Illinois Basin
Basin in King County, Washington · on the USGS Mount Phelps quadrangle
47.65733, -121.53510
Maps that show Illinois Basin
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Mount Phelps, WA — USGS 7.5-minute topo (2023)
USGS Topo Maps (public domain) · Washington
Public domain
Mount Si, WA — USGS historical 15-minute topo (1960)
USGS Historical Topo Maps (public domain) · Washington
Public domain
Motor Vehicle Use Map — Skykomish Ranger District — Mount Baker-Snoqualmie National Forest (2025)
Forest Service Maps (public domain) · Mount Baker-Snoqualmie National Forest
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
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).