The Crescent Moon Sprint & Olympic Triathlons take place at the beautiful Aurora Reservoir! This means crystal clear water for the swim, a fun 20k or 40k bike course with eight miles that are completely closed to auto traffic, a run that is also traffic-free, and a fantastic post-race picnic & expo area - all with convenient parking! The 9th annual Crescent Moon Sprint Triathlon promises to be bigger and better than ever! Join us at the Aurora Reservoir, and experience the Racing Underground difference!