John boat, seen at the Old Time Music Ozark Heritage Festival, West Plains, Missouri, June 15, 2012. This is a board boat (no plywood), which appears to be of modern construction, but the design is more traditional than most modern john boats. By stepping off and mostly guessing, I'd estimate the boat is about 20 ft long, 38-40" wide at the gunnels and about 14" deep. Rocker is about 9" (that is, the bottom lifts up about 9" towards the ends). The transoms are about 22-24" wide and 10-11" high, with 4-5" rake. The bottom boards run fore and aft.