Sourdough Trail
The Sourdough Trail is a rocky singletrack thread that runs approximately 10.5 miles through the forest roughly parallel to Colo. Hwy 72 (called the Peak to Peak highway) in the hills northwest of Boulder.  The southern terminus of the Sourdough can be found at a trailhead on County Rd. 116 just west of Hwy 72 near the University of Colorado’s mountain research station.  From there the trail runs generally north, crossing the Brainard Lake Rd. at 5.7 miles and continuing to the old Peaceful Valley ski area.  Approximately one mile north of the Brainard Lake Rd. the Sourdough intersects with the South St. Vrain and Wapiti trails.  The most popular ride is an 11.4 mile out-n-back from County Rd. 116 to the Brainard Lake Rd., which eliminates the need for a shuttle vehicle at the northern end.  This route consists of rolling climbs through dense pine forest with occasional views to the eastern plains and foothills and has an elevation gain of 1240 feet.  As mentioned, the trail is rocky, but not too intimidating.  It is suitable for bikers of intermediate ability and above.  Riders looking for a full day in the saddle can link the Sourdough with other trails in the area for a grand ride.
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This trail was added on  by an RMBB member and was last updated on 2/20/2011 by an RMBB member.
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