CSS Grampus, a 252-ton stern-wheel river steamer, was built in 1856 at McKeesport, Pennsylvania, for civilian employment. Taken over by the Confederate Army in early 1862, she served as a transport and gunboat on the Mississippi River. Grampus was scuttled off Island Number Ten on 7 April 1862 when that fortification surrendered. However, she was apparently raised by Union forces and was probably destroyed by fire on 11 January 1863 under the name Grampus No. 2.