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South Shore to Lost Fork Loop - River's Edge Trail

 4.3 (8)
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Map Key

16.2 Miles 26.1 Kilometers



1,432' 437 m


-1,433' -437 m



Avg Grade (2°)


Max Grade (10°)

3,399' 1,036 m


3,057' 932 m


Shared By John Juras



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Perhaps the finest MTB ride in Montana, this purpose built trail has something for everyone.

John Juras

Dogs Off-leash

Features -none-

Closed after wet weather due to gumbo clay trail surface. Otherwise, no restrictions.


This ride is made great by the terrain variety, a mixture of fast flowing and tougher segments, scenery, trail surface, length, well marked, uncrowded, varied vegetation, all singletrack, and good maintenance.

Beware occasional cliff exposure in the Mayhem segments. Stay on the trail to avoid the Prickley Pear Cactus.


This well-marked and easy to follow trail offers spectacular views, a good variety of riding, many miles of MTB specific trails built with the help of the Great Falls Bicycle Club and IMBA's Trail Care Crew, some cliff exposure, and LOTS of Woo-Hooo singletrack.

In general there is a parallel trail network with the more technical trails being farther down the hill and easier lines along higher ground. This can be ridden as a "loop" or an out-and-back. There are some short "trials" type riding segments at the far end (Lost Fork Loop) of the trail.

Lots of ups and downs along the route with about 1,500 vertical feet of elevation gain along the full length of the loop.

Don't miss the scenic overlook above Ryan Dam which is on a short spur off the main trail.

There is easy access to trailhead by either riding there on the 50+ mile River's Edge Trail network (, or driving northeast from Great Falls along the Giant Springs Scenic Byway.


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Your Check-Ins


Jul 17, 2018
Paul Brooks
This trail rides so well. Lost fork section is also superb. Stimulating trail riding and lovely scenery. Don’t look around too much though.
Jun 10, 2017
Thomas Glanzer
Aug 31, 2016
Holly Frank
Aug 6, 2016
Jim Hall
Great trail. Take the "high road (trail) or take the low road. In other words. Stay low (or more difficult lower black trail) or stay higher easier tr 13.7mi — 1h 35m

Trail Ratings

  4.3 from 8 votes


in Great Falls


  4.3 from 8 votes
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in Great Falls


in Montana


34 Views Last Month
2,041 Since Jun 26, 2015
Intermediate Intermediate

John Juras
Great Falls, MT
John Juras   Great Falls, MT
The Lost Fork Loop has amazingly tight and technical single track that is 100% ride-able by expert riders. Definitely a unique riding experience in exceptionally wild country which looks much like what Lewis and Clark saw. Jul 12, 2015
Don't be put off by the Expert rating or the drop in to Choas, the rim trails are intermediate unless you are easily spooked by some moderate exposure. I am not an expert rider and I had a blast on the expert trails. Oct 22, 2016
Angus_not_so_Young JCG   HUNTSVILLE
Walked the trail in early 2017. Gave me the incentive to buy a new MTB and get back into it! Looking forward to visiting again soon, this time with my bike!!! Jul 14, 2017

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