Mud Mountain Dam Marathon - Fall
Enumclaw, Washington, United States
Sep 19, 2026 - Saturday
Half-marathon, Marathon
Race Information
Start planning now for your next Boston Qualifier on this beautiful, fully paved downhill course. No tunnel, no dirt, no BQ penalty. There’s no excuse not to do the dam thing!
The marathon course begins at Mud Mountain Dam (elevation 1,400′). Runners will follow a fully paved route through picturesque farmlands and forested areas, tracing the path of the Carbon River. The race finishes in front of the historic McMillin Bridge (elevation 200′), with a total net elevation loss of approximately 1,200′.
The Half Marathon begins in the scenic town of South Prairie (elevation 467′) and follows a gradual downhill route along the paved Foothills Rail Trail. Runners will enjoy a picturesque journey through farmland and forest, winding alongside the Carbon River and finishing in front of the historic McMillin Bridge (elevation 128′). The course features a net elevation loss of 339 feet.
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Downhill Super Series 🪽
3 of the Fastest Boston Qualifier Courses in the U.S.
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Boston Marathon qualifying eligible with no downhill penalty! Marathon and half marathon distances un through the iconic Snoqualmie Tunnel.
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🌲 Jack & Jill Marathon & Half - July 25 & 26th
⛰️ Cascade Express Marathon & Half - Sept. 12th
These smooth rail-trail courses feature sustained net downhill profiles designed to help runners chase personal bests and Boston Qualifying times. Located along the Palouse to Cascades Trail, this historic rail tunnel offers cool temperatures and a unique running experience before the course continues downhill toward the finish.
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Race Facts
Race Size: 500 - 1,000
Elevation: Downhill
Course Type: Road
Boston Qualifier: Yes
Kids Run: No
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