2017 Map of Antelope Island

About this map

Lake Sharpe and the Missouri River define the central axis of this landscape, separating the prairie uplands of Hughes and Stanley counties. The water is punctuated by Antelope Island and Farm Island, landmarks that shift the river's flow through this central South Dakota corridor. To the south, the terrain transitions into the expansive Fort Pierre National Grassland, a massive tract of protected prairie that covers the lower half of the map. The settlement of Alto is situated on the eastern edge, near where Mosteller Draw meets the river valley. Numerous drainage features such as Mush Cr, Antelope Cr, and Sand Cr carve through the draws and ridges, including the prominent Royal Ridge. This survey documents a rural landscape where local infrastructure like Antelope Creek Rd and Nystrom Rd provides access through the deeply eroded breaks along the river.