1872
1872: On 12 December 1872, the Port Huron Times listed the following vessels at winter lay-up at Sarnia, Ontario: Schooners: MARY E PEREW, KINGFISHER, UNADILLA, ONEONTA, AMERICAN, J G MASTEN, PELICAN, UNION, B ALLEN, and CAMDEN; Brigs: DAVID A WELLS, WAGONER, and FRANK D BARKER; Barks: C T MAPLE, EMALINE BATES, and D A VAN VALKENBURG; Steamer: MANITOBA.
1877
1877: On 12 December 1877, U.S. Marshall Matthews sold the boiler and machinery of the CITY OF PORT HURON at auction in Detroit, Michigan. Darius Cole submitted the winning bid of $1,000.
1898
1898: The wooden passenger and freight carrier SOO CITY sank at the dock in Holland, Mi after bucking ice while inbound.
1898: On 12 December 1898, FANNY H (wooden propeller tug, 54 foot, 16 gross tons, built in 1890, at Bay City, Michigan) was sold by J. R. Hitchcock to the U. S. Army Corps of Engineers. She underwent a major rebuild in 1908, when she was lengthened to 60 feet.
1898: On Monday December 12, 1898, the AURORA was fast in the ice at Amherstburg, Ontario, when a watchman smelled smoke. The crew tried to put out the fire, but to no avail. They were taken off the burning vessel by the tug C A LORMAN. The ship burned to the water’s edge, but was salvaged and rebuilt as a barge.
1917
1917: On this day December 12, 1917, the stern wheeler RAPIDS was crushed by ice at Paducah, Kentucky. Her on board crew of two survived. The Great Lakes has claimed many vessels by crushing them in ice, but it does occur to the south, just not nearly as often.
1925
1925: SIR THOMAS SHAUGHNESSY stranded on a rocky shoal inside the breakwall at Fairport, Ohio. Hull repairs were listed at over $18,000.
1942
1942: SPINDLETOP, e.) BADGER STATE was launched December 12, 1942, for the United States Maritime Commission.
1956
1956: On December 12, 1956, the once-proud passenger vessels EASTERN STATES and GREATER DETROIT were taken out onto Lake St. Clair where they were set afire. All the superstructure was burned off and the hulls were taken to Hamilton, Ontario, where they were scrapped in 1957.
1966
1966: AMBROSE SHEA, a new Canadian carferry, was hit by a flash fire while under construction by Marine Industries Ltd. at Sorel, Quebec, and sustained over $1 million in damage. Completion of the vessel was delayed by 3 months before it could enter service between North Sydney, NS and Argentia, Newfoundland. The ship arrived at Aliaga, Turkey, for scrapping as d) ERG on June 22, 2000.
1972
1972: SIR JAMES DUNN went aground in the St. Lawrence near the Thousand Islands Bridge while enroute to Sorel with grain.
1972: The push tug PRESQUE ISLE was launched December 12, 1972, as (Hull #322) by the Halter Marine Services, Inc., New Orleans, Louisiana.
1975
1975: WHEAT KING returned to Port Weller Dry Docks on December 12, 1975, for lengthening to the maximum Seaway size of 730 feet overall for the iron ore and grain trade, thus ending her salt water activities.
1987
1987: One unusual trip for the WOODLAND occurred when she arrived at Toronto, Ontario on December 12, 1987, to load a 155-foot, 135-ton self-unloading unit for delivery to the Verolme Shipyard in Brazil, where the Govan-built Panamax bulk carrier CSL INNOVATOR was being converted to a self-unloader.
1990
1990: CLIPPER MAJESTIC was abandoned by the crew due to an engine room fire off the coast of Peru. The vessel had been through the Seaway as a) MILOS ISLAND in 1981, MAJESTIC in 1989 and was renamed c) CLIPPER MAJESTIC at Toronto that fall. The damaged ship was towed to Callao, Peru, on December 13, 1990, and repaired. It also traded inland as d) MILLENIUM MAJESTIC in 1999 and was scrapped at Alang, India, as e) MYRA in 2012.
2009
2009: The Canada Steamship Lines bulk carrier SPRUCEGLEN (ii) went aground near Sault Ste. Marie and had to go to Thunder Bay for repairs.
2010
2010: The tug ANN MARIE sank in the Saginaw River while tied up for the winter. It was salvaged a few days later.
2022
2022: The saltwater vessel Patagonman ran aground below Cote St Catherine Lock in the Seaway on December 12, 2022 due to engine trouble. All traffic was stopped until the Groupe Ocean tugs Ocean K. Rusby and Ocean Pierre Julien arrived to pull her free in the evening, after which docked at Baillargeon Pier. Marine Traffic lists the 2019-built vessel, formerly named San, as owned by Polish Shipping Co. (POLSTEAM).
Data from: Skip Gillham, Joe Barr, Dave Swayze, Jody Aho, Gordon Shaw, Max Hanley, Ahoy & Farewell II and the Great Lakes Ships We Remember series.

