Well, as you probably know, weather, cold weather, is the trigger here. Extended periods to freeze over large areas of the river. And we have not had that here in our region. I'm 90 miles away in north central Illinois. Looking at extended forecasts, cold weather is predicted but...?
I generally say the last of January/ first of February is the best "guessing period". I, personally, have not been to 15. 14, the last 2 years, has given me all the eagle shots I can handle!
If you pick a time, feel free to pm me for what info I may be able to provide.