From the record
“Hole in the Rock is a narrow and steep crevice in the western rim of Glen Canyon, in southern Utah in the western United States. Together with another canyon on the eastern side of the Colorado River, it provided a route through what would otherwise be a large area of impassable terrain.”
Wikipedia article Hole in the Rock (rock formation), CC BY-SA 4.0.
One of 13 National Register listings published here for Kane County · listed in 1975 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service