Two water management districts and various organizations maintain Lagoon information.
To learn more about the Lagoon, please visit these websites:

St John's River Water Management District

US Environmental Protection Agency

Manatee Observation and Education Center

Smithsonian Marine Center at Fort Pierce

Florida Oceanographic Society

America's National Wildlife Refuge Service

Florida Department of Environmental Protection

Florida's Aquatic Preserves

Marine Resources Council

Oxbow Eco-Center

Environmental Learning Center