Island Mountain
Summit in Okanogan County, Washington · on the USGS Sweetgrass Butte quadrangle
48.65686, -120.26550
Maps that show Island Mountain
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Sweetgrass Butte, WA — USGS 7.5-minute topo (2023)
USGS Topo Maps (public domain) · Washington
Public domain
Mazama, WA — USGS historical 15-minute topo (1962)
USGS Historical Topo Maps (public domain) · Washington
Public domain
IFR Enroute Low Altitude Chart L-01 (U.S.) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
IFR Enroute Low Altitude Chart L-13 (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
IFR Enroute Low Altitude Chart L-01 (Alaska) — FAA, 2026-10-29
FAA IFR Enroute Charts (public domain)
Public domain
Name, class, county and location: USGS Geographic Names Information System (public domain).