Horse Killer Reservoir   Be the first to submit input for Horse Killer Reservoir. If you have info on Horse Killer Reservoir, Carter County, Montana please submit it here to improve this web site.          These outdoors activities are available near Horse Killer Reservoir.   Public Lands Near Horse Killer Reservoir: Medicine Rocks State Park, Montana, 22 miles away Devils Tower National Monument, Devils Tower - WY, 66 miles away   Camp Grounds Near Horse Killer Reservoir: Lantis Spring Campground, Carter County, 7 miles away   Ski Areas Near Horse Killer Reservoir: Terry Peak, South Dakota, 73 miles away       1100 foot drop, 6 lifts, 24 runs