The Zidell Companies are a group of family-owned companies based in Portland, Oregon. They include Zidell Marine, a ship construction company which specializes in the building of barges, and Tube Forgings of America Inc. In the post-World War II era, Zidell became the largest shipbreaking operation in the United States. In September 2016, the company announced that it is preparing to shut down its barge-building business permanently and close its South Waterfront factory in 2017, with the last barge projected to be launched in spring 2017.