Grant Reservoir   Be the first to submit input for Grant Reservoir. If you have info on Grant Reservoir, Prairie County, Montana please submit it here to improve this web site.          These outdoors activities are available near Grant Reservoir.   Hotels Near Grant Reservoir: Best Western War Bonnet Inn, Miles City, 26 miles away Sleep Inn & Suites Miles City, Miles City, 26 miles away Econo Lodge Miles City, Miles City, 26 miles away GuestHouse Inn & Suites Miles, Miles City, 26 miles away Super 8 Miles City, Miles City, 26 miles away   Hiking Trails Near Grant Reservoir: Calypso Trail, Prairie County, 13 miles away