Spring - Mud Mountain Dam Marathon & Half Marathon
About this race
May 30, 2026 – The Full Marathon Returns!
We’re excited to announce that the Full Marathon is coming back on May 30, 2026, and will also be part of our September event. 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!
Marathon
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′.
Half Marathon
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.
Pick your distance
Running
Spring - Dam Marathon
Spring - Dam Half Marathon
Typical race-day weather
Based on 2 years of historical conditions on this event's race dates in Enumclaw.
About Enumclaw
Spring - Mud Mountain Dam Marathon & Half Marathon takes place in Enumclaw, Washington, United States. The local timezone is America/Los_Angeles.
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🏃 Plan Your Next Race in Enumclaw
Find upcoming events by distance:
- Enumclaw Half Marathons Top-rated 21.1K courses in the Enumclaw area.
- Marathons in Enumclaw Scenic 42.2K routes and Enumclaw Boston qualifiers.
- Enumclaw Running Calendar 2026 See all upcoming race dates.
Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.
