Mud Mountain Dam Marathon
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Mud Mountain Dam Marathon & Half Marathon : Event details
The Mud Mountain Dam events are scheduled for May 30, 2026 and September 19, 2026. Distances offered include:
- Marathon
- Half Marathon
- 5K
The full marathon starts near Mud Mountain Dam and finishes at the McMillin Foothills Bridge, with a net elevation loss of about 1,200 feet. The marathon course is fully paved, follows the Carbon River through farmland and forest, and is USATF certified (WA21013RMB). The half marathon begins in South Prairie, follows the paved Foothills Rail Trail alongside the Carbon River, finishes at the McMillin Foothills Bridge, and has a net elevation loss of 339 feet (USATF certified WA23029RMB). The 5K is an out-and-back that starts and finishes at the McMillin Foothills Bridge with a neighborhood loop near High Cedars Golf Club.
Logistics, support and rules
Aid stations are placed about every 2 miles and provide water, electrolyte (Nuun), gels, porta-potties, and basic medical support; medical personnel are on course and at the finish. Packet pickup is scheduled the day before the May 30, 2026 event at Central Co-Op in Tacoma. Shuttle service runs between Orting parking locations and the start areas; parking at the McMillin Trailhead is limited. Time limits apply - 6 hours for the marathon and 4 hours for the half; early start options are available for runners who need extra time under specified conditions. Registration includes a finisher medal, a tech shirt (size guaranteed by a registration cutoff), and a collective bib. Entry fees are non-refundable. A portion of proceeds supports the Humane Society of Tacoma & Pierce County. Visit the organization's website for the most recent information.
