In New Orleans, parts of the Mississippi River are barely two feet high – its lowest level since 2012. The growing concern is over the dense salt water that travels upstream at the bottom of the river and could negatively affect industrial water supplies as well as ferry ships. That's where the Army Corps of Engineers comes in. They've started the process of breaking the wedge of salt water that's permeating the river. "The river is our lifeline," said Kirk Lepine, the president of Plaquemines Parish. The parish straddles both sides of the river, and while it has access to clean water, low water levels could impact residents.