I can't speak for this year but I was on Ada creek last year, in a light solo. From my expierence you will have to portage most, if not all, of Ada Creek. It is a swampy knee/foot sucking, rock hopping portage, but it could be worse. Just smile as you're doing it. :-)
May the rivers be crooked and winding, and your portages lonesome, leading to the most amazing view.
Cherokee Creek is deep and always paddle worthy. When water is high on Ada Creek, the portages are shorter. When water is low, the portages get longer with more mud exposed, but the paddling sections are almost always doable. Same with the Temperance River if you're talking from South Temperance down to Baker. It has not been drought conditions to dry things out that bad, and they just had some good rains.
"What could happen?"