O'Brien Mountain
Summit in Shasta County, California · on the USGS O'Brien quadrangle
40.80344, -122.33934
Maps that show O'Brien Mountain
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O'Brien, CA — USGS 7.5-minute topo (2022)
USGS Topo Maps (public domain) · California
Public domain
Lamoine, CA — USGS historical 15-minute topo (1946)
USGS Historical Topo Maps (public domain) · California
Public domain
Lamoine, CA — USGS historical 15-minute topo (1957)
USGS Historical Topo Maps (public domain) · California
Public domain
Lamoine, CA — USGS historical 15-minute topo (1969)
USGS Historical Topo Maps (public domain) · California
Public domain
OSVUM — Lassen National Forest (2023)
Forest Service Maps (public domain) · Lassen National Forest
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-11 (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).