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 chriscap on Sat, 04/20/2019 - 9:00am - Lost Valley (St. Charles Area)
I saw the red update. I disagree, rode everything except phase 1 on Saturday. Trail had some wet spots, but it was good to go. Trails need wheels, go get some.
From Gary Womack on Sat, 04/20/2019 - 4:40pm - Lost Valley (St. Charles Area)
Too soupy. Massive tree down on loop near Hamburg. May take two more days
From Turk1985 on Fri, 04/12/2019 - 12:57pm - Lost Valley (St. Charles Area)
Heavy rain missed here last night, tail has dried out already
From gottniner on Thu, 04/11/2019 - 12:00pm - Lost Valley (St. Charles Area)
Trail is in great shape before the rain evening.
From Dave6284 on Sat, 04/06/2019 - 7:21pm - Lost Valley (St. Charles Area)
Trails are 80% Few wet spots on lower level and a couple of muddy areas up top. The usual spots... But will be rideable through tonight.
From Mr. V on Tue, 04/02/2019 - 5:15pm - Lost Valley (St. Charles Area)
Most of the trail is bone dry. There are a few yellow spots. The wet spots are definitely muddy. Most of them have been rode around enough times that the ride arounds are muddy too. The new reroute at the end of the big loop is working out well.