Heckman Island (historical)
Island in Humboldt County, California · on the USGS Cannibal Island quadrangle
40.63291, -124.30506
Maps that show Heckman Island (historical)
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Salt River and Cock Robin Island Units Topographic — Eel River Wildlife Area — California CDFW
California CDFW Wildlife Area Maps · California
Public domain
Cannibal Island, CA — USGS 7.5-minute topo (2022)
USGS Topo Maps (public domain) · California
Public domain
Eel River Wildlife Area — California CDFW
California CDFW Wildlife Area Maps · California
Public domain
Cape Fortunas, CA — USGS historical 15-minute topo (1916)
USGS Historical Topo Maps (public domain) · California
Public domain
Ferndale, CA — USGS historical 15-minute topo (1943)
USGS Historical Topo Maps (public domain) · California
Public domain
Ferndale, CA — USGS historical 15-minute topo (1951)
USGS Historical Topo Maps (public domain) · California
Public domain
Ferndale, CA — USGS historical 15-minute topo (1959)
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).