I wanted to let everyone know that I just completed a library of topo maps which includes maps of all 6000+ lakes/rivers in the State of Iowa. You can also make maps for any location in the state (rivers, reservoirs, streams, etc.) by clicking on the Map Creator Link which is the second link. Click the TOPO tab and double click on the map to zoom in on each map.
Iowa Lakes:
http://www.myfishmaps.com/topo-maps/US-fishing-locations/Iowa/
Map Creator:
http://www.myfishmaps.com/topomaps/mapcreator.php
Enjoy using these maps – I hope they help with your fishing trips.