PS Benjamin Franklin was a wooden sideâÂÂwheel steam paddle wheeler built in 1842 by Gilman Appleby in Buffalo, New York. She was owned by Hiram Burton of Buffalo and later by Henryâ¯W.â¯Walker of Detroit, and primarily carried passengers and packet freight (notably supplies for the Thunder Bay Island light and local fishermen).
The vessel measured approximately 135â¯ft in length, with a beam of about 20â¯ft, and registered at 231 gross tons. Her propulsion was provided by dual side paddle wheels, typical of midâÂÂ19th century Great Lakes steamers.
On Octoberâ¯8,â¯1850, while en route to resupply the Thunder Bay Island lighthouse, Benjamin Franklin was caught in a sudden storm and ran aground on the limestone reef at the southeast end of Thunder Bay Island. The vessel became stranded and began breaking apart. No lives were lost.
Following the grounding, much of the machinery was stripped ashore. A subsequent storm on Novemberâ¯28 washed away all remaining hull components, scattering wreckage along the shores and underwater.
Today, no intact hull remains. Machinery and hardware are widely scattered across depths ranging from 10 to 55 feet. Notable survivors at the site include: Two paddlewheel shafts lying on the lake bottom, each with castâÂÂiron hubs, one still containing portions of the original wooden spokes; One intact and two partially intact cylindrical boilers located in deeper water and a rudder and rudder post found closer to shore.
Diver access to various artifacts, including boiler fragments, steam machinery, and paddle wheel components, reveals the destructive effects of waves, ice, and currents on the shallow reef site.
GPS location of primary wreck artifacts is approximately Nâ¯45ðâ¯01.934â² Wâ¯83ðâ¯11.529â², with additional coordinates recorded for paddlewheel shards and boilers.