That sure looks like Flint Creek...
That's the Buffalo, and it's really the only bit of somewhat tricky water I've found in the middle section. And man did I find it. That entire black skirt was under water and it was rushing over it.
I could have gotten through easier, but I was trying to test the limits of the boat. I saw some standing waves and went for them just to see what would happen; now I know. It's great for Class I stuff, which is most of the fishing I do. I'd rather have the comfort than the whitewater capability for a fishing boat.