Walnut Canyon National Monument is a United States National Monument located about 10 mi (16 km) southeast of downtown Flagstaff, Arizona, near Interstate 40. The canyon rim elevation is 6,690 ft (2,040 m); the canyon's floor is 350 ft lower. A 0.9 mi (1.4 km) long loop trail descends 185 ft (56 m) into the canyon passing 25 cliff dwelling rooms constructed by the Sinagua, a pre-Columbian cultural group that lived in Walnut Canyon from about 1100 to 1250 CE. "
Other contemporary habitations of the Sinagua people are preserved in the nearby Tuzigoot and Montezuma Castle national monuments.The Walnut Canyon site contains Walnut Creek, which carved a 600 foot deep canyon that flows east. The creek joins into the Little Colorado River enroute to the Grand Canyon.
Today a variety of archeological and natural resources are preserved on approximately 3600 acres.Park entrance road, trails, and Visitor Center are open all year, except December 25. From May until October the monument is open from 8:00 a.m. to 5:00 p.m. MST and is open from 9:00 a.m. to 5:00 p.m. MST the remainder of the year. Entry to park trails closes 1 hour before the monument closes.