Harmon Reservoir   Be the first to submit input for Harmon Reservoir. If you have info on Harmon Reservoir, Roosevelt County, Montana please submit it here to improve this web site.          These outdoors activities are available near Harmon Reservoir.   Hotels Near Harmon Reservoir: Lone Tree Inn, Sidney, 19 miles away Richland Motor Inn, Sidney, 19 miles away Marquis Plaza And Suites, Williston, 43 miles away Candlewood Suites WILLISTON, Williston, 43 miles away Microtel Williston, Williston, 44 miles away