Half Distance Boulder Triathlon: Key Details and Course Highlights Swim Course: - Distance: 1.2 miles - Location: Boulder Reservoir (East Boat Ramp to West Boat Ramp) - Water Temperature: Average 62°F / 17°C Direction: Counterclockwise Bike Course: - Distance: 56 miles - Route: 2-loop course Highlights: - Freshly paved roads and minor enhancements - Starts at Boulder Reservoir - Diagonal Hwy to Foothills Hwy - Short rollers, rural Hygiene Rd., downhill on 63rd St. - Lap 2 ...