Boundary Reservoir   Be the first to submit input for Boundary Reservoir. If you have info on Boundary Reservoir, Powder River County, Montana please submit it here to improve this web site.          These outdoors activities are available near Boundary Reservoir.   Camp Grounds Near Boundary Reservoir: Holiday Campground, Powder River County, 8 miles away   Hotels Near Boundary Reservoir: Holiday Inn Express MILES CITY, Miles City, 41 miles away GuestHouse Inn & Suites Miles, Miles City, 42 miles away Comfort Inn Miles City, Miles City, 42 miles away Super 8 Miles City, Miles City, 42 miles away Econo Lodge Miles City, Miles City, 42 miles away