The Atomic Multisport Event

OCT
10
2026
Multisport races at TVA Melton Hill Dam featuring sprint, Olympic and half iron triathlons, a sprint duathlon, aqua bike options and relays with looped swim, bike and run courses.
Sat 10 Oct 2026
Sprint 500 m 18.6 mi 5 km Sprint 5 km 18.6 mi 5 km Olympic 1500 m 40 10 km Middle distance

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About the race

The Atomic Multisport Event at the TVA Melton Hill Dam area is a day of triathlon and duathlon races organized by Personal Best Racing. Events on the program include an individual Half Iron triathlon, sprint and Olympic triathlons, a sprint duathlon, aqua bike options, and relay divisions. The venue centers on the Melton Hill swim area, transition near the campground, and bike and run loops that stay around the dam and nearby roads. Swim courses use looped formats with buoyed turns; swimmers are required to complete prescribed loops and exit only at designated points.

Water temperature for the Half Iron swim is listed at approximately 73°F. The Half Iron bike includes two 20 mile loops on roads that connect back to the venue; the Half Iron run follows dam roads and completes two loops. Cut off times for the Half Iron are set for safety: swim 1:15, bike 5:15, and a 7:15 overall limit to the halfway run point to finish line.

Fog may delay swim starts for safety. Packet pickup and late registration are available at the race site on the day before and on race morning; picture ID is required and relay teams must pick up packets together. Parking is in lower lots below the dam with drop off at the upper bath house; the campground lies across the park access road. All events are sanctioned by USA Triathlon and require a one day license or annual membership.

Personal Best Racing enforces a no refund policy and offers optional event insurance. Event shirts are not guaranteed for registrations within two weeks of the event. Visit the organization's website for the most recent information.

10 km
Olympic Triathlon Run
5 km
Sprint Triathlon Run
5 km
Sprint Duathlon Run 2
5 km
Sprint Duathlon Run 1
Atomic Olympic Triathlon
Atomic Sprint Duathlon
Atomic Sprint Triathlon
Individual Half Iron Triathlon
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