A previous year's Jordanelle Triathlon shown here, this years' is June 20. Photo: TownLift // Michele Roepke PARK CITY, Utah — The annual triathlon held at the Jordanelle Reservoir will take place on Saturday, June 20. It’s Utah’s longest-running triathlon, voted one of America’s favorite triathlons by Triathlete Magazine, and consistently sells out. Since 1998, the swim, bike, run race continues to offer Sprint and Olympic distances, and athletes may race as individuals or as teams. Register here.