Porphyry Mountain
Summit in Madison County, Montana · on the USGS Ramshorn Mountain quadrangle
45.47464, -111.94219
Maps that show Porphyry Mountain
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Ramshorn Mountain, MT
USGS topo, 2024
Virginia City, MT
USGS historical 15-minute topo (1950)
Tobacco Root Mountains Motor Vehicle Use Map (MVUM)
Beaverhead-Deerlodge National Forest (2017)
Central East Over-Snow Vehicle Use Map
Beaverhead-Deerlodge National Forest
IFR Enroute Low Altitude Chart L-11 (U.S.)
FAA, 2026-10-29
IFR Enroute Low Altitude Chart L-13 (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
IFR Enroute Low Altitude Chart L-01 (Alaska)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).