Cross - A) Four Mile Grade Rd/170 to Six Hundred Road/FR166 (6.75 miles) (MN)
Approximate - nearest available gauge. Use as general reference only.
After something near 1.5 miles of rather uninterrupted flat water paddling, some gradient is encountered. Indeed, topos show something near 50' of drop in about a half mile. So, again, it is purely conjecture, but I'm guessing that someplace down through here, it's more than just class II or III. (Online aerial views are inconclusive.)