Wade fishing is pretty tough in the N. Branch, but it is due to the bowling ball sized rocks that are very slippery, not so much the flow. I'd suggest fishing the lower catch and release stretch, cause it holds a lot of hold over trout and stocked fingerlings. The upper stretch holds more fresh stockers in my opinion. If you hook into a large rainbow, shaped like a football, with no color, and a tiny head and tail. It is most likely a West Virginia Institute Bow, which is genetically altered to grow really fast. They are fun, but I consider them mutant bows.
I emailed the Maryland Biologists earlier this year, and they advised that the cutthroat stocking program has been restarted, as of last year 2011, and I've caught a few each time I've been out this year. Good Luck and have fun exploring that water.