The remains of the Civil War ironclad USS Chickasaw, which took part in the Battle of Mobile Bay in 1864, has been located near New Orleans. This article from the Montgomery Advertiser has the details.

http://hosted.ap.org/dynamic/stories/S/SOU_USS_CHICKASAW_ALOL-?SITE=ALMON&SECTION=HOME&TEMPLATE=DEFAULT

Regards

Erick