Mallard Lake
Reservoir in Corson County, South Dakota · on the USGS Hump Butte quadrangle
45.89547, -101.49297
Maps that show Mallard Lake
Get them in the map app
Hump Butte, SD-ND
Detailed map of terrain, trails and roads
USGS topo, 2021
Watauga
Forest Service topo with road numbers
Forest Service FSTopo 7.5-minute quad
Cedar River National Grassland, Dakota Prairie Grasslands
Forest Service forest map
Cedar River National Grassland Motor Vehicle Use Map (MVUM) (2025)
Forest roads and trails open to vehicles
Forest Service Maps · Dakota Prairie Grasslands
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).