Boblee,
There is but it goes thru private property and 1 spot of it is involved in a fight with SWFWMD over a leaking berm. So don't try that one. BUT, if you have a real powerful boat and can get up the side of the outfall canal at the water control structure then just go up, around , and back down into the water. The worst part is on the River side of the structure.
If you want to ride the Hernando Marsh on Sunday the 7th after the Airboat show, then come on. A bunch of us are.
I live off Turner Camp Road by the Brogdan Bridge.
Bob