromiumProspect
Tip Top Deposit, Sweetwater-Norcross GroupChromiumPast ProducerChromite
Trinidad MineChromiumPast Producer1885, 1958
Trinidad MineChromiumProducer
Trinidad MineChromiumPast Producer1880
UnknownChromiumOccurrenceChromite
Unnamed MineChromiumProspect
Unnamed MineChromiumProspect
Unnamed PropertyChromiumProspect
Unnamed ProspectChromiumProspect
Victory No. 3ChromiumUnknown
Victory No. 3, Sweetwater-Norcross GroupChromiumPast ProducerChromite
Vulture OccurrenceChromiumPast ProducerChromite
Welch Ranch DepositChromiumProspect
Welch Ranch OccurrenceChromiumOccurrenceChromite
West Norcross MineChromiumPast ProducerChromite
Zerfing Ranch DepositChromiumPast ProducerChromite
Zerfing Ranch DepositChromiumPast Producer

Every populated place in the county

102

Named settlements recorded in the Geographic Names Information System, each with the topographic sheets covering it. Villages, hamlets and abandoned places alike. Each is shown with the nearest named watercourse or landform and the survey quadrangle it falls on.

The vanished settlements of San Luis Obispo County: the places named above that are no longer on the map.

Provenance

  • Topographic sheets. USGS Historical Topographic Map Collection, county index, measured from the bulk metadata.
  • Fire insurance maps. Library of Congress Sanborn collection, faceted to this county.
  • Photographs. Each place queried individually against the Library of Congress Prints and Photographs search.
  • Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
  • Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
  • Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.