McMahons, California

The same ground, surveyed 109 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1891 2000

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.

• 1891 USGS Downieville quadrangle1:125000
• 1893 USGS Downieville quadrangle1:125000
• 1895 USGS Downieville quadrangle1:125000
• 1896 USGS Downieville quadrangle1:125000
• 1897 USGS Downieville quadrangle1:125000, 7 printings
• 1951 USGS Downieville quadrangle1:62500, 3 printings
• 1951 USGS Goodyears Bar quadrangle1:24000, 5 printings
• 1958 USGS Chico quadrangle1:250000, 4 printings
• 1960 USGS Chico quadrangle1:250000
• 1979 USGS Portola quadrangle1:100000, 2 printings
• 2000 USGS Goodyears Bar quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 48 fires within 5 miles of McMahons (historical) between 1992 and 2019, burning about 264 acres in total. 28 started naturally. 1 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:

• Mount Pleasant
• Scales
• Poverty Hill
• Union Hill
• Brandy City
• Cal-Ida

Every fire recorded in Sierra County

Regional context, not property-specific evidence. The federal mineral resources record lists 114 workings within 5 miles of McMahons (historical): 38 occurrences, 34 past producers, 25 producers, 12 unknowns. 25 still produce. What was taken out: Gold, Silver, Chromium, 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 Sierra 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 1701301. 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.