Rio Dell, California

The same ground, surveyed 60 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1935 1995

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.

• 1935 USGS Sebastopol quadrangle1:48000
• 1942 USGS Sebastopol quadrangle1:62500, 3 printings
• 1947 USGS Santa Rosa quadrangle1:250000
• 1949 USGS Santa Rosa quadrangle1:250000, 2 printings
• 1954 USGS Camp Meeker quadrangle1:24000, 5 printings
• 1954 USGS Sebastopol quadrangle1:62500
• 1958 USGS Santa Rosa quadrangle1:250000, 3 printings
• 1962 USGS Santa Rosa quadrangle1:250000
• 1964 USGS Santa Rosa quadrangle1:250000
• 1983 USGS Napa quadrangle1:100000
• 1995 USGS Camp Meeker quadrangle1:24000

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 323 fires within 5 miles of Rio Dell between 1992 and 2020, burning about 240 acres in total. 4 started naturally. 29 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:

• Mirabel Heights
• Mirabel Park
• Mount Jackson
• Forest Hills
• Forestville
• Hacienda

Every fire recorded in Sonoma County

Regional context, not property-specific evidence. The federal mineral resources record lists 42 workings within 5 miles of Rio Dell: 15 occurrences, 14 unknowns, 10 producers, 3 past producers. 10 still produce. What was taken out: Sand and Gravel, Construction, Mercury, Stone, Stone, Crushed/Broken. 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 Sonoma 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 1659789. 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.