The closest contact with the Miss is Dubuque. I’ve never fished it much, since it’s only about 5 miles further to Guttenburg. Clinton and Davenport will take you at least another 1/2 hour, but can be worth it, especially if you’re catfishing. If you’re coming down in late spring, you might want to go somewhere where you can duck the powerboats and barges.
I spent the better part of my fishing thus far going after crappies and cats in Coralville and MacBride. MacBride has better numbers, but boats with >10hp motors get kicked off just as things are getting interesting (Memorial Day). You can still go out if you trailer the gas motor and use a kicker or an electric, but you’d better hope a stiff wind or a storm doesn’t come in fast. Both lakes are loaded with cats, but my experience is that C’ville turns off when the powerboats come out to play.