Johnson Dam
Reservoir in Perkins County, South Dakota · on the USGS Haynes SW quadrangle
45.78125, -102.37597
Maps that show Johnson Dam
Get them in the map app
Haynes SW, SD
Detailed map of terrain, trails and roads
USGS topo, 2021
Haynes SW
Forest Service topo with road numbers
Forest Service FSTopo 7.5-minute quad
Haynes SE
Forest Service topo with road numbers
Forest Service FSTopo 7.5-minute quad
Grand River National Grassland, Dakota Prairie Grasslands
Forest Service forest map
Grand 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
IFR Enroute Low Altitude Chart L-13 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).