Government established Walnut Canyon National Monument in 1915 to conserve cliff-dwelling structures constructed between 1125 and 1250 by people of the Sinagua culture along the walls and rim of Walnut Canyon (Clark, 1968).
With a population of over 2, 000 Arizona walnut trees and most exhibiting good health, Walnut Canyon National Monument's namesake species does not appear currently threatened.
Historical review of water flow and riparian vegetation at Walnut Canyon National Monument, Arizona.
Soil survey of Walnut Canyon National Monument, Arizona.