Did you happen to read the article in last months Iowa Sportsman, by Johnnie Craine?
Alot of people in this area (along with Johnnie) complain that the DNR keep the lake levels low for the duck hunters, making it hard for the fisherman to get anywhere back in there. Usually it is so low in the summertime it's not even worth trying.
I am suprised that you got in there. I believe they also had a levee break somewhere down there too. Maybe now is the perfect time to hit it, while the water is up. It's been a few years since i have fished it. Only about 15 miles from home, so maybe i should give it a try again.
Care to share some GPS coordinates? LOL.