Tinker's Creek

It's best to punch this suckah on the middle right, in IMHO. Alternatively, you can boof into the river-left eddy, butt that eddy tends to feed an undercut, and it has rocks flirting with the surface.
Downstream of this hole, only a few feet above the Tunnel entrance, is an ugly piece of rebar which can be seen at low water. Nobody's tangled with it...yet. Be warned, though.
Not too long after the river-wide hole is a river-wide strainer. Fun fun FUN!
You can even take this river-wide hole sideways. Lean hard downstream, and enjoy the ride as it typewriters you into the river-left shale bank. You'll scratch the bow of yer plastic boat, butt you'll do more damage to the fragile shale-face.