The North Entrance Road Historic District comprises Yellowstone National Park's North Entrance Road from Gardiner, Montana to the park headquarters at Mammoth Hot Springs, Wyoming, a distance of a little over five miles (8 km). The North Entrance Road was the first major road in the park, necessary to join the U.S. Army station at Fort Yellowstone to the Northern Pacific Railroad station at Gardiner. The road includes the Roosevelt Arch at the northern boundary of the park and winds through rolling terrain before crossing the Gardner River and joining the Grand Loop Road.