Walleye - Good: Catch walleyes shallow in the evenings casting jigs with plastics or live minnows near rocky shorelines and jetties. Fish deeper in 10 to 20 feet of water during the day casting jigs with live minnows or plastics or trolling live bait rigs.
Black Crappie - Good: Catch crappies that are in shallow near any wood habitat in 3 to 10 feet of water using live minnows or panfish plastics under a float. The best crappie fishing is going to be the first two weeks of May.
Source: Iowa DNR