The U.S. Army Corps of Engineers, New Orleans District began construction of an underwater sill Oct. 11 across the bed of the Mississippi River channel to prevent further upriver progression of salt water from the Gulf of Mexico.
The Mississippi River’s volume of water has fallen to a level that allows salt water to intrude upstream. Salt water from the Gulf of Mexico moves upriver in a wedge shape that may stretch up approximately 20 miles from the bottom to the surface of the river.To stop the salt water from moving upriver and reduce the risk to freshwater intakes, the New
