Montana State Library Yellowstone River Clearinghouse - Refe
Watershed Reference maps
Map extracted from the "Yellowstone River Cumulative Effects Analysis," (Figure 4-14), US Army Corp of Engineers and the Yellowstone River Conservation District.
https://montana.maps.arcgis.com/home/webmap/viewer.html?webmap=caf56f5cab4d46098d86dad271c43c1c