Sam,
Where on the river are you trying to fish? My wife is from West Point and grew up on the river. Her grandparents have a big house out there on the water. Around the West Point area, we catch good size blue cat's, croaker, sometime's spot. It all depends on how much rain there has been. Down near the big bridges you can catch resident rock fish. Croaker fishing is good there also. I've even heard of people catching some cobia up near there, but I've never seen it. As you go further up river the water is more fresh. I've had luck catching bass in some of the small creeks, had to take my little jon pretty far back into the creek. I know this one creek that looks small, but actually is much bigger once you get up in there. Water is like 6-8 feet deep durring high tide, enough to take a bass boat. Only problem you have is a low hanging bridge. about 3 feet off the water, you have to duck to get under. My not so secret spot anymore. Further up near rainbow acers, you start to see lilly pads. I've has some sucess and caught some nice bass off the pads. There are also a lot of fallen trees along the shore line in that area. I've never really fish any further up such as Walkerton so I wouldnt be able to give any input about that.