1971 Map of Lucas NW

About this map

Lake Francis Case dominates this landscape along the Missouri River trench, where the 1970s topography shows the impact of the Pick-Sloan Plan on the South Dakota prairie. The map captures the dividing line between Charles Mix, Brule, and Gregory counties, with the Platte Winner Bridge providing a critical connection across the wide waters of the reservoir. To the northeast, the communal settlement of Platte Colony sits above the breaks of the river valley, illustrating the specific social and agricultural patterns of the region. The inclusion of an indefinite boundary and reservation boundary reflects the complex land status common to this reach of the Missouri River. Smaller features like a Flowing Well and Picnic Areas along the shore point to the local water table and the recreational development that followed the damming of the river.