Louisiana shifts to smaller river diversions after canceling multi billion dollar project

Governor Jeff Landry of Louisiana canceled the Mid-Barataria Sediment Diversion, a $3 billion project intended to restore coastal wetlands by funneling Mississippi River water into the Barataria Basin.

The state official halted the project in July 2025, arguing the massive diversion would damage the local commercial fishing industry by flooding the area with too much sediment and fresh water.

This decision followed the cancellation of a companion project, the Mid-Breton Sediment Diversion, which aimed to revive wetlands southeast of New Orleans. The Louisiana Coastal Protection and Restoration Authority (CPRA) is now shifting its focus toward smaller, less expensive projects. Budget documents show the state plans to spend at least $340 million on five smaller projects over the next several years.

One major project involves the Maurepas Swamp, where the state will install gates in the Mississippi River levee to channel water into the swamp. This project aims to flush out salty water and rebuild land across 45,000 acres. The state's new strategy draws inspiration from the Davis Pond Freshwater Diversion. Built by the U.S. Army Corps of Engineers in 2002, this project unintentionally built new land by carrying river sediment into the wetlands.

While some scientists argue that high nutrient levels in the river water may create weak vegetation, others point to the net gain of 1.3 square miles of land in the first 20 years of the Davis Pond operation. The CPRA plans to study how to optimize the flow of the Davis Pond diversion to maximize land building without washing away the new sediment.