Half Distance Triathlon Boise - Overview: Swim: The 1.2-mile, one-loop swim takes place in the pristine waters of Lucky Peak Reservoir, starting and finishing at Barclay Bay. Athletes exit the water and head to Transition 1 at the Barclay Bay Parking Area. Avg. Water Temp: 72°F (22°C). Bike: The 56-mile bike ride begins with a sweeping downhill from Lucky Peak Reservoir, offering scenic rural roads and neighborhood streets. The ride finishes at Transition 2 in downtown Boise. Run: The flat ...