Corps of Discovery Trail Races

🏃‍♂️Race Overview

St. Louis Track Club is excited to invite everyone to join the Corps of Discovery Trail Races, held on the Lewis & Clark Trails in the beautiful Weldon Spring Conservation Area on August 29, 2026.

Discount for Members: St. Louis Track Club members will automatically receive a $10 discount (use the same email address that you use for your member registration). Not a member? Click here to join.

📍Course Description

• Half-Marathon Distance: Approximately 13.1 miles starting from the Lewis & Clark trailhead in the Weldon Spring Conservation Area off Hwy 94 in Defiance, MO.
• Trail Route: Half marathon participants will first run the 8-mile Lewis Trail followed by the 5-mile Clark Trail.
• Trail Conditions: The course will travel counter-clockwise and will not be closed to outside use. Markings will be provided along the course.
• 5-Mile Loop: This distance will cover one loop of the Clark trail, while the 8-mile option will cover one loop of the Lewis trail.

⏰Race Timing

All distances start at 8:00 a.m.

Half Marathon Course Map

8 mile Course Map

5 mile race Course Map

Swag Deadline: Sign up before August 15th to guarantee swag! All runners registered before this date will receive swag and a finisher's medal.

Sponsor: Thank you to our sponsor Tailwind Nutrition!

🗓️Race Day Details

• CUP FREE: This race is a CUP FREE event. Carry a water receptacle and fill up as needed with water and/or Tailwind.
• PARKING: Parking is in the secondary lot at the Weldon Spring Interpretive Site (7295 RT-94, St. Charles, MO). Follow signs and park where guided.
• PACKET PICK-UP: All racers can pick up their packets near the parking lot and race start line starting at 6:30 am on race morning.
• CUT-OFF TIMES: The cutoff time is 12 p.m., or 4 hours. Runners must start their 5-mile loop by 10:30 am.

📦Logistics and Safety

• DROP BAGS: Drop bag collection area will be at the start/finish area. Mark your bag with your name.
• RACE START: All distances will start and finish at the Lewis and Clark trailhead. 5-mile runners will start at 8 AM, Half Marathon and 8 milers at 8:05 AM.
• AID STATIONS: Different aid station arrangements for each distance will provide water, electrolyte drinks, and snacks throughout the race.
• SAFETY: Be cautious of the roadway when crossing from parking to the race start.