Chimney Rock National Monument May 2026

Chimney Rock is considered a "Chacoan outlier," a satellite community of the vast Chaco Canyon civilization centered in New Mexico, roughly 100 miles to the south. It represents the highest elevation of any known Chacoan site.

Protecting ancient masonry from erosion and freeze-thaw cycles. chimney rock national monument

Designated a national monument on September 21, 2012, by President Barack Obama , Chimney Rock is a site where natural geology and human architecture merge. The monument is defined by two soaring rock pinnacles—Chimney Rock and Companion Rock—which stand nearly 1,000 feet above the valley floor at an elevation of 7,600 feet . Managed by the U.S. Forest Service , it protects hundreds of ruins dating primarily to the Pueblo II period (900–1150 AD). Chimney Rock is considered a "Chacoan outlier," a

A large, subterranean ceremonial chamber used for community gatherings and spiritual rituals. Designated a national monument on September 21, 2012,

Chimney Rock National Monument, located in southwestern Colorado, serves as a vital archaeological and cultural landmark preserving the heritage of the Ancestral Pueblo People. Spanning 4,726 acres within the San Juan National Forest , it is renowned for its high-altitude "Great House" and its role as a sophisticated celestial observatory. This paper explores the site's historical background, its ties to the Chacoan culture, and the rare astronomical alignments that continue to draw researchers and visitors today.