Mary Reservoir   Be the first to submit input for Mary Reservoir. If you have info on Mary Reservoir, Johnson County, Wyoming please submit it here to improve this web site.          These outdoors activities are available near Mary Reservoir.   Hotels Near Mary Reservoir: Holiday Inn Express Hotel & Suites BUFFALO, Buffalo, 25 miles away Hampton Inn and Suites Buffalo, WY, Buffalo, 25 miles away Comfort Inn Buffalo, Buffalo, 25 miles away Super 8 Buffalo, Buffalo, 26 miles away Wyo Motel, Buffalo, 26 miles away