There are several
flood control systems on the Mississippi River. The
Bonnet Carre Spillway was built in response to the flood of 1927. Farther downriver, the Bohemia Spillway, started in 1924 and completed in 1926 just before the flood, was one of the earliest attempts to protect New Orleans from floods.
Diversion projects Several diversion projects have been planned and implemented since the beginning of 1990, not only for flood control but for marshland rehabilitation.
Caernarvon Freshwater Diversion The Caernarvon Freshwater Diversion, located south of New Orleans, was built in 1991 at a cost of $25.9 million around the site of the destroyed levee. The diversion was designed and constructed with five 15 feet gates, allowing up to 8000
cfs of river diversion to gravity flow into a conveyance canal. The canal runs to the Big Mar pond but also drains into Bayou Mandeville, Lake Lery, and the Delacroix Canal, which then flows into Oak River, and has created the Caernarvon Delta.
Davis Pond Freshwater diversion canal The success of the Caernarvon Freshwater Diversion, has led to the construction of other flood control structures including the $106 million Davis Pond Freshwater Diversion Structure. Construction began in 1997 and was completed in 2004 providing sediments and nutrients to the
Barataria Bay estuary ultimately benefiting 777,000 acres of marshes and bays.
Other projects In 1903
Bayou Lafourche was cut off from the Mississippi. In the 1950s a pumping/siphon station was installed delivering 200 cfs. The lack of fresh water affected the natural hydrology and allowed salt water intrusion that in turn affected drinking water. In 2001 the Bayou Lafourche Diversion design, phase I "Design Report, Mississippi River Water Reintroduction Into Bayou Lafourche" was approved to study a diversion project. This would result in a draft feasibility report, a continuation of the $1,000,000 report issued in September 1998, and the projects head work structure would be in
Donaldsonville,
Ascension Parish, providing a year-round flow of 1,000 cfs. The project was sponsored by the
U.S. Environmental Protection Agency, the
Louisiana Coastal Protection and Restoration Authority (CPRA) and run by the
U.S. Army Corps of Engineers. This part of the project has currently been "de-authorized". In March 2006 the
Final Phase 2 Design Report, Mississippi River Water Reintroduction Into Bayou Lafourche was published. In 2008
Hurricane Gustav was devastating to Bayou Lafourche. As a result of Hurricane Gustav, the CPRA implemented
The Emergency Bayou Channel Capacity Restoration Project. By November 2011 this project, that included dredging of Bayou Lafourche from
Donaldsonville to
Belle Rose. In 2012 the CPRA allocated $20 million to the Bayou Lafourche Fresh Water District, from the Coastal Impact Assistance Program, to implement State Project BA-0161 or "Phase 2", that is scheduled for completion in December 2016. Phase 2 includes of dredging between Belle Rose and
Napoleonville, ending just north of
LA 998. The project will increase the amount of fresh water into Bayou Lafourche, that will have a positive impact on the coastal wetlands by replenishing areas with a continuous supply of fresh water, and also by fighting the further encroachment of saltwater from the Gulf. As funding is obtained "post-Phase 2" will include dredging from Napoleonville to
Thibodaux and other components. ==Education==