Four Corners, California

The same ground, surveyed 98 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1897 1995

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 Concord quadrangle1:62500, 6 printings
• 1915 USGS Concord quadrangle1:62500, 5 printings
• 1942 USGS Concord quadrangle1:62500
• 1943 USGS Concord quadrangle1:62500
• 1947 USGS San Francisco quadrangle1:250000
• 1947 USGS Walnut Creek quadrangle1:24000
• 1948 USGS San Francisco quadrangle1:250000
• 1949 USGS Walnut Creek quadrangle1:24000, 2 printings
• 1955 USGS San Francisco quadrangle1:250000
• 1956 USGS San Francisco quadrangle1:250000, 4 printings
• 1957 USGS San Francisco quadrangle1:250000
• 1959 USGS Concord quadrangle1:62500, 2 printings
• 1959 USGS Walnut Creek quadrangle1:24000, 7 printings
• 1960 USGS San Francisco quadrangle1:250000
• 1961 USGS San Francisco quadrangle1:250000
• 1964 USGS San Francisco quadrangle1:250000
• 1971 USGS San Francisco quadrangle1:250000
• 1978 USGS San Francisco quadrangle1:100000, 2 printings
• 1985 USGS San Francisco quadrangle1:250000
• 1993 USGS Walnut Creek quadrangle1:24000
• 1995 USGS Walnut Creek quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 543 fires within 5 miles of Four Corners between 1992 and 2020, burning about 839 acres in total. 3 started naturally. 87 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:

• Meinert
• Bancroft
• Hookston
• Las Juntas
• Contra Costa Centre
• Pleasant Hill

Every fire recorded in Contra Costa County

Regional context, not property-specific evidence. The federal mineral resources record lists 26 workings within 5 miles of Four Corners: 8 occurrences, 6 past producers, 5 producers, 4 prospects. 5 still produce. What was taken out: Stone, Crushed/Broken, Stone, Calcium, Sand and Gravel, Construction. 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 Contra Costa 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 1658569. 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.