High Quality Content by WIKIPEDIA articles! USS Umpqua, a single-turreted, twin-screw monitor, was laid down in March 1863, before the official order had been placed, at Brownsville, Pennsylvania, by Snowden & Mason; launched on 21 December 1865; and completed on 7 May 1866. Umpqua was a Casco-class monitor intended for service in the shallow bays, rivers, and inlets of the Confederacy. These warships sacrificed armor plate for a shallow draft and were fitted with a ballast compartment designed to lower them in the water during battle to reduce the target they provided enemy guns.

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