MorganzaNo Date Set For Morganza Spillway Opening

On June 6, the U.S. Army Corps of Engineers announced it would not operate the Morganza Spillway, or Floodway, on June 9th. The Corps also said  it did not have an expected operating date. Operation of the structure will be a consideration until the Mississippi River crests and begins to fall. The expected crest at Morganza on or about June 15, but it will then remain high for two weeks or more.

For the latest updates about the opening of the Morganza Floodway  click here.

About The Floodway

The Morganza Spillway has been opened twice (in 1973 and 2011) Since its completion in 1954.

It built to o divert excess floodwater from the Mississippi River into the Atchafalaya Basin. The floodway consists of two structures – the Morganza Control Structure and the Morganza Floodway – which are designed to pass up to 600,000 cubic feet per second (cfs) of water to the Gulf of Mexico, alleviating stress for mainline levees downstream along the Mississippi River.

Located at river mile 280 in central Louisiana, the Morganza Floodway begins at the Mississippi River, extends southward to the East Atchafalaya River levee, and eventually joins the Atchafalaya River Basin Floodway near Krotz Springs, Louisiana. Seven design plans were originally proposed, and a two-structure design was selected, according to the U.S. Army Corps of Engineers. The first component at Morganza is the floodway. At twenty miles long and five miles wide, it consists of a stilling basin, an approach and outlet channel, and two guide levees. The second element is a control structure containing a concrete weir, two sluice gates, seventeen scour indicators, and 125 gated openings.

The decision to open the Morganza Floodway relies on current and projected river flows and levee conditions, river currents and potential effects on navigation and revetments, extended rain and stage forecasts, and the duration of high river stages. When river flows at the Red River Landing are predicted to reach 1.5 million cfs and rising, the Corps considers opening the Morganza Floodway.

For more information visit: https://www.mvn.usace.army.mil/Missions/Mississippi-River-Flood-Control/Morganza-Floodway-Overview/

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