The Half Distance 70.3 Triathlon in Rockford, Illinois features a swim, bike, and run course through scenic areas of the city and surrounding regions: Swim: A 1.2-mile downriver swim in the Rock River, starting near the Rock Guardians sculptures and ending at Davis Park. Water temperature averages 79°F (26°C). Bike: A 56-mile loop takes riders through the rolling hills and farmlands north of Rockford, with plans to pass through Rockton Township. The route heads north out of town and returns ...