The Sourdough Trail is one of the nicest single-tracks in Boulder County. When many other trails in the area turn sandy toward the end of summer, the Sourdough is still hard-packed dirt because it's shaded and at high altitude. Begin by climbing rather steeply through a section of dense pine forest on switchbacking, occasionally rocky/technical trail. This is fairly slow going, as indicated by...
 http://www.dirtworld.com/trails/trail.asp?id=143&trail_name=Sourdough
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