A portion of South Pass (two nearby passes, really) that formed the most-traveled and most-trusted low valley through the fearsome Rocky Mountains for 19th-Century westward emigrants on the Oregon, Mormon, and California trails, which followed much the same route to this point and beyond before diverging, as well as Pony Express riders

Title, date and keywords based on information provided by the photographer.
This was no stroll through a valley for the travelers. The passes themselves lie more than 7,000 feet above sea level in what is now Fremont County in southwestern Wyoming
Credit line: Gates Frontiers Fund Wyoming Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.
Gift; Gates Frontiers Fund; 2015; (DLC/PP-2015:069).
Forms part of: Gates Frontiers Fund Wyoming Collection within the Carol M. Highsmith Archive.