Observatory Hill
Summit in Mendocino County, California · on the USGS Mathison Peak quadrangle
39.34108, -123.72070
Maps that show Observatory Hill
Get them in the map app
Mathison Peak, CA — USGS 7.5-minute topo (2021)
USGS Topo Maps (public domain) · California
Public domain
Comptche, CA — USGS historical 15-minute topo (1960)
USGS Historical Topo Maps (public domain) · California
Public domain
Glenblair, CA — USGS historical 15-minute topo (1920)
USGS Historical Topo Maps (public domain) · California
Public domain
Glenblair, CA — USGS historical 15-minute topo (1943)
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
Name, class, county and location: USGS Geographic Names Information System (public domain).