Historic Bridge – Defiance loop from Weldon Spring Containment Cell

Mountain biking trails

United States

Missouri

St. Charles County

Historic Bridge – Defiance loop from Weldon Spring Containment Cell

Moderate

3.0

(13)

riders

Historic Bridge – Defiance loop from Weldon Spring Containment Cell

02:44

34.0km

280m

Mountain biking

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Weldon Spring Conservation Area

Katy Trail State Park

Waypoints

Start point

Parking

Get Directions

275 m

Weldon Spring Site

Highlight • Monument

The Weldon Spring Site has an interesting past. They used to dump building rubble containing uranium and radium, along with other radioactive materials inside the mound. Nowadays you can climb up the stairs to the 75-foot disposal cell. At the top there are awesome views of parts of St. Charles and St. Louis counties.

Tip by

847 m

Hamburg Trail

Highlight (Segment) • Trail

The Hamburg Trail connects the Katy Trail with the August A. Busch Memorial Conservation Area. It's a vital 6-mile trail that connects to both the Mound and Lost Valley areas.

Tip by

2.64 km

Weldon Spring Conservation Area

Highlight • Forest

From tough singletrack to smooth double-track, the Weldon Spring Conservation Area has a variety of trails that are great for riding. Be aware: just because a trail has the word "Road" in the name doesn't mean that it's the easiest route!

Tip by

3.88 km

Weldon Spring Conservation Area

Highlight • Forest

Weldon Spring Conservation Area is an 8,398-acre park managed by the Missouri Department of Conservation. The park's border runs along the Missouri River.

Tip by

8.23 km

Lost Valley Trail

Highlight (Segment) • Trail

This is what I was looking for. Narrow singletrack that runs along the terrain. Often off camber with lots of gravel sized rocks mixed in with clay and organic soils. The surface has great grip even when it’s damp. When the organic percentage rises it gives more and slips under climbing loads. The climbs aren’t too steep and there was always enough roots and rocks to keep you interested. Many stream crossings at the draws that were well prepared. Even the switchback were awesome with native stones packed in the clay to give you confidence you won’t wash out a wheel. Awesome. Be aware as of 2 May 2025 between the 5.5 and 7 mile markers there were many trees crossing the trail knocked over from a terrific wind or 🌪️. This is the area closest to the Army site.

Tip by

21.5 km

Historic Bridge

Highlight • Bridge

Here you will reach a historic iron bridge that spans over Femme Osage Creek just before entering Defiance. This is a particularly significant part of the Katy Trail, adding to its historical charm.

Tip by

24.1 km

Defiance

Highlight • Settlement

Defiance is a small town situated along Highway 94 and the Katy Trail. Serving as a gateway to the Missouri wine country, whether you're beginning, ending, or simply taking a break along the trail, you'll discover charming bars, cafes, and a handful of shops in this quaint town.

Tip by

28.8 km

Hamburg Trail

Highlight (Segment) • Trail

The Hamburg Trail connects the Katy Trail with the August A. Busch Memorial Conservation Area. It's a vital 6-mile trail that connects to both the Mound and Lost Valley areas.

Tip by

34.0 km

End point

Parking

Way Types & Surfaces

Way Types

19.7 km

14.2 km

130 m

Surfaces

14.2 km

11.6 km