Half Distance Triathlon Oregon – Fast, Scenic, and Challenging Swim – 1.2 Miles Downriver in the Willamette River The triathlon kicks off with a 1.2-mile swim in the Willamette River, starting at Minto Brown Island Park. The downriver current provides a speed boost, making for a faster swim time. Swimmers navigate along the buoy lines, finishing at Riverfront Park, where the average water temperature is a comfortable 65°F (18°C). Bike – 56 Miles of Rolling Terrain and Scenic Views The 56-mile ...