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101 days since Maple City Grand Prix 2017.

Welcome to Maple City Grand Prix

Maple City Grand Prix - June 9 - 11, 2017

Watch the world's fastest tunnel boats as they handle right and left turns, switching directions on a dime and reaching speeds over 100 miles per hour in the 5th Annual Maple City Grand Prix on Stone Lake, LaPorte, IN.

The Maple City Grand Prix features racing, live music, boat parade, block party, car cruise and fun for the entire family.