On July 27, 1994, the Department of Environmental Protection adopted a Manatee Protection Plan for St. Lucie County which included a number of boat speed regulatory zones designed to minimize the number of accidental strikes by boats to manatees. This plan is now Florida Law Section 68C-22.008 F.A.C. 

St Lucie County Manatee Protection Zone Law.pdf

Visit the Florida Fish and Wildlife Conservation Commission website to find out more about waterway regulations.