2017 Map of Heggs Lake

About this map

Coteau des Prairies, a high glacial plateau, defines the landscape of this Clark County map. This 2017 study illustrates the complex prairie pothole region, where numerous wetlands and named basins like Heggs Lake and Lake Todd dominate the topography. The distribution of these water bodies suggests a region shaped by glacial recession, creating a labyrinth of small lakes and sloughs. Interspersed among these natural features is a grid of section lines and rural routes, including S Dakota Highway 20 and Co Rd 22, which provide the primary access to the scattered agricultural holdings. The map also identifies Pepper Slough, Carson Lake, and Swan Lake, highlighting the critical hydrography of the northeastern South Dakota plains.