World Heritage Site - December 8, 1987
Chaco Culture National Historic Park - December 19, 1980
Chaco Canyon National Monument - March 11, 1907
Did You Know?
Chaco Canyon National Monument was established on March 11, 1907. On December
19, 1980, Chaco Canyon National Monument was re-designated Chaco Culture
National Historical Park. An additional 13,000 acres were added to the park.