- 102 miles (164 km)
- Allow at least 4 hours.
- Fees apply at the BLM campgrounds. Free entry.
The South Big Horn/Red Wall Back Country Byway is a 100-milemostly gravel road that traverses through the antelope-dottedprairies northwest of Casper up into the Big Horn Mountains, andback onto the prairie. The drive starts at the junction of BucknumRoad/County Road 125 and US 20/26 about 15 miles west of Casper,Wyoming.