Great Lakes Patrol assigned to operate against criminals who were ravaging the logging industry. These so called timber pirates conducted illegal cutting of timber on federal land and then smuggled the valuable commodity out of the area in order to sell it. The areas most affected were in the western Great Lakes region, along the coasts of Michigan, Wisconsin, Illinois and Minnesota. Much of these forested areas controlled by the government were reserved for the building of new warships. The illegal timber trade centered on Chicago and Milwaukee. It was nearly as violent as the alcohol trade, which was carried out over the
SS City of Milwaukee navigation of the vessel took place. There is also a small pilot house on the stern that is used for docking the vessel. The ship was built in 1930 and launched in 1931 at Manitowoc, Wisconsin to replace , which sank with all hands on October 22, 1929 during a gale. Car ferry service had been introduced to the Great Lakes in 1892, and there was many as 14 vessels operating on the lakes at the system's peak. These specialized vessels were capable of carrying up to 34 railroad cars across the often stormy and ice-packed lakes at any time