Clay Reservoir   Be the first to submit input for Clay Reservoir. If you have info on Clay Reservoir, Powder River County, Montana please submit it here to improve this web site.          These outdoors activities are available near Clay Reservoir.   Hotels Near Clay Reservoir: Best Western Tower West Lodge, Gillette, 49 miles away Hampton Inn Gillette, Gillette, 49 miles away Super 8 Gillette, Gillette, 49 miles away Comfort Inn & Suites, Gillette, 49 miles away