First named the "William P. Snyder" this vessel was built as a bulk carrier by the Great Lakes Engineering Works of Ecorse, Michigan two years prior to the introduction of the Model T Ford. Launched in February of 1906 she is the oldest commerical ship still employed in trade on the Great Lakes. In 1950, her original triple expansion steam engine was replaced with a Skinner Marine Unaflow model rated at 3,500 i.p.h. In 1966, Manitowoc Shipbuilding of Manitowoc, Wisconsin converted her to a cement carrier. Over the years she has had several owners and name changes including:"Elton Hoyt II", "Alex D. Chisholm", "Medusa Challenger", "Southdown Challenger", and currently "St. Marys Challenger".