Duncan Lake
Lake in Barry County, Michigan · on the USGS Caledonia quadrangle
42.75413, -85.53254
Maps that show Duncan Lake
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Caledonia, MI
Detailed map of terrain, trails and roads
USGS topo, 2023

Grand Rapids, MI
Old map for history, not navigation
USGS historical 15-minute topo (1914)

Grand Rapids, MI
Old map for history, not navigation
USGS historical 15-minute topo (1943)

Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)

IFR Enroute Low Altitude Chart L-28 (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-05 (U.S.)
FAA, 2026-10-29

IFR Enroute High Altitude Chart H-10 (U.S.)
FAA, 2026-10-29

IFR Enroute High Altitude Chart H-12 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).