The Pony Express National Backcountry Byway is a 133-mile gravel road across Utah's West Desert, retracing the historic 1860–1861 mail route between Missouri and California. The byway runs east to west through Tooele and Juab counties, between Lehi (eastern access via SR-73) and Ibapah near the Nevada border, passing reconstructed station sites and BLM-managed conservation lands. The west desert landscape of playa, basin and range, sagebrush, and scattered springs is described by BLM as 'virtually unchanged' from the express era.
The road is maintained gravel and accessible to standard vehicles in dry conditions. The route crosses true backcountry. There is no fuel, water, or cell coverage along most of the 133 miles, and the only developed campground is Simpson Springs, roughly halfway. A high-clearance vehicle is sensible for variable surface conditions; four-wheel drive helps when wet.
