Obregon, California

The same ground, surveyed 94 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1903 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.

• 1903 USGS Yuma quadrangle1:125000, 2 printings
• 1905 USGS Yuma quadrangle1:125000, 5 printings
• 1942 USGS Yuma quadrangle1:250000
• 1953 USGS Ogilby quadrangle1:62500, 2 printings
• 1954 USGS El Centro quadrangle1:250000
• 1955 USGS El Centro quadrangle1:250000
• 1958 USGS El Centro quadrangle1:250000, 4 printings
• 1961 USGS El Centro quadrangle1:250000
• 1963 USGS Ogilby quadrangle1:62500, 2 printings
• 1964 USGS El Centro quadrangle1:250000
• 1988 USGS Ogilby quadrangle1:24000
• 1993 USGS Yuma quadrangle1:100000, 2 printings
• 1997 USGS Ogilby quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 2 fires within 5 miles of Obregon between 2007 and 2009, burning under an acre in total. None 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:

• Cactus
• Ogilby

Every fire recorded in Imperial County

Regional context, not property-specific evidence. The federal mineral resources record lists 74 workings within 5 miles of Obregon: 31 occurrences, 19 past producers, 11 unknowns, 7 producers. 10 still produce. What was taken out: Gold, Kyanite, Mica, Tungsten. 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 1661133. 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.