A few weeks ago a bunch of us went down and dealt with the jam on the upper Kenai. We were able to cut the main cottonwood out of there, and a number of other logs that were pinned in it. There is still one large cottonwood that is underwater, which we were not able to get to, so it is possible that something could get pinned under it and cause trouble, but right now it is free.
Someone else got there before us and tried to cut it out, but they lacked a saw with a long enough bar. One of the guys in our group brought a Stihl with a 36" bar on it (I think it said "Binford" on the side!), and made short work of the situation.
Keep in mind that the river could still jam on the submerged log or elsewhere. Caution is always in order whenever you are floating swift, narrow, blind channels!
We have a short article coming out on that in the newsletter, which should be hitting your inbox today. Also be sure to check out the details on the Alaska Raft and Kayak site, complete with photos.
And yes, we did have the permission and blessing of the authorities; it was coordinated by Tracey Harmon at Alaska Raft and Kayak. Kudos to ARK for getting 'er done!