Sioux Reservoir   Be the first to submit input for Sioux Reservoir. If you have info on Sioux Reservoir, Carter County, Montana please submit it here to improve this web site.          These outdoors activities are available near Sioux Reservoir.   Public Lands Near Sioux Reservoir: Medicine Rocks State Park, Montana, 20 miles away Devils Tower National Monument, Devils Tower - WY, 53 miles away   Camp Grounds Near Sioux Reservoir: Ekalaka Park Campground, Carter County, 7 miles away   Hotels Near Sioux Reservoir: Best Western Devils Tower Inn, Hulett, 48 miles away   Ski Areas Near Sioux Reservoir: Terry Peak, South Dakota, 82 miles away       1100 foot drop, 6 lifts, 24 runs