The Mississippi River has been closed temporarily as contractors placed a pipeline in the Mississippi River to build an underwater barrier that the Army Corps of Engineers says will stop the advance of salt water threatening drinking water in the New Orleans area.
Due to low water levels in the Mississippi River, salt water has been moving far upriver and was at the outskirts of New Orleans by Wednesday, reaching 89 miles north of the mouth of the Mississippi.
Louisiana has so far avoided disastrous drought conditions declared in nearly half the counties in the United States. But southeast Louisiana is starting to feel the effects of a lower Mississippi River.
With the Mississippi River running at low levels, salt water is moving up from the Gulf of Mexico.
The Times-Picayune reports that denser, heavier saltwater flows upriver beneath fresh water flowing downstream when the river's flow drops below normal. The Army Corps of Engineers says salt water is not yet considered a threat to water supplies in the New Orleans area.