Medusa Cement Co.

The St. Marys Challenger sails on the Calumet River in Chicago. (Credit: Bob Roberts)

St. Marys Challenger Makes Possible Final Voyage To Chicago

The St. Marys Challenger, better known to Chicagoans of the Baby Boomer generation as the Medusa Challenger, arrived shortly after 4 p.m. Monday, loaded with powdered cement loaded in Charlevoix, Mich.