Ysidora, California

The same ground, surveyed 81 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1901 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.

• 1901 USGS San Luis Rey quadrangle1:125000, 8 printings
• 1904 USGS Southern California Sheet No. 2 quadrangle1:250000, 5 printings
• 1941 USGS Margarita Peak quadrangle1:62500
• 1942 USGS Margarita Peak quadrangle1:62500
• 1944 USGS Margarita Peak quadrangle1:62500
• 1944 USGS Morro Hill quadrangle1:31680
• 1947 USGS Santa Ana quadrangle1:250000
• 1948 USGS Morro Hill quadrangle1:24000
• 1949 USGS Morro Hill quadrangle1:24000, 2 printings
• 1949 USGS Santa Ana quadrangle1:250000
• 1954 USGS Margarita Peak quadrangle1:62500
• 1956 USGS Santa Ana quadrangle1:250000
• 1959 USGS Santa Ana quadrangle1:250000, 3 printings
• 1960 USGS Santa Ana quadrangle1:250000, 2 printings
• 1965 USGS Santa Ana quadrangle1:250000
• 1968 USGS Morro Hill quadrangle1:24000, 3 printings
• 1982 USGS Oceanside quadrangle1:100000, 2 printings

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 74 fires within 5 miles of Ysidora (historical) between 1997 and 2020, burning about 5,043 acres in total. None started naturally. 9 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:

• Chappo
• Fallbrook Junction
• Ysidora
• Escondido Junction
• Oceana
• Oceanside

Every fire recorded in San Diego County

Regional context, not property-specific evidence. The federal mineral resources record lists 11 workings within 5 miles of Ysidora (historical): 9 past producers, 2 producers. 2 still produce. What was taken out: Sand and Gravel, Construction, Silica, Stone, Crushed/Broken, Granite. 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.

This settlement is recorded in the Geographic Names Information System as feature 1703678. 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.