Porcupine Peak
Summit in Ontonagon County, Michigan · on the USGS Underwood Hill quadrangle
46.68915, -89.84978
Maps that show Porcupine Peak
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Underwood Hill, MI
Detailed map of terrain, trails and roads
USGS topo, 2023
Underwood Hill
Forest Service topo with road numbers
Forest Service FSTopo 7.5-minute quad
Thomaston, MI
Old map for history, not navigation
USGS historical 15-minute topo (1956)
Ottawa National Forest
Forest Service forest map
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-14 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-02 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).