Big Horse Opening
Flat in Mendocino County, California · on the USGS Zeni Ridge quadrangle
38.94879, -123.45918
Maps that show Big Horse Opening
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Zeni Ridge, CA — USGS 7.5-minute topo (2021)
USGS Topo Maps (public domain) · California
Public domain
Ornbaun Valley, CA — USGS historical 15-minute topo (1960)
USGS Historical Topo Maps (public domain) · California
Public domain
Ornbaun, CA — USGS historical 15-minute topo (1943)
USGS Historical Topo Maps (public domain) · California
Public domain
Ornbaun, CA — USGS historical 15-minute topo (1944)
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 Low Altitude Chart L-03 (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
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Name, class, county and location: USGS Geographic Names Information System (public domain).