Mark, We are also planning on making the trip to the river to photo Bald Eagles sometime in January. Here is a great link for information on all the lock and dams, their updated bird counts, the dates of their eagle festivals, and even their phone numbers!
http://www.mvr.usace.army.mil/missri...gle%20Main.htm
It appears they update the count each Wednesday. In the past, we found Lock and Dam 18 which is across from Burlinton, IA, to have the most birds, although that is not the case as of December 9, this year, but it is still too early in the season to tell. Daughter and I went there a couple of years ago and it was wonderful.