Allmendinger was a wooden-hulled steam barge built in 1883, that ran aground during a storm on November 26, 1895, on Lake Michigan, off the coast of Mequon, Ozaukee County, Wisconsin, United States.

In May 1890 on White Lake near Whitehall, Michigan while waiting for a storm to pass and was freed by the steamer Hilton.

She eventually encountered a blizzard and was blown off course, grounding on a beach near Fox Point at around 3:00 A.M. She ended up about 500 feet (150 m) off Mequon, Wisconsin.

Allmendinger, which was driven ashore fourteen miles north of Milwaukee late in the season of 1895 and abandoned as a total loss, has at last gone to pieces and her timbers lie scattered along the beach.

From the time of her abandonment until well along in February the hull and upperworks remained intact and conveyed the idea to some the vessel might be rescued.

But the constant beating of heavy seas resulting from the prevailing easterly winds finally disintegrated the hull, and when the collapse came it was of the most complete description, every vestige of the steamer being wiped out in a single night.

Allmendinger were rediscovered in July 1934 by Max Nohl, Jack Browne, and Verne Netzow, who worked with a raft, homemade diving helmets and oxygen tanks to recover portions of the wreckage.