Lost Valley

Lost Valley

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.


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. It can also be accessed by going 7.2 miles east on the Katy Trail from Klondike Park.

Trail Information




10.5 miles




Trail Conditions

Latest Conditions

From Mr. V on Wed, 11/07/2018 - 5:11pm - Lost Valley (St. Charles Area)
The trail is in pretty good condition for the most part. There's a tree down around 5 and 3/4. Right around the same spot there's quite a few mud holes but they're pretty easy to get around. Everything else is buried beneath the leaves.
From Travis Arnold on Wed, 11/07/2018 - 4:09pm - Lost Valley (St. Charles Area)
the leaf gods went full send the past couple of days - trails pretty dry but very leaf covered; roots and rocks lurking but good to get out there
From Stinsonia on Sat, 11/03/2018 - 6:18pm - Lost Valley (St. Charles Area)
Mostly well drained & rideable. A few muddy patches but easy to avoid them. Wet leaves make for a few pretty slick moments.
From pilznr on Tue, 10/09/2018 - 2:30pm - Lost Valley (St. Charles Area)
All good.
From honcho on Fri, 10/05/2018 - 9:07am - Lost Valley (St. Charles Area)
Trail is in good shape however there is a large tree down over the middle climb. There is another tree down on the double track climb after the drop in that can be ridden under but it's precarious
From Plumberboy on Thu, 09/20/2018 - 9:42pm - Lost Valley (St. Charles Area)
Trail is great and fast. There are a few trees down in random areas. To big to move or I would have. All are fun to to go over but just be aware!