River Of No Return Endurance Runs

Event overview

The River of No Return Endurance Runs take place in Challis, Idaho, with the main venue at Challis City Park. The event offers three distances: 108K, 55K, and 32K. The races tour mountain terrain around the Salmon River and nearby historic sites, with multiple aid stations and crew access at designated locations. The event is part of the Idaho Trail Ultra Series. Registration closes on June 1; the refund policy is full refund minus $20 until May 1, 50% refund after May 1, and no refunds after June 1.

Courses and logistics

• 108K - ~17,600' elevation, 9 aid stations, large single-loop.
• 55K - ~8,800' elevation, 5 aid stations, lollipop-type loop.
• 32K - ~4,500' elevation, 2 aid stations, point-to-point to City Park.

The 55K and 108K start and finish at Challis City Park. The 32K starts at the ghost town of Bayhorse and finishes at the City Park; shuttles run to the 32K start. The 108K route includes five significant climbs cresting around 8,000', 9,000', and 10,000' and is mostly two-track with sections of dirt road, single track, and pavement approaching Challis. The 55K route uses narrow ATV trail, dirt road, elk trails, and includes a 3.5 mile descent to Bayhorse and a return via the Lombard Trail. The final mile of all races runs down Main Street Challis into the City Park finish.

Support crews are allowed for the 55K and 108K at specified aid stations; crews are not allowed for the 32K. Visit the organization's website for the most recent information.