There may not be any flatheads in there, but.....Try fishing it at night, they may come in there at night searching for small baitfish in that shallow water, throw a bluegill out there at night and see what happens, because if they are there you will eventually get one doing this. About the spoonbill tho, they eat plankton, so you really wont be able to catch them with bait, You will have to snag them if it is legal, thats how they catch them around here. Check your state regulations on doing this because it may not be legal in some states. Goodluck