High Quality Content by WIKIPEDIA articles! The fourth USS St. Louis, Cruiser No. 20 (C-20), was the lead ship of her class of protected cruisers in the United States Navy. St. Louis was launched on 6 May 1905 by Neafie Levy Company, Philadelphia, Pennsylvania; sponsored by Miss Gladys Bryant Smith; and commissioned on 18 August 1906, Captain Nathaniel R. Usher in command.