355d is a hiking, biking, and horse trail in Boulder County, Colorado. It is within Roosevelt National Forest. It is 1.5 miles long and begins at 8,690 feet altitude. Traveling the entire trail is three miles with a total elevation gain of 458 feet. The Site 11 camp site can be seen along the trail. The trail ends near the Site 8, Site 12, and Site 9 camp sites.
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