Two Rock, California

The same ground, surveyed 48 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1935 1983

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 Sebastopol quadrangle1:62500
• 1954 USGS Two Rock quadrangle1:24000, 3 printings
• 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

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 211 fires within 5 miles of Two Rock between 1992 and 2020, burning about 368 acres in total. 1 started naturally. 6 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:

• Roblar
• Cherry (historical)
• Orchard
• Stony Point
• Washoe
• Woodworth

Every fire recorded in Sonoma County

Regional context, not property-specific evidence. The federal mineral resources record lists 9 workings within 5 miles of Two Rock: 5 producers, 2 past producers, 1 unknown, 1 prospect. 5 still produce. What was taken out: Gold, Stone, Crushed/Broken, Mercury, Stone. 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

Regional context, not property-specific evidence. The National Weather Service names Two Rock in 3 storm reports between 2014 and 2019: 3 flood. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

Every storm 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 1660064. 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.

Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.