(Wisconsin and Michigan Steamship Co., Sand Products Co., Port City Marine Services)
Founded in 2008, Port City Tugs Incorporated is based in Muskegon, Michigan. The company is one of two subsidies owned by the San Products Company of Muskegon, Michigan.
The company was established when the Sand Products Company replaced their self unloading River class ships.
The ships were acquired by the Wisconsin and Michigan Steamship Company subsidiary of the Sand Products Company. From the Oglebay Norton Marine Services Company in August 2006. With tugs modified to articulated tug and barges, and married with dry cargo barges.