Begin running from the Horse Gulch trailhead, and then take a right onto the Telegraph Trail. Telegraph can be a bit of a grind at times, but as you get higher and higher up the trail, beautiful views slowly begin to open up, giving an indication of what you'll find at the top. While you'll gain elevation consistently, this section has nothing exceedingly technical. The climb does finish with a short, steep pitch to reach the saddle, but after that, the grade mellows out substantially.

From the pass, you'll enjoy some fantastic sidehilling before dropping swiftly down Yellow Brick Road into the Sidewinder trail. Upper Telegraph, Yellow Brick Road, and Sidewinder all provide smooth buffed-out singletrack. The manicured trail tread provides fast running, but the difficulty will kick up a notch when you drop into Skull Rock.

The initial steep descent into Skull Rock provides a taste of what's to come. There are a few steep sections and big blocky rocks to negotiate, but the change in character provides welcome diversity to this run.

The final stretch of the descent on Big Canyon is aptly named, with the trail rolling through the bottom of a steep-sided canyon. At times, you're running directly down the stream bed. The eons of water action have carved entertaining features, such as a rock wall in a corner of the canyon. This final section of trail is one of the true highlights of the route, but like all good things, it soon comes to an end.

The route connects along some pavement to reach the Railroad Trail, providing a beautiful pedal along the river to return. You'll have to run along more pavement on Sawmill Road to reach the next section of singletrack, but ultimately you'll complete the loop on trail.