Half Distance 70.3 Triathlon Rockford, Illinois: Course Overview Swim: The 1.2-mile swim takes place in the Rock River, starting near the Rock Guardians sculptures and ending at Davis Park. The average water temperature is 79°F (26°C), offering ideal conditions. Bike: The 56-mile bike course features gently rolling hills and scenic farmland north of Rockford. Athletes will pass through Rockton Township before returning from the west. Run: The 13.1-mile run is a two-loop course along the Rock ...