Train Smart for the Oregon Half Distance Triathlon – Built for Masters 40+ The Oregon Half Distance Triathlon offers a rewarding yet demanding course—ideal for experienced athletes ready to perform. With a 1.2-mile downriver swim in the Willamette River, a 56-mile ride through gently rolling country roads, and a flat, fast 13.1-mile run along scenic river trails, this race demands efficiency, endurance, and smart pacing. Average water temps hover at a comfortable 65°F, while race-day air ...