Sulphur Valley
Basin in Humboldt County, California · on the USGS Dinsmore quadrangle
40.46486, -123.61781
Maps that show Sulphur Valley
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Dinsmore, CA — USGS 7.5-minute topo (2022)
USGS Topo Maps (public domain) · California
Public domain
Blocksburg, CA — USGS historical 15-minute topo (1949)
USGS Historical Topo Maps (public domain) · California
Public domain
Blocksburg, CA — USGS historical 15-minute topo (1951)
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 High Altitude Chart H-03 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute High Altitude Chart H-01 (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).