In 1929, President Herbert C. Hoover set aside Arches as a National Monument. Arches remained a National Monument until September 1969, when President Richard M. Nixon signed a bill making it a National Park.
In the early 1920’s Alexander Ringhoffer, a prospector in southeastern Utah, traveled through the Klondike Bluffs on the Western edge of Salt Valley. He thought such wonders should be seen by many and suggested that representatives of the Denver and Rio Grande Western Railroad visit the area. The railroad men, particularly Frank Wadleigh, the D&RGW’s passenger traffic manager, were so impressed that they contacted Stephen T. Mather, the first director of the National Park Service. Mather was intrigued and pushed for the creation of a national monument. Finally in 1929, President Herbert C. Hoover set aside Arches as a National Monument. Through the years the monument’s size was modified by succeeding presidents: enlarged by Franklin Roosevelt, diminished a bit by Dwight Eisenhower, then doubled by Lyndon Johnson. At last, President Richard Nixon signed into law in 1971, an act establishing Arches as a national park.