I'm no expert on your side of the line (Or mine for that matter), but here's my $0.02.
I think that Geese, Mallards, and Woodies will dominate your area (As you have probably noticed). Just about everything will come through the state, but some of the species will come through in numbers that you won't notice.
This link shows a map of banded ducks that were harvested (and reported) in Indiana from 1937-2005. In 68 years only 20 pintails have been reported, while 1,806 Mallards have.
http://www.ducks.org/media/Indiana/IN%2 ... anding.pdfThis is a map of IL band returns for comparison.
http://www.ducks.org/media/Illinois/IL% ... MedRes.jpgThere is a huge difference in the ammount of bands reported, but that doesn't necessarily mean anything. We would have to look at actual harvest reports. If we assume that the number of bands reported correlate to the numbers that are actually harvested, my guess is that there are a lot of the potential IN birds that find the Mississippi, and never make their way over to you. The "heart" of any flyway "should", in my opinion, see more birds than the outskirts of each flyway. This is will contribute to you seeing mostly local ducks (Mallards), and less of the others.
So, to answer your question after babling for a while, on any given day you will have the opportunity to most any bird that's out there, but the chances of seeing most of them are slim.
Count on Mallards, Woodies, and Geese. If or when something else comes along you'll be in for a pleasant surprise.