- Gaston, OR
Hagg Lake Triathon Rich in Beauty, Rich in Tradition! Come race at the 36th Annual Hagg Lake Triathlon & Endurance Sports Festival, one of the oldest and most gorgeous Triathlon courses in the nation! Now offering an Off-Road Triathlon, Half Marathon Plus Trail Run, 5K Trail Run & Camping! Olympic & Sprint Triathlon, Duathlon & AquaBike.