Back channels, this time of year can be rather low with boulders and smaller rocks exposed. Quiet, almost stagnant pools remain where in the Spring and early Summer the water offered possibilities of life (insects and fish). But, if the flows are still there, give that back channel a look.
Often, in our haste to reach the main stem of the stream or river, we descend down the bank, wade through a back channel, move across an island and reach the main stem and stand and ponder the possibilities. Well, when the flows are there, you might stop sooner and study that back channel for possible insect activity, holding water and fish.
Steelhead, Salmon, Trout and Bass can be found in those back channels, which are really only small segments of the greater whole. My only caution is during certain times of the year those back channels are spawning areas too so rods off during those times.