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Why are dolphins at the heart of a Mississippi lawsuit?

Mississippi state leaders are suing the Army Corps of Engineers, alleging the corps’s decision to divert water from the Mississippi River as a flood prevention strategy for New Orleans led to countless dolphin deaths in the Mississippi Sound.

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Gerald Herbert/AP
Workers open bays on the Bonnet Carre Spillway, diverting water from the overflowing Mississippi River to Lake Pontchartrain in Norco, Lousiana, May 10, 2019.
  • By Emily Wagster Pettus Associated Press

| Jackson, Miss.

Opening a spillway as a flood-control measure in 2019 sent polluted fresh water from the Mississippi River into the Gulf of Mexico and killed bottlenose dolphins that live in saltwater, according to a new lawsuit.

Several local governments and business groups on the Mississippi Gulf Coast, calling themselves the Mississippi Sound Coalition, filed the federal lawsuit Monday against the U.S. Army Corps of Engineers.

The lawsuit argues that the Marine Mammal Protection Act requires federal agencies, including the Corps of Engineers, to obtain a U.S. Department of Commerce permit when their actions may disrupt the behavioral patterns of an animal such as the bottlenose dolphin.

“The massive volumes of polluted fresh water diverted through the Bonnet Carré Spillway and into the Mississippi Sound caused direct and indirect mortality of resident bottlenose dolphins,” the lawsuit says. “Many of the dolphins that did survive developed ... skin lesions.”

The lawsuit seeks a court order that would require the Corps of Engineers to comply with any obligation to obtain a permit before any further opening of the Bonnet Carré Spillway.

The Associated Press sent an email Jan. 24 to the U.S. Department of Justice, which represents the Corps of Engineers, seeking a response to the lawsuit. A spokesperson said the department declined to comment.

The Bonnet Carré Spillway is upriver from New Orleans. Opening the spillway diverts Mississippi River water to Lake Pontchartrain and Lake Borgne, after which it flows to the Mississippi Sound in the Gulf of Mexico.

When the river is high, opening the spillway eases pressure on the levees that protect New Orleans.

However, opening the spillway also carries pollutants and nutrients into the Mississippi Sound and reduces salinity. The result can be damage to oyster, fish and crab habitats, and algae blooms that affect marine life and beaches.

Mississippi Lieutenant Governor Delbert Hosemann has said the Corps of Engineers ignored its own procedures in opening Bonnet Carré Spillway in 2019, causing an environmental and economic disaster.

Robert Wiygul, one of the attorneys representing the Mississippi Sound Coalition, said the group and Mississippi leaders have no conflict with protecting New Orleans.

“We do have a conflict with the Corps of Engineers and the Corps’ position that the Mississippi Sound and our dolphins have to be sacrificed to prevent flooding,” Mr. Wiygul said in a statement Jan. 24. “We need to look for alternatives that can protect everyone’s interests, but the Corps refuses to even discuss them. The Mississippi Sound Coalition is working on win-win solutions that protect everyone.”

The new lawsuit is similar to one that some of the same coastal Mississippi governments and business groups filed in 2019 against the Corps of Engineers. The earlier lawsuit said the corps was required to consult with the National Marine Fisheries Service before opening the spillway.

In January 2023, U.S. District Judge Louis Guirola Jr. of Gulfport, Mississippi, ruled in favor of those who sued. The 5th U.S. Circuit Court of Appeals affirmed that ruling in June.

This story was reported by The Associated Press.

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