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18.7 mi 30.0 km Pioneer Express Trail
Easy/Intermediate
Auburn, CA
Easy/Intermediate
Auburn, CA
1.7 mi 2.8 km Confluence Trail
Intermediate
Auburn Lake Trails, CA
Intermediate
Auburn Lake Trails, CA
3.7 mi 5.9 km Lakeview Connector Trail
Intermediate
Auburn Lake Trails, CA
Intermediate
Auburn Lake Trails, CA
8.6 mi 13.8 km Hidden Falls Loop
Intermediate
North Auburn, CA
Intermediate
North Auburn, CA 12 
2.1 mi 3.4 km Black Hole of Calcutta Falls
Intermediate
Auburn, CA
Intermediate
Auburn, CA
3.2 mi 5.2 km Mount Sanitas Loop
Intermediate/Difficult
Boulder, CO
Intermediate/Difficult
Boulder, CO 113 
2.5 mi 4.0 km Horsetooth Rock Trail
Intermediate
Bellvue, CO
Intermediate
Bellvue, CO 37 
7.4 mi 12.0 km Greyrock Mountain Loop
Intermediate/Difficult
Bellvue, CO
Intermediate/Difficult
Bellvue, CO 64