Tropical storm Allison in 1992 dislodged a huge selection of acres of floating vegetation and hydrilla from many with the St. Johns River headwater lakes. Masses of hydrilla and floating crops were carried downstream and jammed from the U.S. Highway 192 bridge. Crops were being compressed into a decent mass https://alexisdwnds.theblogfairy.com/32717558/5-simple-statements-about-rivers-in-florida-with-manatees-explained