NEW ORLEANS —

The Army Corps of Engineers will begin to construct an underwater sill across the bed of the Mississippi River to help prevent upriver progression of saltwater from the Gulf.

According to the Army Corps of Engineers, the Mississippi River's volume of water has fallen to a level that allows saltwater to intrude upstream. Advertisement

Saltwater from the Gulf moves upriver in a wedge shape that may stretch up approximately 20 miles from the bottom to the surface of the river, according to the Army Corps of Engineers.

River conditions project that the toe of the saltwater wedge is expected to reach River Mile 80 above Head of Passes within the next 28 days.

The sill will take 28 days to create and will be constructed near Myrtle Grove.

The Corps constructed a similar unde

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