Keystone Reservoir   Be the first to submit input for Keystone Reservoir. If you have info on Keystone Reservoir, Beaverhead County, Montana please submit it here to improve this web site.          These outdoors activities are available near Keystone Reservoir.   Public Lands Near Keystone Reservoir: Bannack State Park, Montana, 17 miles away Craters Of The Moon National Monument, Arco - ID, 61 miles away   Marinas On or Near Keystone Reservoir: Hunter's Beaverhead Marina and RV, Dillon, 13 miles away   Campgrounds Near Keystone Reservoir: West Cameahwait Campground, Beaverhead County, 11 miles away Hap Hawkins Campground, Beaverhead County, 11 miles away Lonetree Campground, Beaverhead County, 12 miles away Armstead Campground, Beaverhead County, 12 miles away   Hotels Near Keystone Reservoir: Comfort Inn Dillon, Dillon, 33 miles away GuestHouse Inn & Suites Dillon, Dillon, 33 miles away Super 8 Dillon, Dillon, 34 miles away Best Western Paradise Inn, Dillon, 34 miles away   Ski Areas Near Keystone Reservoir: Discovery Ski, Montana, 71 miles away       1670 foot drop, 6 lifts, 48 runs Lost Trail Powder Mountain, Montana, 77 miles away       1800 foot drop, 8 lifts, 45 runs   Whitewater Near Keystone Reservoir: Beaverhead, MadisonCounty, 15 miles away       Class I-III - 21 miles long (Clark Canyon Dam to Dillon)