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      The name comes from the bootleggers who once made use of the area, getting lost among the numerous hollows. It was also near the site of an ammunition works and uranium processing plant which necessitated the cleanup that lies under the large mound on Hwy. 94. Now, the trail is a 10.5 mile loop with a mixture of double and singletrack punctuated with old homesteads, rock formations, natural springs, and a waterfall crossing. This is a very scenic and enjoyable mountain bike experience.

      The gravel/doubletrack sections are fairly flat. The singletrack sections are super-flowy with punchy rock obstacles that will reward you with great views and better riding, the trail can get technical in spots and is now a much longer ride due to the increased singletrack. Be advised that this 10.5 mi loop will take some riders 2 hours to navigate due to the amount of singletrack and the difficulty of the rocky sections. There is a central fire road that cuts the loop almost in half which can be used to shorten or lengthen your ride.

      Trail surface varies from dirt to rock throughout the trail, and drains very well, except in the flats of the lower creek bottom.

      The trail is open until 10 pm, so it's a good place to ride at night.
      source: Lost Valley
      Primary Trail Type: Cross-Country
      Land Status: Conservation Reserve
      Weldon Spring Lewis & Clark Trailhead google parking directions
      Access Info:
      From the Highway 40/94 interchange: Take Highway 94 South approximately 5 miles. The trailhead parking lot will be on your right hand side. It is not very well identified as "Lost Valley". A good landmark is the shooting range at the top of a hill on the right hand side of Hwy 94. When you descend that hill the parking lot will be on your right hand side, at the very bottom.
      Links
      Activities Click to view
      Region Details
      • 6
      • 1
      • 3

      Region Status
      Caution as of Mar 28, 2025
      Local Trail Association

      Stats

      Avg Trail Rating
      Trails (view details)
      14
      Trails Mountain Bike
      10
      Trails Hike
      14
      Trails Trail Running
      14
      Total Distance
      40 miles
      Total Descent
      2,742 ft
      Total Vertical
      293 ft
      Highest Trailhead
      755 ft
      Reports
      130
      Photos
      25
      Ridden Counter
      2,573

      Photos of Lost Valley Mountain Bike

      19 |
      Oct 24, 2024 @ 8:37am
      Oct 24, 2024
      140 |
      Apr 23, 2022 @ 2:25pm
      Apr 23, 2022
      140 |
      Apr 23, 2022 @ 2:25pm
      Apr 23, 2022
      128 |
      Apr 23, 2022 @ 2:24pm
      Apr 23, 2022
      20 |
      Mar 15, 2022 @ 9:15am
      Mar 15, 2022
      22 |
      Mar 15, 2022 @ 9:15am
      Mar 15, 2022
      149 |
      Mar 3, 2022 @ 9:33am
      Mar 3, 2022
      133 |
      Dec 2, 2021 @ 7:57pm
      Dec 2, 2021

      Videos of Lost Valley Mountain Bike

      Mountain Biking Lost Valley Trail in St....
      14:58 | 8 | Apr 4, 2025 , St. Charles
      Lost Valley Trail Weldon Springs MO-Best from...
      44:01 | 355 | Oct 5, 2023 , St. Charles
      youtuber Lost Valley Trail, St Charles, Missouri
      8:10 | 937 | Oct 29, 2021 , St. Charles

      Recent Trail Reports

      Activity Feed

      usernameactiontypetitledate
      geostaraddvideoactivity #69003469
      Apr 4, 2025 @ 4:21pm
      Apr 4, 2025
      cubuffs85addreportactivity #68591441 and 1 more
      Mar 28, 2025 @ 5:16pm
      Mar 28, 2025
      rmhchsaddreportactivity #68084431
      Mar 20, 2025 @ 8:25am
      Mar 20, 2025
      Pieper17wishlisttrailactivity #61624062
      Nov 11, 2024 @ 1:12pm
      Nov 11, 2024
      300lbmtnbikeraddphotoactivity #60866522
      Oct 24, 2024 @ 8:37am
      Oct 24, 2024

      Recent Comments

      usernametypetitlecommentdate
      perfectglock17trailLost Valley TrailCCW is most fun for me. Gets most of the rough...
      Aug 3, 2023 @ 10:50am
      Aug 3, 2023
      PmennitttrailMonarch Chesterfield LeveeLook
      Jul 9, 2023 @ 5:56am
      Jul 9, 2023
      meldmakertrailLost Valley TrailThe single track is quite fun but there’s a...
      May 5, 2023 @ 4:29am
      May 5, 2023
      grantbob94trailLost Valley TrailI rode CCW, but found myself doubling back for...
      Apr 27, 2022 @ 8:19pm
      Apr 27, 2022
      JeremySchmidtytrailLost Valley ConnectorNatural spring located at ~0.6 mile mark. Look...
      Mar 12, 2021 @ 10:13am
      Mar 12, 2021

      Nearby Areas

      namedistance
      Broemmelsiek Park 23.9 km
      Matson Hill Park 5 6 44.8 km
      Klondike Park 2 6 38.1 km
      River's Edge Park 18.9 km
      Quail Ridge Park 4 59.3 km

      Activity Type Stats

      activitytypetrailsdistancedescentdescent distancetotal verticalratingglobal rankstate rankphotosreportsroutesridelogs
      Mountain Bike1031 miles1,647 ft11 miles292 ft
      #2,628#1,38224128310,944
      Hike1440 miles2,743 ft15 miles292 ft
      #2,053#1,2381130192
      Trail Running1440 miles2,743 ft15 miles292 ft
      #2,056#1,236130208
      • By pilznrTF Pro GORC & contributors
      • Admins: GORC
      • #10407 - 7,978 views

      Downloading of trail gps tracks in kml & gpx formats is enabled for Lost Valley.
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