At least twenty offshore oil platforms were missing, sunk, or had gone adrift, according to the United States Coast Guard. One oil rig, in dock for repairs before the storm, broke loose and hit the Cochrane/Africatown USA road bridge over the Mobile River in Mobile, Alabama. Two others went adrift in the Gulf of Mexico, but they were recovered. One platform, originally located 12 mi (20 km) off the Louisiana coast, has washed up onshore at Dauphin Island, Alabama. Shell Oil Company's MARS platform, producing around per day, was also severely damaged.