2015 Map of Twomile Lake

About this map

Twomile Lake and a series of numerically named water bodies define this portion of the Coteau des Prairies in northeastern South Dakota. The landscape is characterized by a dense concentration of glacial potholes and sloughs, including Goose Lake, Threemile Lake, and Fourmile Lake, which sit amidst a rigid grid of section-line roads like 430th Ave and 115th St. This 2015 survey reveals how the local topography and hydrology dictate the placement of transportation routes, such as the winding path of CR-5 as it navigates around the margins of Horseshoe Lake and Clubhouse Slough. Historically significant landforms such as Oak Gulch and Parsons Pass provide natural breaks in the elevated plateau. The map details the precise alignment of the Public Land Survey System, showing the townships of t126n r57w and t126n r56w as they divide this water-rich prairie terrain.