The Race Radar

Mud Mountain Dam Half Marathon / 5K

Buckley, Washington
Saturday, September 20, 2025

Organizer's Description

MARATHON UPDATE: The Spiketon Foothills connection bridge is scheduled to be complete in September, with the unknown that it could potentially not be finished we are NOT holding the Dam Marathon distance in 2025.

The Fall Event offers a half marathon & 5K, there’s no excuse not to do the dam thing!

The Half Marathon course starts in the scenic town of South Prairie (elevation 467′), gradually taking you downhill on the Foothill Rail Trail. You’ll pass through farmlands and forest, snaking along the Carbon River, and finishing in front of the Historic McMillin Bridge (elevation 128′). The surface of the course is fully paved. The Half Marathon has a net elevation loss of 339 feet.

The 5K course will be an out-and-back on the Foothills Trail. The 5K will start and finish in front of the McMillin Foothill’s Trail Bridge.

The 5K course will be an out-and-back with the loop along the Foothills Trail. The 5K will start and finish in front of the McMillin Foothill’s Trail Bridge.

Race Events

Dam Half Marathon

Start Time: 8:15:00 AM

Dam 5K

Start Time: 9:00:00 AM

Race Information

Mud Mountain Dam Half Marathon / 5K logo

Date

Saturday, September 20, 2025

End Date

September 20, 2025

Location

Buckley, Washington

South Prairie Veterans Park

350 WA-162

98321

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