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Welcome to That Dam Race—an unforgettable endurance challenge set in the stunning landscape of Calero County Park.

Whether you’re taking on the Full Marathon, Half Marathon, or 13K, this course is designed to test your grit and reward you with some of the most breathtaking views in the South Bay. Expect a hilly, challenging terrain that will push your limits while showcasing the raw beauty of California’s outdoors.

Runners will wind through rolling hills lined with iconic California oak trees, vibrant native plants, and wide-open vistas that overlook the park’s scenic reservoirs and valleys. Along the way, keep an eye out for local wildlife—you might spot deer, hawks, or other native species that call this park home.

This isn’t just a race—it’s an experience. That Dam Race combines physical challenge, natural beauty, and an electric race-day atmosphere to create something truly unforgettable. Whether you’re chasing a PR or just looking to conquer the course, this is one race you don’t want to miss.

The Deets...

Park Information: Calero County Park

Start Time: 8am for all races

Check-In & Bib Pick-Up: Race Morning 7am-8am

Time Limit: There is a 6-hour time limit. All runners must be off the course by 2pm

Parking: Parking is available inside the park. There is no parking fee. 

Directions: The start line will be staged directly across the parking lot on the other side of the enclosure. See Google Map at the bottom of the page.

Awards: All race participants will recieve a custom finisher medal and race sport-tek t-shirt. Special awards will be provided for placement winners. Results will be announced via email Sunday morning. 

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Full Marathon Course Map

For a complete elevation profile, click play, select menu, then select hills.

Half Marathon Course Map

For a complete elevation profile, click play, select menu, then select hills.

13K Course Map

For a complete elevation profile, click play, select menu, then select hills.

We are always looking for volunteers to help with our event. All volunteers will receive one free race entry at any of our Shellback Racing Trail racing events. Click the tab below to sign up as a volunteer. 🙂

Volunteer Sign-Up. Click Here

All trail run entry fees are non-refundable and non-transferable. We do not offer refunds, transfers, deferrals, or exchanges to future events except as outlined below. Only registered participants may compete; entries may not be transferred or given to another runner under any circumstances.

We will issue a race credit equal to 50% of the original entry fee toward a future Shellback Racing event if we receive written notice of cancellation at least three (3) weeks prior to race day. Credits are valid for one (1) year from the date issued. No credit will be issued for cancellations made within three (3) weeks of the event.

We recognize that injuries, illnesses, emergencies, conflicts, or other unforeseen circumstances can occur. However, regardless of the reason, we must strictly adhere to the cancellation policy above and cannot provide refunds, credits, transfers, or deferrals outside of these terms.

If Shellback Racing must cancel an event entirely for any reason, no refunds will be issued. This includes, but is not limited to, earthquakes, floods, extreme weather, unsafe air quality, pandemics, or other force majeure (“Act of God”) events. At its sole discretion, Shellback Racing may offer future race credits or deferrals depending on the circumstances and the timing of the cancellation. All registered participants will be notified as soon as possible with relevant details. Races will not be canceled due to rain or heat.

Course routes are subject to change at any time due to trail work, closures, or requirements from permitting agencies. These changes are beyond our control and will not qualify for refunds, credits, deferrals, or transfers (except as noted above).

If a race location changes but the event is still held on the same date, registrations will automatically transfer to the new venue. Participants may also choose to complete the race remotely, in which case awards will be mailed. If a race is postponed, all registrations will be transferred to the new date.