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 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!
From RichLee0717 on Thu, 09/13/2018 - 12:39pm - Lost Valley (St. Charles Area)
It's in great shape, however there is a very large tree down across the middle gravel climb about half way up the climb.
From sai on Mon, 09/10/2018 - 5:30am - Lost Valley (St. Charles Area)
Great shape. There are about 4 puddles, but that's the anomaly - all is tacky/perfect.
From RichLee0717 on Sun, 08/26/2018 - 4:16pm - Lost Valley (St. Charles Area)
This morning the trail was great, just a few wet low spots you can avoid. New tree down on single track just before the fire road going ccw on the west side. You cannot go through it, had to go down the hillside.
From Mr. V on Wed, 08/22/2018 - 6:21pm - Lost Valley (St. Charles Area)
What dirt is there is in good shape. One or two squishy spots that's all. Two trees down. 1 before the second section of singletrack. The other around the seven mile marker.
From Maven on Wed, 08/08/2018 - 4:14pm - Lost Valley (St. Charles Area)
All good, as LV can be just good riding. One annoying tree down messy CX walk through. In between the cedars and the second double track on the way to Beaver time.