This SRMA extends along the Colorado River from the Colorado State Line to Castle Creek (near the Castle Valley turnoff on Utah Highway 128), and along the Dolores River from the Colorado State line to its confluence with the Colorado River. The SRMA includes Westwater Canyon of the Colorado River, and the Westwater Ranger Station. The SRMA includes 24,124 public land acres. Major activities include boating and camping. Note that this area overlaps the eastern portion of the area known as the Colorado Riverway.