Jay Reservoir   Be the first to submit input for Jay Reservoir. If you have info on Jay Reservoir, Carter County, Montana please submit it here to improve this web site.          These outdoors activities are available near Jay Reservoir.   Public Lands Near Jay Reservoir: Medicine Rocks State Park, Montana, 25 miles away Devils Tower National Monument, Devils Tower - WY, 62 miles away   Camp Grounds Near Jay Reservoir: Lantis Spring Campground, Carter County, 6 miles away   Ski Areas Near Jay Reservoir: Terry Peak, South Dakota, 69 miles away       1100 foot drop, 6 lifts, 24 runs