Just found this online and it looks like a good time. I would love to go! "You Only Live Once" is the triathlon's manta. The YOLO tri is formally the Rattlesnake triathlon, now under leadership of 5430 Sports known for creating some of the original Ironman triathlon courses!
At beautiful Aurora reservoir, the park is closed to all other users creating a safe and enjoyable swim, bike and run environment for athletes. Sprint and Olympic distances are available in this USAT Sanctioned event which is only open to only the first 1200 athletes of all ages and ability levels. Website: http://www.5430sports.com/yolo/