HALF DISTANCE BOULDER TRIATHLON Swim: 1.2 miles, counterclockwise, starting from the east boat ramp at Boulder Reservoir with an average water temperature of 62°F (17°C). Exit at the west boat ramp and head to the transition area. Bike: 56 miles, 2-loop course with freshly paved roads and minor enhancements for a smoother ride. Begins at Boulder Reservoir, heads onto Diagonal Hwy, Foothills Hwy, rural Hygiene Rd, and 63rd St. The route features short rollers, fast descents, and scenic views. ...