2021 Map of Glad Valley NW

About this map

The Grand River National Grassland dominates the northern reaches of this landscape along the border of Corson and Ziebach counties. The terrain is defined by a dendritic network of drainages, where seasonal watercourses like Beef Creek and Twin Butte Creek carve through the high plains. The absence of concentrated town sites reflects the region's character as a managed open range, where land use is dictated by the Public Land Survey System grids of t17n r17e and t17n r18e. Geologists and land managers can trace the winding paths of Tourney Creek and Blue Creek as they navigate the subtle elevation changes of this prairie environment, providing a detailed record of the natural hydrology and early 21st-century boundary delineations in this portion of South Dakota.