Blackrock, California

The same ground, surveyed 87 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1907 1994

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.

• 1907 USGS Mt. Whitney quadrangle1:125000, 10 printings
• 1919 USGS Mt. Whitney quadrangle1:125000
• 1937 USGS Mt. Whitney quadrangle1:125000, 3 printings
• 1948 USGS Fresno quadrangle1:250000
• 1951 USGS Independence quadrangle1:62500, 4 printings
• 1955 USGS Fresno quadrangle1:250000
• 1956 USGS Fresno quadrangle1:250000
• 1958 USGS Fresno quadrangle1:250000
• 1960 USGS Fresno quadrangle1:250000, 2 printings
• 1962 USGS Fresno quadrangle1:250000, 3 printings
• 1966 USGS Fresno quadrangle1:250000
• 1978 USGS Mount Whitney quadrangle1:100000
• 1982 USGS Blackrock quadrangle1:24000, 2 printings
• 1992 USGS Blackrock quadrangle1:24000
• 1994 USGS Blackrock quadrangle1:24000, 2 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 39 fires within 5 miles of Blackrock between 1992 and 2017, burning about 8,623 acres in total. 12 started naturally. None 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:

• Aberdeen
• Chrysopolis (historical)
• Manzanar
• Reward
• Seven Pines
• Talus

Every fire recorded in Inyo County

Regional context, not property-specific evidence. The federal mineral resources record lists 13 workings within 5 miles of Blackrock: 10 prospects, 2 past producers, 1 occurrence. None of them still produces. What was taken out: Gold, Copper, Silver, Copper, 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 Inyo 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 1667212. 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.