Mortero Palms, California

The same ground, surveyed 66 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1931 1997

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.

• 1931 USGS Carrizo quadrangle1:125000
• 1939 USGS Jacumba quadrangle1:62500, 2 printings
• 1942 USGS Jacumba quadrangle1:62500
• 1950 USGS San Diego quadrangle1:250000
• 1954 USGS San Diego quadrangle1:250000
• 1955 USGS San Diego quadrangle1:250000
• 1958 USGS San Diego quadrangle1:250000, 4 printings
• 1959 USGS Jacumba quadrangle1:62500, 2 printings
• 1959 USGS Jacumba quadrangle1:24000, 4 printings
• 1979 USGS El Cajon quadrangle1:100000, 2 printings
• 1997 USGS Jacumba quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 56 fires within 5 miles of Mortero Palms between 1993 and 2019, burning about 363 acres in total. 3 started naturally. 3 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:

• Dos Cabezas
• Bankhead Springs
• Boulevard
• Titus

Every fire recorded in San Diego County

Regional context, not property-specific evidence. The federal mineral resources record lists 31 workings within 5 miles of Mortero Palms: 13 occurrences, 10 prospects, 4 past producers, 4 producers. 4 still produce. What was taken out: Tungsten, Manganese, Feldspar, Gemstone. 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 Diego 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 1661063. 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.