Fir Root Spring
Spring in Trinity County, California · on the USGS Halfway Ridge quadrangle
40.59375, -123.36142
Maps that show Fir Root Spring
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Halfway Ridge, CA — USGS 7.5-minute topo (2021)
USGS Topo Maps (public domain) · California
Public domain
Hyampom, 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
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Name, class, county and location: USGS Geographic Names Information System (public domain).