Half Distance Triathlon Louisville: Key Course Details Swim Start your race with a 1.2-mile downriver swim in the Ohio River, featuring downtown Louisville views. The course begins near River Park Place Marina and finishes at the Great Lawn in Waterfront Park, with water temps around 80°F (27°C). Bike Enjoy a scenic 56-mile bike ride through Kentucky’s horse country in Oldham County, then return to transition at Waterfront Park. Run The 13.1-mile run takes you through Louisville’s ...