Bismark Lake
Reservoir in Custer County, South Dakota · on the USGS Custer quadrangle
43.77606, -103.51505
Maps that show Bismark Lake
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Custer, SD
USGS topo, 2021

Custer, SD
USGS historical 15-minute topo (1956)

Buffalo Gap National Grassland Motor Vehicle Use Map (MVUM), Fall River Ranger District (2020)
Forest Service Maps (public domain) · Nebraska National Forests and Grasslands

IFR Enroute Low Altitude Chart L-12 (U.S.)
FAA, 2026-10-29

IFR Enroute High Altitude Chart H-02 (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-01 (U.S.)
FAA, 2026-10-29
Nearby
Name, class, county and location: USGS Geographic Names Information System (public domain).