Portage River Harbor of Refuge
Bay in Houghton County, Michigan · on the USGS Portage Entry quadrangle
46.98687, -88.43818
Maps that show Portage River Harbor of Refuge
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Portage Entry, MI
Detailed map of terrain, trails and roads
USGS topo, 2023
Keweenaw Bay, MI
Old map for history, not navigation
USGS historical 15-minute topo (1954)
Park Map - Keweenaw National Historical Park
National Park Service Maps · Keweenaw National Historical Park
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 Low Altitude Chart L-31 (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).