The SS Hydrus was an American steel-hulled Great Lakes bulk freighter, constructed in 1903 and launched as the R.E.

[2] The Hydrus foundered and sank with a crew of twenty-four aboard on or around 8 November 1913[3] while heading for the St. Clair River.

The James Carruthers was also lost in the storm as well as the SS Argus, which was the sister ship of the Hydrus.

The wreck of the Hydrus was located in the summer of 2015 by a team of shipwreck hunters led by David Trotter.

The holds still contain iron ore, and the pilothouse is intact, complete with the ship's wheel and engine-room telegraph.