4 Peaks Racing is very excited to announce The Carlos O Briens Prospector Triathlon on Saturday, October 9! This Sprint & Olympic distance triathlon will be held at Lake Pleasant, one of Arizonas most scenic recreation areas. Stake your claim at the Valley of the Suns only open-water Olympic distance triathlon this fall! Hosted at Lake Pleasants south boat ramp, this fun and challenging course will test all levels of athlete.