The Windows of Pollock Canyon, Mesa County, Colorado
Photo by David Kennedy
NABSQNO 12S-688940-4332410. The Windows of Pollock Canyon is a very interesting double fin natural arch eroded through Entrada sandstone. Wall collapse is actively occurring at this stage of its development. Indeed, the southern opening (left, in the photo above) only dates from the winter of 1952. In the near future, these two openings will combine to form a shelter natural arch.
The Windows of Pollock Canyon is located above Pollock Canyon in a BLM wilderness area west of Grand Junction in Mesa County, Colorado. Access requires a permit and directions from the BLM ranger station in Grand Junction. Both openings have spans of about 12 feet. When the openings merge, the resulting arch will have a span of about 50 feet.