2015 Map of Heggs Lake

About this map

Coteau des Prairies, the vast highland plateau of the northern plains, defines the undulating topography of this Clark County landscape. This 2015 survey reveals a glacial terrain characterized by numerous depressions and wetlands typical of the region's prairie pothole ecosystem. Large water bodies such as Heggs Lake and Swan Lake dominate the northern sections, while Lake Todd and Carson Lake sit alongside Pepper Slough in the central reaches. The area is structured by a rigorous grid of section-line roads, including 430th Ave and 156th St, which reflect the enduring influence of the Public Land Survey System on South Dakota's rural development. This map serves as a precise record of the hydrography and land divisions within the townships of t119n r56w and t118n r56w during the early 21st century.