If major obatructions are reported they usually put it on their website, the one for the forest for that river. Search 4 rivers lottery, do not choose any of the recreation.gov results, and go to the forest. If there are just annoying logs, I wouldn't expect them to pass that on.
We should be hearing something soon. Carverdog heard of some folks launching and quite a few others are doing so in a week.
You could also check the idahowhitewater yahoo group, that topic will likely be picking up soon as launch day approaches for many.
Living in Montana, boating in Idaho