The Half Distance Triathlon in Oregon offers a scenic and fast course. Swim: The 1.2-mile swim takes place in the downriver current of the Willamette River, starting at Minto Brown Island Park and ending at Riverfront Park. The current aids swimmers, and the average water temperature is 65°F (18°C). Bike: The 56-mile bike route is an out-and-back course along country roads and the Willamette River, featuring a mostly flat terrain with a few rolling hills. Run: The 13.1-mile run is a flat ...