The easy way to find any particular map is just to do a search for it. http://indianainfo.net/newforum/index.php?action=search
Make sure to use the word "map" in your search terms.
For example if you wanted to search for any lake. Let's take Morse reservoir as the example.
DO NOT SEARCH AS: MORSE RESERVOIR
SEARCH AS: MORSE RESERVOIR MAP.
You'll get lots better search results by doing it this way.