2017 Big Shark Open Water Swim Series

Swim With The Sharks!

Get comfortable in the open water and practice your swim technique.

Each session will have programming and rides to compliment the swim, so bring your bike and get fit.  This series is staffed by Big Shark Events Staff, Local Coaches and Training Partners and a full compliment of lifeguards from BYLG Sport.

When: Most Saturday Mornings from April 29th through June 24th. The Lake will be open for participants from 8:00 am – 9:30 am. 

Where: The lake is located at New Town in St. Charles. See swim maps below. The perimeter course is .62 miles and in most areas you can touch the bottom.


  • Pre-register for each session, week by week or multiple at a time, online for $15. Pre-registration closes at 11:59pm the Friday before each swim.  
  • A Season Pass for all 8 swims can be pruchased online for the price of 7 swims or $105.  
  • On site registration is $20 per session and will open at 7:30am with separate lines for Day-Of Registrants and Pre-Registrants.
  • If the event is cancelled due to inclement weather, registration fees are transferable but not refundable.  Every effort, including delaying the start time, will be made to get the swim in. Check Big Shark's Facebook's page for swim status updates when weather is looming.

Wetsuits: The first 2 sessions, 4/29 and 5/6, will offer a Blue Seventy Free Wetsuit Demo.  For future days, wetsuit rental rate is $10.00 per session, weather and supply permitting. (2 rental payments can be applied to purchase your very own wetsuit).  To demo a wetsuit, please bring some form of collateral (ID, Credit Card) to exchange for the suit. 

Fee structure covers venue, participant insurance, professional lifeguards, equipment, additional programming and staff support. 

You can pre-register on by clicking on the link below.

GO BIG Triathlon Training Group: Bundle all of the events and way more by joining the GO BIG Triathlon Training Group

Support: Big Shark Bicycle Company will have a rental wetsuit fleet on site every week- until water temps exceed wetsuit conditions. For athletes who would like to ride after the OWS there will be an on site mechanic stand, tools and bike pump to work on your ride.

The Ride: Every Saturday following the swim, you are welcome to join riders to complete your brick training. Meet on the opposite side from the registration tent at 9:35 am. There will be a brief safety talk prior to rolling at 9:45am. All abilities welcome.

Daily Routine:

  • All Swimmers must register (or check in for pre-reg) and get marked with a number upon arrival. 
  • BYLG Sport will conduct a short course orientation to each group of swimmers entering the water. Topics include basic swim safety and signaling distress.  Please listen to lifeguards instructions at all times. 
  • Swim direction will change from week to week. 
  • Upon entering the water, please report your number to Big Shark Staff at the table. 
  • When exiting the water, again, please confirm your number with Big Shark Staff.  This is for your safety and helps keep accurate records as well as account for all swimmers present.


All vendors and programming will be available for questions during the swim. Specific Clinics will be held at the times listed.  Please meet behind the registration tents.

  • April 29th- FREE Blue Seventy westuits available. Demo and rental fleets. 
  • May 6th- FREE Blue Seventy westuits available. Demo and rental fleets. 
  • May 13th- Staff from the St. Louis Triathlon will be in attendance to explain more about the area's only Olympic distance triathlon. 
  • May 20th- BYLG Sport will conduct a FREE 30 minute swim anxiety clinic at 8am. Learn how to prepare for a variety of conditions and build your confidence in the lake.    
  • May 27th- NO SWIMS. Memorial Day weekend.   
  • June 3rd-  TBA 
  • June 10th- TBA
  • June 17th- BYLG Sport will conduct a free "What if..." clinic at 8am. Be prepared for the unexpected. Everything from rough waters, to harsh glare to dealing with injury while swimming.  
  • June 24th- Staff from Athletico's Endurance Center will be conducting free injury screenings throughout the swims. Even if you feel fine, learn more about the place to go for triathlete injuries.  

Helpful Links:

New Town at St. Charles:

Stop by The Bridge at 3257 Domain for your pre or post swim coffee (or both).

For more information on the open water swim series please contact