River Run Trail: This trail provides a link the Bald Mountain Trail and the Warm Springs Trails allowing for shorter loops on the mountain. (For mountain bike use, the Bald Mountain Trail is open to uphill bike traffic only.) The trail utilizes 15 switchbacks as it climbs from the River Run base area through the forested slopes above the lodge. After 3 miles the single-track trail connects with a mountain service road known at the Warm Springs Traverse Trail. Riders and hikers can continue up the Warm Springs Traverse Trail to pass through the Frenchmen's ski area of the mountain before reaching the high point of the traverse at the base of the Flying Squirrel ski run. The Warm Springs Traverse Trail descends from this high point to meet up with the Warm Springs Trail and options for climbing, or descending on same. Descenders drop to the Sun Valley Company's Warm Springs Base Area. From here one can pedal out to Warm Springs Road to head back into Ketchum and the River Run Base Area to complete the loop.
For more detailed descriptions, topo maps, and information on the history, geology, and wildflowers of the Wood River Valley pick up a copy of Exploring Sun Valley
online or find it at one of several local shops.