Illinois Ridge
Ridge in Powell County, Montana · on the USGS Ophir Creek quadrangle
46.68867, -112.55232
Maps that show Illinois Ridge
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Ophir Creek, MT
USGS topo, 2024
Avon, MT
USGS historical 15-minute topo (1958)
Divide, North Half Over-Snow Vehicle Use Map (sheet)
Helena-Lewis and Clark National Forest (2019)
Travel Map East
BLM Montana / Dakotas (2020)
North West Over-Snow Vehicle Use Map
Beaverhead-Deerlodge National Forest
Helena and Townsend Ranger Districts Over-Snow Vehicle Use Map
Helena-Lewis and Clark National Forest (2019)
IFR Enroute Low Altitude Chart L-13 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-01 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-01 (Alaska)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).