A trail that starts in Washington and ends in Keota will play host to the fourth annual Kewash Trail Half Marathon this weekend. Participants will have a chance to run the 13.1-mile half marathon, a 10-kilometer route, or a five-kilometer distance. Runners will start in downtown Washington, do a loop, and then make their way to the trail, with water stops every two miles. The event will run from 8 a.m. to noon.