Salt water from the Gulf of Mexico has crept steadily up the drought-stricken Mississippi.
The steady creep of that saltwater wedge - which could threaten drinking water supplies in multiple Louisiana communities, undermine agriculture and prove corrosive to infrastructure - has left officials to scramble in an effort to slow down the encroaching sea.
Already this summer, Plaquemines Parish, where the Mississippi meets the Gulf of Mexico, has been forced to provide bottled water to thousands of residents, as the area struggles with boil water notices and a constant threat of saltwater intrusion. The bottom of the river, which has been heavily dredged, is lower than sea level until it reaches Natchez, Miss. That topography also makes it easier for salt water to flow along the river bottom, underneath the less dense fresh water.
Even as it works to enlarge the current underwater levee, the Corps said it would leave a “notch” in the sill - 620 feet wide and 55 feet deep - to allow oceangoing vessels to continue to transport cargo up and down the river.
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