The Tanana River Race Challenge is a multi-sport endurance event (run, ski, cycle, skijor). There are 2 race distances - 25 and 45 miles. The race course start and finish lines are adjacent to the Chena Pump Recreation Site. The course for both distances runs along the Tanana River and through the Tanana State Forest Trails. The race starts 8 am for 45 mile course, 9 am for the 25 mile skijor, and 10 am for the other 25 mile races (ski, bike, and run).