Mud Mountain Dam Marathon (Spring)
Race Day Weather
Cool start, warming finish
Runners will face a cool start at 41°F, gradually warming to 55°F by the finish. With a light headwind in the early miles and more crosswinds later, pacing adjustments may be necessary, particularly between miles 10-22. Humidity is high at 73%, which could impact performance, suggesting runners should start conservatively and stay hydrated. A throwaway layer may help during pre-race as temperatures feel as low as 38°F.
This course drops 1,204 ft from start to finish, so we look at it at 2 points, not just the start line. In a typical year, at 9:00/mi, you start at 41° and finish around 10:55 AM in 55°; typical start-line conditions say 50° then.
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Race Info
The Mud Mountain Dam Marathon (Spring) is a USATF-certified point-to-point marathon that starts at Mud Mountain Dam near Enumclaw, Washington and finishes at the historic McMillin Bridge, with a net elevation loss of about 1,200 feet. The paved course follows the Foothills Rail Trail and Carbon River through South Prairie and Buckley. It is organized by the Tacoma City Marathon Association and is a Boston Marathon qualifying race with no downhill time-adjustment penalty. A companion Fall edition of the Mud Mountain Dam Marathon runs the same course each September.
