I live in the Quad Cities area (Davenport/Rock Island) area which is 2-1/2 hours west of Chicago and on the Mississippi and Rock rivers. There are several hot spots to hit in this area. You mentioned L&D 14 in Le Claire, IA as a location. That is always a safe choice especially if you plan on using a longer lens. You can also check L&D 15 in Davenport. Another good location is on the Rock River in Milan, IL. Not usually the numbers in Milan as on the Mississippi but that also depends on the amount of ice cover on both rivers. I shot over in Milan the last couple of days. Only 12 eagles at my location but they were active for the 1-1/2 hours that I was there so that made the trip nice. If we get a hard freeze in February (your timeframe) then the Mississippi would be the better choice, but again that depends on how much ice cover we get. Good luck on your visit and be sure to post your shots!
(Not a new member but I lost my username and password since my last visit a couple of years ago)