Yellowstone National Park’s former main approach from Gardiner, Montana, to park headquarters at Mammoth in Wyoming was the original North Entrance Road and the first major road built in the park. Planned in 1883 by Lieutenant Dan Kingman of the U.S. Army Corps of Engineers and later improved by Captain Hiram M. Chittenden, it linked Fort Yellowstone with the Northern Pacific Railroad station at Gardiner and replaced the older Gardiner High Road. Following the Gardner River for more than five miles, it included the Roosevelt Arch and the site of Yellowstone’s first permanent entrance station. Its history reflects the park’s early transportation system, Army administration, rail access, and river canyon setting.