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Arapaho and Roosevelt National Forests and Pawnee National Grassland
Located within the Boulder Ranger District, the 12 mile Sourdough
Trail is a premier single track bike trail which travels from
Peaceful Valley Campground
to Rainbow Lakes Road, passing
through Brainard Recreation Area and receives a high level of use. The
southern half, done in the more downhill direction from Brainard to
Rainbow Lake Road (a return via the Peak-to-Peak Highway is possible) is
rated moderate. The northern end of Sourdough Trail is more steep &
technical with the steep, loose rock climb/decent to the Middle Saint
Vrain being especially difficult.
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