This event attracted over 3,000 runners to Riverside Park in 2013. The event features two race courses and more than 20 obstacles. Athletes experience an action packed day with family and friends while giving back to our military heroes. Racers compete on either 5K or 10K courses that included military-style obstacles, mud crawls and strength challenges. The Merrell Down & Dirty Mud Run got even the littlest enthusiasts in the action by participating in the Adventure Kids race courses -- a one-mile mud run or a shorter adventure dash, all ending in the massive mud pit to crawl to victory.