USS Shiloh was a single-turreted, twin-screw monitor that was slated to enter service with the United States Navy.

[1] Though the original designs for the Casco-class monitors were drawn by John Ericsson, the final revision was created by Chief Engineer Alban C. Stimers following Rear Admiral Samuel F. Du Pont's failed bombardment of Fort Sumter in 1863.

It was discovered that Stimers had failed to compensate for the armor his revisions added to the original plan and this resulted in excessive stress on the wooden hull frames and a freeboard of only 3 inches (76 mm).

On 25 June 1864, the Navy Department ordered Shiloh's builder to raise her deck to give her sufficient freeboard, then on 17 June 1865, after the end of the Civil War had prompted an American naval retrenchment, work on Shiloh was ordered suspended.

[1] This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.