Sulphur Spring (historical)
Spring in Lake County, California · on the USGS Benmore Canyon quadrangle
39.08795, -122.52637
Maps that show Sulphur Spring (historical)
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Benmore Canyon, CA — USGS 7.5-minute topo (2021)
USGS Topo Maps (public domain) · California
Public domain
Bartlett Springs, CA — USGS historical 15-minute topo (1924)
USGS Historical Topo Maps (public domain) · California
Public domain
Bartlett Springs, CA — USGS historical 15-minute topo (1942)
USGS Historical Topo Maps (public domain) · California
Public domain
Bartlett Springs, CA — USGS historical 15-minute topo (1944)
USGS Historical Topo Maps (public domain) · California
Public domain
Clearlake Oaks, CA — USGS historical 15-minute topo (1960)
USGS Historical Topo Maps (public domain) · California
Public domain
Indian Valley 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).