2011 Map of Upper Glaston Lake

About this map

Upper Glaston Lake and Lower Glaston Lake anchor this portion of Sweet Grass County, reflecting a landscape defined by water management and high-plains drainage. In this 2011 survey, the intricate network of Sweet Grass Creek and its tributaries, including Cayuse Creek and Dead Beaver Creek, illustrates the hydraulic layout of the region. The presence of engineering works like the Lake Adam North Dam, Lake Adam East Dam, and Lake Adam West Dam suggests the importance of water storage in this ranching or agricultural environment. Further north, the appearance of Cottonwood Springs and the winding course of Rock Creek highlight natural water sources that have likely influenced land use and travel patterns since early settlement. Tracing the routes of Otter Creek Rd and Sweetgrass Rd, one can see how the modern road network follows the dictates of the local topography.