Why does saltwater travel up the Mississippi River?

This video discusses the saltwater intrusion from the Gulf of Mexico that travels upstream into the Mississippi River.

A discussion of the sill that is built in the river at Myrtle Grove, Lousiana is discussed. Impacts to drinking water facilities and farm land that is irrigated by Mississippi River water is presented. The barging of the water to water treatment facilities is for trying to get the treated water to acceptable salinity levels.

This video presents the reason why salt water travels up the Mississippi River and what is the source of the river. A discussion of sea level and the river channel being below sea level is discussed.

The video answers the question, "How far upstream until the bottom of the Mississippi River channel is at sea level?"

It also answer the question, "How much Mississippi River flow is needed to push the salt water downstream?" or "How much Mississippi River is needed to push the salt water back?"

The video answers the question, "How many times has the sill been built in the Mississippi River?"

The video answers the question, "Does the Mississippi River sill completely block the salt water intrusion?"

The video also answers the question, "How far has the salt water wedge moved up the Mississippi River?"