Thompson Ridge
Ridge in Sonoma County, California · on the USGS Big Foot Mountain quadrangle
38.77121, -123.14268
Maps that show Thompson Ridge
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Big Foot Mountain, CA — USGS 7.5-minute topo (2021)
USGS Topo Maps (public domain) · California
Public domain
Lake Sonoma Wildlife Area — California CDFW
California CDFW Wildlife Area Maps · California
Public domain
Hopland, CA — USGS historical 15-minute topo (1938)
USGS Historical Topo Maps (public domain) · California
Public domain
Hopland, CA — USGS historical 15-minute topo (1943)
USGS Historical Topo Maps (public domain) · California
Public domain
Hopland, CA — USGS historical 15-minute topo (1944)
USGS Historical Topo Maps (public domain) · California
Public domain
Hopland, CA — USGS historical 15-minute topo (1960)
USGS Historical Topo Maps (public domain) · California
Public domain
IFR Enroute Low Altitude Chart L-02 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-03 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-04 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-03 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).