Corps of Discovery Trail Races
Saint Charles, United States • 29 Aug 2026
Corps of Discovery Trail Races
The Corps of Discovery Trail Races take place in the Weldon Spring Conservation Area, utilizing the Lewis and Clark Trails. The event starts and finishes at the Lewis and Clark trailhead off Highway 94 in Defiance, Missouri. Participants can choose between three trail distances, each navigating a course that winds along the bluffs of the Missouri River, through hardwood-lined ridges, and into hollows.
Available distances include:
- 13.1 Miles: Covers the 8-mile Lewis loop followed by the 5-mile Clark loop.
- 8 Miles: Consists of one loop on the Lewis Trail.
- 5 Miles: Consists of one loop on the Clark Trail.
Running trails follow a counter-clockwise direction and remain open to the public during the event. Course markings and volunteers are present at trail splits to guide runners. The event has a total time limit of 4 hours for all participants. Half marathon runners must begin their second loop by a designated cutoff time to continue the race.
This is a cup-free event. Aid stations do not provide paper cups, and runners are required to carry their own water receptacles. Stations are located at various intervals along the trails, offering water, electrolyte drinks, and snacks. Parking is located at the Weldon Spring Interpretive Site, which is separated from the starting area by a roadway.
All runners registered by the middle of August receive a finisher's medal and event swag. A drop bag collection area is available near the start and finish line for participant convenience. Visit the organization's website for the most recent information.