Mud Mountain Dam Marathon
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Event overview
The Mud Mountain Dam events take place in spring and fall, with dates listed for May 30, 2026 and September 19, 2026. The weekend program includes a marathon, a half marathon and a 5K. The marathon and half marathon routes are fully or mainly paved and finish at the McMillin Foothills Bridge. Courses run through farmland and forest and follow sections of the Carbon River and the Foothills Rail Trail. The marathon has a net elevation loss of approximately 1,200 feet. The half marathon has a net elevation loss of 339 feet.
Courses and logistics
- Marathon
- Half Marathon
- 5K
Both the marathon and half marathon courses have USATF certification. Aid stations are placed at roughly two mile intervals and provide water, electrolyte drink (Nuun), gels, porta-potties and basic first aid; medical personnel are on course and at the finish. There is a 6 hour time limit for the marathon and a 4 hour time limit for the half marathon. Participants who need extra time may start one hour early under self-supported conditions; early starters have specific disqualification rules if they finish below stated times. Shuttle service to the starts runs from Orting (school parking), finish-line parking at the McMillin Trailhead is limited, and the Mud Mountain Dam Park lot is closed and gated during the event. Race registration includes a finisher medal and race shirts when ordered by the published cutoff; a portion of proceeds supports the Humane Society of Tacoma & Pierce County. Awards are age-group ribbons for the top five in standard age brackets and are available at the results tent. Visit the organization's website for the most recent information.
