SS Iowa was a steamship built by the Western Pipe and Steel Company of San Francisco, California in 1920 for the U.S. government and was known as the SS West Cadron. It served in the Quaker Line subsidiary of the States Steamship Company. from 1928—when it was renamed the Iowa—until January 12, 1936, when it ran aground on Peacock Spit, Washington, part of the Columbia Bar at the mouth of the Columbia River.