Hidden Valley Lake
Reservoir in Lake County, California · on the USGS Middletown quadrangle
38.81070, -122.56411
Maps that show Hidden Valley Lake
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Middletown, CA — USGS 7.5-minute topo (2022)
USGS Topo Maps (public domain) · California
Public domain
Lower Lake, CA — USGS historical 15-minute topo (1945)
USGS Historical Topo Maps (public domain) · California
Public domain
Lower Lake, CA — USGS historical 15-minute topo (1958)
USGS Historical Topo Maps (public domain) · California
Public domain
Knoxville Wildlife Area — California CDFW
California CDFW Wildlife Area Maps · 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 Low Altitude Chart L-11 (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
Name, class, county and location: USGS Geographic Names Information System (public domain).