Illinois Pass
Gap in Grand County, Colorado · on the USGS Radial Mountain quadrangle
40.36943, -106.01224
Maps that show Illinois Pass
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Radial Mountain, CO
USGS topo, 2022
Rand, CO
USGS historical 15-minute topo (1956)
Parks Ranger District Motor Vehicle Use Map (MVUM)
Medicine Bow-Routt National Forests & Thunder Basin National Grassland (2018)
IFR Enroute Low Altitude Chart L-10 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-12 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-09 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-05 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-11 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-03 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-01 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).