I'm glad you said that as I've noticed the same thing in this area. When I moved to this area, mid `80's, there were enough ducks to keep it interesting, from Pool 16 thru 18. I hunted hard up to `94, always having enough shooting. I haven't drawn a blind since, due to bad luck and other committments. After doing little waterfowling, i tried to get back into it, after getting a lab in `97. A combination of few ducks and the hassles of jumping a blind ended my hunting in Pool 16. I did have a little success in Pool 18 for several years, but it seems to be dropping in quality now, too.
For the past dozen years or so, I don't even see many ducks working the fields, from the Quad Cities to Keithsburg. In 2004, I hunted with a guy in Pool 18. We went 12 times, from 1 Nov. to Thanksgiving, and did not see ONE DUCK! It wasn't just us, either. In talking to other hunters at the ramp & listening for shots, we found that everyone was experiencing similar luck.
I have friends in Iowa who say the ducks aren't coming this far east, but going down the Missouri River, instead. One, an Iowa GW, says he sees more ducks on his annual week-long trip to western Iowa than he sees on the Miss all season.
I can't say where they are going, or if the record flights even exist...except on paper, but they sure don't use the Miss, at least from Andalusia to Oquawka.
Semper Fi, Marines
Casey 1997-2011 RIP