Hole in the Rock is a narrow crevice in Glen Canyon that provided a rare passage through otherwise impassable sandstone cliffs to the Colorado River. It became historically significant during the San Juan Expedition of the Church of Jesus Christ of Latter-day Saints, which in 1879 sought a route to a proposed colony in southeastern Utah. After reaching Glen Canyon, the party spent months blasting and carving a wagon road through the crevice. On January 26, 1880, 250 people, 83 wagons, and more than 1,000 livestock began the difficult descent. After crossing the river, the expedition eventually founded Bluff, and traces of that passage still remain in the rock.