Halcyon, California

The same ground, surveyed 84 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1897 1981

Buildings and businesses the archive holds for this place. Each opens its own page, with the source record it came from.

On the National Register 1 record

• Halcyon Historic Districtlisted 2017

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 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

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 433 fires within 5 miles of Halcyon between 1992 and 2020, burning about 1,924 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.

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

Settlements close enough to share some of these fires:

• Arroyo Grande
• Arroyo Trailer Park
• Grande Mobile Manor Mobile Home Park
• Ken Mar Gardens Mobile Home Park
• Oaks
• Portico Mobile Home and Garden Park

Every fire recorded in San Luis Obispo County

Regional context, not property-specific evidence. The federal mineral resources record lists 17 workings within 5 miles of Halcyon: 7 past producers, 5 producers, 5 occurrences. 5 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.

Every working recorded in San Luis Obispo County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 1660712. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

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.