How deep is the St. Johns River?
How deep is the St. Johns River? It becomes a broad estuary north of Palatka and east of Jacksonville, where it has its deepest channel at about 40 feet (12 metres) and is a marsh. Over its entire course it has a fall of less than 30 feet (9 metres), and tidal currents reach far upstream.
Are there bull sharks in the St. Johns River?
Only the bull shark typically found offshore of Jacksonville can migrate into the local river and swim any distance upstream for very long. Recently a small bull shark was caught near Mandarin. There have been periodic reports of other sharks, usually bulls, being captured in the St. Johns River.