Halcyon Historic District

Listed on the National Register of Historic Places in 2017. 12 historic topographic surveys show this location, the earliest from 1897.

From the record

One of 32 National Register listings published here for San Luis Obispo County · listed in 2017 · category: District.

Sources: the National Register database, National Park Service

The listing

Address. Bounded by Halcyon Rd., The Pike and CA 1/Cienega St., Halcyon, 93420
When was it listed? March 2017
Category. district
Census division. Arroyo Grande
National Register reference number. 100000783 - assigned by the National Park Service when the property was listed.

Fires near this property

432 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 432 fires within 5 miles of Halcyon Historic District between 1992 and 2020, burning about 1,922 acres in total. 4 started naturally. 20 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause	Fires
Missing data/not specified/undetermined	211
Equipment and vehicle use	112
Debris and open burning	31
Misuse of fire by a minor	24
Arson/incendiarism	20
Smoking	15
Power generation/transmission/distribution	7
Recreation and ceremony	7
Natural	4
Other causes	1

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Date	Cause	Size	Reported by	Name on the report
8 September 2009	Missing data/not specified/undetermined	under an acre	California Department of Forestry & Fire Protection	not named
8 September 2007	Arson/incendiarism	1.0 acres	San Luis Obispo Unit	OCEANO DUNES STATE PA 125
8 September 2004	Equipment and vehicle use	under an acre	San Luis Obispo Unit	EWING
6 September 2009	Equipment and vehicle use	1.0 acres	San Luis Obispo Unit	LOS BERROS RD / POMEROY R
5 September 1992	Equipment and vehicle use	under an acre	San Luis Obispo Unit	SLU 2313
4 September 2020	Missing data/not specified/undetermined	1.0 acres	San Luis Obispo Unit	EMS3CDF/
30 September 2020	Power generation/transmission/distribution	under an acre	San Luis Obispo Unit	FAIR OAKS AVE AG
30 September 2001	Missing data/not specified/undetermined	under an acre	San Luis Obispo Unit	SEVADA LN

Every fire recorded in San Luis Obispo County

Mines and quarries near this property

10 of 15 shown

Regional context, not property-specific evidence. The federal mineral resources record lists 15 workings within 5 miles of Halcyon Historic District: 6 past producers, 5 occurrences, 4 producers. 4 still produce. What was taken out: Sand and Gravel, Construction, Stone, Crushed/Broken, Stone, Dimension, Uranium. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status
Arroyo Grande Creek Deposit	Gypsum-Anhydrite	Occurrence
Caen Quarry	Stone, Dimension	Past Producer
Newsome Marl Deposit	Calcium	Occurrence
Owen Group	Uranium	Producer
Unnamed Diatomite Deposit	Diatomite	Occurrence
Unnamed Limestone Deposit	Limestone, General	Occurrence
Unnamed Pumice Occurrence	Pumice	Occurrence
Caen Quarry	Stone, Crushed/Broken	Past Producer
Oceano Sand Pit	Stone, Crushed/Broken	Producer
Gravel Pit	Sand and Gravel, Construction	Past Producer

Every working recorded in San Luis Obispo County

Maps showing this location

12 surveys

United States Geological Survey topographic sheets whose coverage includes this point. Matched by taking the middle of the area the National Park Service maps for this listing, then testing that coordinate against the published boundary of every sheet.

1897 USGS Arroyo Grande quadrangle1:62500 - 5 printings
1900 USGS San Luis quadrangle1:125000 - 4 printings
1942 USGS Arroyo Grande quadrangle1:62500 - 3 printings
1947 USGS San Luis Obispo quadrangle1:250000
1948 USGS San Luis Obispo quadrangle1:250000
1952 USGS Arroyo Grande quadrangle1:62500 - 3 printings
1956 USGS San Luis Obispo quadrangle1:250000 - 5 printings
1957 USGS San Luis Obispo quadrangle1:250000
1958 USGS San Luis Obispo quadrangle1:250000
1965 USGS Oceano quadrangle1:24000 - 2 printings
1979 USGS Oceano quadrangle1:24000
1981 USGS San Luis Obispo quadrangle1:100000 - 3 printings

Listed places nearby

4 within 8 miles

Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.

Property	Distance	Listed
Arroyo Grande IOOF Hall	1.7 miles	1991
John Price House	4.0 miles	1988
Dana Adobe	6.4 miles	1971
Corral de Piedra	6.5 miles	1978

Sources for this property

National Archives record	The nomination case file for reference 100000783 in Record Group 79.
San Luis Obispo County	All 32 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
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.