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Ecosysem Restoration as Infrastructure–MRGO Part 5

 

Closure Structure at Bayou la Loutre

Closure Structure at Bayou la Loutre

The construction company building the closure will barge stone down the Mississippi River through Baptiste Collette near Venice, travel across Breton Sound, and access the MRGO from the east.  The company had to take this route because the Inner Harbor Navigation Canal  gives barges access to MRGO from the Mississippi and  the canal is closed, because the Corps is enlarging its lock.

The engineers will reconnect the ends of  the Bayou la Loutre ridge across MRGO with a closure dam 1,450 feet long and build on top of it. This offers the most stable substrate. Even so they expect a great deal of settlement into the soft coastal soils. 

The top of the closure will be 25 to 30 feet wide with a bottom width of 250 to 275 feet and would rise 5 feet above mean sea level.

Construction is expected to take 170 days and be completed by June 2009, in time for the hurricane season. Most of the work will be done May through September when Gulf sturgeon are in the rivers and not the estuaries.

The Feds will pay the total cast. The State of Louisiana the Operation and Maintenance over its 50-year life span.

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