Welcome to the forum!
As you can tell there isn't too many of us Iowans that browse often here. I'm also fairly new to the Des Moines area and have spent most of my time up at Big Creek in Polk City, which I haven't had much luck.
Another site for you to check out would be iowaoutdoors.org.
Those guys have a ton of information on different lakes, fish patterns, water temps..etc.