A U.S. government agency is being sued over its decision to allow a proposed mine outside the vast Okefenokee National Wildlife Refuge to move forward without federal permits.
The saltwater is threatening drinking water supplies in the New Orleans metro area. The U.S. Army Corps of Engineers built an underwater levee to stop the intrusion.
Arkansas officials said it had the potential to become a "catastrophic event," adding, "The bridge was closed to vehicular traffic and the river was closed to barge traffic as a safety precaution."
