Ditto on the Lehigh, I fish the gorge area quite a bit. Have almost slid off the edge of boulders a couple of times now into some deep fast water. Usually stick to the easy to wade spots, or don't really venture out too far into the water much anymore. Just bought an 11 ft nymph stick for the Lehigh, to help get that little bit of extra reach.
Did see an old timer cross the section a mile or so above White Haven and proceeded to work his way downstream fishing every pocket and hole on the other side of the river...I was pretty impressed as I would've likely fallen multiple times given the water was moving pretty quickly.
I'd second the Brodhead though too...for some reason I just tend to slide around way too much. Just fell in about two weeks ago too while attempting to turn around and head back to the bank...