I spend most of my river time on pools 4 & 7. Leaving the Buffalo Creek launch and going down river, within 150 yds. you'll see an old slate dump from the steam engine days when Butler Jct. was an interchange. Used to be a coal tipple there and a coal mine right above. Just off of that slate dump the water is 50' deep, and much of the channel downstream to and past the cove by River Forest you'll find water from 28' to 40' deep. The dredgers really ruined much of the structure all the way north from there. Just found out my oldest is out there right now. I texted him and he got a 17" eyeball at the cove on the first drop! Caution: spot burn.
Launching from Cowanshanok Creek on pool 7, if you go slightly down stream across the river there is a cove. We catch eyeballs, crappie, white bass, and the occasional musky in there and at the entrance from the river. Going north from there up to the high train bridge at the mouth of Pine Creek, there's deep dredged holes in the original channel. Walleyes! Fairly decent all along the west side up to #8 dam which has a power plant on the west side. 50' deep there, but across by the lock be careful. Rocks, and be prepared to tie a lot of knots; the snags are unlimited! You'll get eyeballs, catfish, and an occasional small mouth or musky too. When going down Cowanshanok Creek from the launch, stay on the right side of the bridge pier. Good fishing at times right at the mouth. Plenty of good parking at both those launches.