Half Distance Triathlon Washington Tri-Cities: Course Overview Swim: Begin your 1.2-mile downstream swim in the iconic Columbia River, starting at Howard Amon Park near the Lee Boulevard Boat Dock. Athletes will exit at Columbia Point Park and transition on the grassy athletic field. This spectator-friendly swim route offers plenty of viewing opportunities along the scenic Riverfront Trail. Average water temperature: 68°F (20°C). Bike: Embark on a 56-mile ride through rolling country roads, ...