Two companies of United States Cavalry are stationed at Fort Yellowstone, and, during the summer detachments of these troops are placed in different parts of the reservation. Their duties are to patrol the Park, prevent the spreading of forest fires and the commission of acts of vandalism. The troops have authority to make arrests for any violation of Park regulations. Hunting is especially prohibited, and all guns are officially sealed at the entrance to the Park.

The commanding officer at Fort Yellowstone is Acting Superintendent of the reservation. All rules and regulations emanate from the Department of the Interior, and printed copies of them will be found posted in all Park Hotels.

The Government has constructed a system of macadamized roads of easy grade throughout the Park, and these are kept sprinkled daily during the Park season.