Latest saltwater wedge forecast released by USACE

Published Jan. 4, 2024

The U.S. Army Corps of Engineers, New Orleans District released today the latest Saltwater Wedge Timeline forecast of when water treatment facilities may be impacted by saltwater intrusion. 

USACE uses the National Weather Service 28-day Lower Mississippi River forecast, daily river observations and computer modeling to project the progression of the saltwater intrusion as it relates to the multiple municipal water treatment facilities along the river. 

Based on the latest forecast:

Chloride levels are expected to remain above 250 parts per million through 28-day forecast at:

  • Boothville

Not anticipated to experience chloride levels exceeding 250 parts per million at:

  • Port Sulphur
  • Pointe A La Hache
  • Belle Chasse
  • Dalcour
  • St. Bernard
  • New Orleans Algiers
  • Gretna
  • West Jefferson
  • New Orleans Carrollton
  • East Jefferson

The updated Saltwater Wedge Timeline is available on the New Orleans District website here:

The river conditions can be attributed to the augmentation of the underwater sill coupled with flows on the Mississippi River that remain above 150,000 cubic feet per second.  As a result of the sill augmentation and river flows, the toe of the saltwater wedge was lasted measured at river mile 63.3.

The forecast shows facilities upriver may not see impacts, but treatment facilities in Boothville continue to experience impacts from saltwater intrusion.


Matt Roe

Release no. 24-001