Union Pass (9,212ft/2,808 m) sits on the Continental Divide where waters may flow toward the Mississippi, Columbia, or Colorado Rivers. For centuries, the pass has served as a critical travel route for many tribes including the Shoshone, Arapaho, Gros Ventre, Nez Perce, Crow, and others, who used it as a corridor between river valleys, hunting grounds, and seasonal gathering areas. Surrounded by the Wind River and Gros Ventre mountains, this remote high-country pass offers sweeping alpine vistas and access to wildlife and rugged backcountry terrain. The pass was given its name by U.S. Army Captain William F. Raynolds, who was led through the pass by mountain man and guide Jim Bridger, in the run up to the Civil War in 1860.