# Event Details

- **Event Name**: Corps of Discovery Trail Races 5M | 8M | 13.1M
- **Event Start and End Date**: Sat, 29 Aug, 2026 at 08:00 am (-05:00)
- **Event Description**: ***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. ***

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.

Course Description:

The half-marathon course covers approximately 13.1 miles and begin from the Lewis & Clark trailhead in the Weldon Spring Conservation Area off Hwy 94 in Defiance, MO. Half marathon participants will first run the 8-mile Lewis Trail and then the 5-mile Clark Trail. The course will travel counter-clockwise and will not be closed to outside use. There will be markings along the course and a volunteer where the trails split.

The 5-mile distance will cover one loop of the Clark trail and the 8-mile option will cover one loop of the Lewis trail. The trail winds itself along the bluffs of the Missouri River down the hardwood-lined ridges and into the hollows so all participants will have something to enjoy.

All distances start at 8:00 a.m.

Half Marathon Course Map

8 mile Course Map

5 mile race Course Map

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

Thank you to our sponsor Tailwind Nutrition!

Race Day Details:

CUP FREE: This race is a CUP FREE event. This means that there will be NO paper cups at any of the aid stations. Please carry a water receptacle and fill up as needed with water and/or Tailwind, both of which will be available throughout the course.

PARKING: Parking is in the secondary lot at the Weldon Spring Interpretive Site (7295 RT-94, St. Charles, MO). Please follow the signs and park where guided so as to leave room on the main lot for other trail patrons.

PACKET PICK-UP: All racers can pick up their packets near the parking lot and race start line on race morning starting at 6:30 am. 

CUT-OFF TIMES: The cutoff time is 12 p.m., or 4 hours. This is approximately an 18-minute pace per mile. The half marathon course brings runners to the Lewis and Clark trailhead at 8ish miles before heading out to do the final 5-mile loop on Clark. Runners must start their 5-mile loop by 10:30am.

DROP BAGS: We will have a drop bag collection area at the start/finish area. Please mark the bag with your name in case someone has the same one.

RACE START: All distances will start and finish at the Lewis and Clark trailhead. The 5 mile runners will start in quick waves starting at 8 AM and the Half Marathon and 8 milers will start in quick waves at 8:05AM. Since parking is across the roadway at the Weldon Spring site, we will have cones set up to warn drivers and give runners a safe way to be along the roadway. Be sure to pay close attention to the roadway and take caution as you cross.

AID STATIONS: 5 Mile: One manned aid station at mile 3 (water, electrolyte drink, and snacks), plus water and support at the finish line. 8 Mile: An unmanned water-only station around mile 4, and a manned aid station at mile 6.5 (water, electrolyte drink, and snacks). Half Marathon: Runners complete the Lewis loop first, with access to those same stations. They then pass through the start/finish area around mile 8.2 (fully stocked), followed by a final manned station near mile 12 (water, electrolyte drink, and snacks) before returning to the finish.
- **Event URL**: https://allevents.in/defiance/corps-of-discovery-trail-races-5m-|-8m-|-131m/200029688260350
- **Event Categories**: sports, trips-adventures, marathons, workshops
- **Interested Audience**: 
  - total_interested_count: 56

## Ticket Details


## Event venue details

- **city**: Defiance
- **state**: MO
- **country**: United States
- **location**: Lewis And Clark Hiking Trail
- **lat**: 38.675677684176
- **long**: -90.715612364708
- **full address**: Lewis And Clark Hiking Trail, 7400-7498 Missouri 94,Weldon Spring Heights, Missouri, Defiance, United States

## Event gallery

- **Alt text**: Corps of Discovery Trail Races 5M | 8M | 13.1M
  - **Image URL**: https://cdn-az.allevents.in/events5/banners/92e08e3da6efb78dfd5e7fc87d20196e5dd177e39033bff36035046f54b7e7d1-rimg-w1200-h900-dc188ed9-gmir?v=1775856535

## FAQs

- **Q**: When and where is Corps of Discovery Trail Races 5M | 8M | 13.1M being held?
  - **A:** Corps of Discovery Trail Races 5M | 8M | 13.1M takes place on Sat, 29 Aug, 2026 at 08:00 am to Sat, 29 Aug, 2026 at 08:00 am at Lewis And Clark Hiking Trail, 7400-7498 Missouri 94,Weldon Spring Heights, Missouri, Defiance, United States.
- **Q**: Who is organizing Corps of Discovery Trail Races 5M | 8M | 13.1M?
  - **A:** Corps of Discovery Trail Races 5M | 8M | 13.1M is organized by St. Louis Track Club.
- **Q**: Who is this event for? Is it right for me?
  - **A:** Corps of Discovery Trail Races 5M | 8M | 13.1M is ideal for sports fans, athletes, fitness enthusiasts, and anyone who loves the thrill of live competitive action and the energy of a crowd. Whether you're a first-time attendee or a longtime enthusiast in Defiance, this event is thoughtfully curated to deliver a standout experience worth every moment. With 50+ people already showing interest, this is clearly an event worth adding to your calendar - don't miss out.

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