:Draft (hull) is a different term than depth.  I also doubt that the Fitzgeralds draft was 33 feet because she couldn't have locked at the Soo Locks at the time she was built.  MacInnis reported her draft at 27 feet (page 21).  Schumacher reported her draft at 25 feet (page 14).  Stonehouse (page 24) didn't give her draft but in reference to the period when the Fitzgerald was built, he wrote this, "Shipping is also restricted by lock and channel dimensions that hold the draft to about 26 feet and beam to 105 feet (for a 1,000-footer)."