“The first half of the Spring Brook Loop if riding clockwise - a rocky climb leading into the forest. ”
1.1
Miles1.8
KMSingletrack
Local Club: Boulder Mountainbike Alliance
Nov 17, 2025: Trail Update: South St Vrain
Nov 14, 2025: Another Step Closer to new Betasso Connector
Oct 24, 2025: Boulder County Moves One Step Closer to a Safer Boulder-to-Betasso Connection
Land Manager: Boulder County, CO - Parks and Open Space
18.8 mi 30.3 km • 1,068' Up 325.44 m Up • 1,066' Down 324.88 m Down
6.9 mi 11.1 km • 490' Up 149.29 m Up • 490' Down 149.28 m Down
16.3 mi 26.2 km • 1,788' Up 545.03 m Up • 1,788' Down 544.87 m Down
2.0 mi 3.2 km • 78' Up 23.73 m Up • 79' Down 24 m Down
7.1 mi 11.5 km • 768' Up 234.03 m Up • 759' Down 231.27 m Down
8.3 mi 13.4 km • 372' Up 113.47 m Up • 371' Down 113.22 m Down
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