Coolidge Springs, California

The same ground, surveyed 78 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1904 1982

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.

• 1904 USGS Indio quadrangle1:125000, 7 printings
• 1931 USGS Vallecito quadrangle1:125000
• 1942 USGS Agua Dulce quadrangle1:62500
• 1943 USGS Vallecito quadrangle1:125000
• 1944 USGS Agua Dulce quadrangle1:62500
• 1947 USGS Agua Dulce quadrangle1:62500
• 1947 USGS Santa Ana quadrangle1:250000
• 1949 USGS Santa Ana quadrangle1:250000
• 1952 USGS Agua Dulce quadrangle1:62500
• 1956 USGS Oasis quadrangle1:24000, 3 printings
• 1956 USGS Santa Ana quadrangle1:250000
• 1959 USGS Rabbit Peak quadrangle1:62500, 2 printings
• 1959 USGS Santa Ana quadrangle1:250000, 3 printings
• 1960 USGS Santa Ana quadrangle1:250000, 2 printings
• 1965 USGS Santa Ana quadrangle1:250000
• 1982 USGS Borrego Valley quadrangle1:100000, 2 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 19 fires within 5 miles of Coolidge Springs between 1996 and 2018, burning about 16 acres in total. None started naturally. 1 was 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:

• Desert Shores
• Salton Sea Beach

Every fire recorded in Imperial County

Regional context, not property-specific evidence. The federal mineral resources record lists 7 workings within 5 miles of Coolidge Springs: 2 past producers, 2 producers, 2 occurrences, 1 prospect. 2 still produce. What was taken out: Sand and Gravel, Construction, Limestone, General, Gold. 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 Imperial 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 1660508. 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.