There is a lot of public land in Iowa and the best way to find out where it is is to get an "Iowa sportsman's atlas". It has map of every county in the state and all of the public land posted in it. When i say all public land I mean it has all campgrounds,lakes,public hunting,river accesses and contact infromation for every DNR officer in the state. Also it has numbers for hotels. I am pretty sure there is the same thing for the other states too.