Tortuga, California

The same ground, surveyed 62 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1940 2002

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.

• 1940 USGS Iris quadrangle1:62500, 4 printings
• 1945 USGS Iris quadrangle1:62500
• 1954 USGS Salton Sea quadrangle1:250000
• 1955 USGS Salton Sea quadrangle1:250000, 2 printings
• 1955 USGS Tortuga quadrangle1:24000, 3 printings
• 1959 USGS Salton Sea quadrangle1:250000, 4 printings
• 1963 USGS Salton Sea quadrangle1:250000
• 1965 USGS Salton Sea quadrangle1:250000
• 1985 USGS Salton Sea quadrangle1:100000, 2 printings
• 1992 USGS Tortuga quadrangle1:24000
• 1998 USGS Tortuga quadrangle1:24000
• 2002 USGS Iris quadrangle1:50000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 6 fires within 5 miles of Tortuga between 2005 and 2017, burning about 522 acres in total. 1 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:

• Iris
• Amos

Every fire recorded in Imperial County

Regional context, not property-specific evidence. The federal mineral resources record lists 3 workings within 5 miles of Tortuga: 2 producers, 1 unknown. 2 still produce. What was taken out: 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 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 252997. 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.