Porphyry Peak
Summit in Fergus County, Montana · on the USGS New Year quadrangle
47.21377, -109.26570
Maps that show Porphyry Peak
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New Year, MT
USGS topo, 2024
Lewistown, MT
USGS historical 15-minute topo (1941)
Lewistown, MT
USGS historical 15-minute topo (1944)
Charles M. Russell Wetland Management District Map (2023)
Fish & Wildlife Service Refuge Maps (public domain) · Charles M. Russell Wetland Management District
CMR Wetland Management District map
Charles M. Russell Wetland Management District (2023)
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
Name, class, county and location: USGS Geographic Names Information System (public domain).