2021 Map of Sourdough Flats

About this map

The Belle Fourche River and its numerous tributaries, including Middle Cr and Crow Cr, dominate this section of Butte County. The landscape transitions from the open expanses of Sourdough Flats and Windy Flats into more complex terrain marked by Grummit Canyon and Big Canyon. This 2021 survey illustrates a modern rural infrastructure defined by a network of ranch and access roads, such as Sourdough Rd and Smiley Rd, that weave between the river valley and the higher plateaus. On the southeastern edge, the outskirts of Belle Fourche appear, where Hay Creek Rd and Dorsett Rd signal increasing residential and commercial density. The map reveals how the local hydrology, from Hay Cr to the southern Willow Cr, continues to dictate the placement of transportation routes and property boundaries in this high-plains environment.