County Road 129j is a hiking, biking, and horse trail in Boulder County, Colorado. It is within Indian Peaks Wilderness Area and Roosevelt National Forest. It is a mile long and begins at 9,949 feet altitude. Traveling the entire trail is 1.9 miles with a total elevation gain of 419 feet. The trail ends near the Seventhirty Tunnel (elevation 9,997 feet) quarry.
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