2017 Map of Split Rock Lake

About this map

Split Rock Lake and the engineered waterways of the Pishkun Canal dominate this landscape along the border of Teton and Lewis and Clark Counties. The terrain is defined by dramatic elevation changes, notably the Black Reef and Long Ridge in the northern reaches, where the N Fork Deep Cr and S Fork Deep Cr emerge. The presence of the Pishkun Reservoir and Tunnel Lake reflects the region's managed water resources, while the Sun River winds through the southern portion of the quadrangle. Significant coulees, such as Arnold Coulee and Oxheart Coulee, cut through the plains, offering a detailed look at the drainage patterns and landforms that shaped local ranching and travel routes like Pishkin Rd.