The 100K runs point to point along the Black Canyon National Recreation Trail through the Sonoran Desert, generally heading south. It starts at Mayer High School in Spring Valley with about three miles of paved and dirt road, then joins singletrack and jeep tracks all the way to the Emery Henderson Trailhead near New River. The first 20 miles are quick and downhill, so pace yourself: the climbing, steep descents and rocky sections come late. Expect creek crossings, nine aid stations and a 20-hour limit. A finish inside 17 hours counts as a Western States qualifier. The 50K runs the next day and ends at Deep Canyon Ranch.
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