Hailstone Reservoir   Be the first to submit input for Hailstone Reservoir. If you have info on Hailstone Reservoir, Powder River County, Montana please submit it here to improve this web site.          These outdoors activities are available near Hailstone Reservoir.   Ski Areas Near Hailstone Reservoir: Antelope Butte, Wyoming, 100 miles away       1000 foot drop, 3 lifts, 18 runs