The marsh boundary separating Lake Borgne and the MRGO
has undergone both interior and shoreline wetland losses due
to subsidence, impacts related to construction and use of the
MRGO (i.e., deep draft vessel traffic), and wind-driven
waves. Although much of the project area is protected from
edge erosion by shoreline protection measures, and since
2009, the MRGO has been deauthorized for deep draft
navigation and maintenance, interior wetland loss due to
subsidence continues to cause marsh fragmentation and pond
enlargement. Wetland loss rates in the project area are
estimated to be -0.60 percent a year based on USGS
The proposed project will create and nourish 634 acres of
marsh using dredged sediment from Lake Borgne. Existing
high shorelines along Lake Borgne, remnants of previous
containment dikes and marsh edge, would be used for
containment to the extent practical. Constructed containment
dikes would be breached/gapped as needed to provide tidal
exchange after fill materials settle and consolidate. The
project would create 346 acres of marsh and nourish at least
288 acres of existing fragmented marsh. A target fill
elevation of +1.2 feet is envisioned to enhance longevity of
this land form. Additionally, 187 acres of vegetative planting
will occur within the newly created areas. Due to the
presence of existing banklines, dredged slurry overflow
could potentially be discharged immediately adjacent to the
project polygons, resulting in nourishment of additional areas.
This project is located in Region 1, Pontchartrain Basin, South Lake Borgne Mapping
Unit, St. Bernard Parish, north bank of the Mississippi River
Gulf Outlet (MRGO) in the vicinity of Shell Beach.
This project is on Project Priority List(PPL) 24.
The Shell Beach South Marsh Creation project sponsors include:
During the month of May, we recognize and celebrate the various ways that wetlands enrich the environment and people. American Wetlands Month is a time to celebrate why wetlands are indispensable to the ecological, economic, and social health of our country. It is a full month to encourage both communities and individuals to actively participate in the planning, protection, and restoration of our wetlands. The United States Environmental Protection Agency (EPA) partners with other federal and private partners in celebration of American Wetlands Month each May. These organizations schedule events throughout the month of May to engage those who are striving to better understand the value of wetlands to our country.
An entire month dedicated to American Wetlands speaks volumes on how valuable this natural resource is, although it is among the least understood. Wetlands help improve water quality and supply, reduce flooding, and provide critical habitat for plants, fish and wildlife. Government regulations and zoning restrictions are not enough to protect and restore wetlands alone. Americans must also participate in these efforts to save our wetlands.
History of American Wetlands Month
In 1991, American Wetlands Month was created in effort to celebrate the importance of wetlands and educate Americans about the value of this natural resource. A wide range of individuals with ties to wetlands participate in events and celebrations throughout the month of May to increase awareness of the benefits wetlands provide with hopes of inspiring people to work year-round to protect and expand our wetlands.
Explore Wetlands Around You!
Wetlands are present in all 50 states. It is likely that a wetland exists nearby for you to explore and increase your education during American Wetlands Month and throughout the year. Take some time to learn about wetlands and ways to protect the wetlands around you!
The goal of building terraces is to achieve some of the same objectives as full marsh creation but over a larger area of open water, where marsh creation alone is not feasible. Terraces are long, earthen berms that are built by mechanically dredging material and piling and shaping the material to a desired height. Most terraces average around 3 feet tall, with shallow side slopes and a wide base. This size and shape optimize the amount of terrace that falls in the intertidal zone and will support wetland vegetation.
The objectives of constructing terraces are several and depend upon the location in which they are built. These include acting as a sediment trap to help build new land, reducing wave fetch and erosion on adjacent marsh shorelines, creating habitat for fish and waterfowl, and improving water quality to promote the growth of aquatic vegetation. Terracing projects constructed under CWPPRA have achieved each of these goals, with sediment trapping being most evident near the openings of sediment-laden bays or navigational waterways.
Terracing has become a widely used technique that is expanding across the Gulf Coast because of the success and cost-effectiveness demonstrated through CWPPRA and privately funded projects. Although these features may not look like natural marsh and often use geometric configurations, they are able to perform a lot of the functions of natural marsh in areas that have become vast open water. Developing this cost-effective technique for use in areas that have few other restoration options is a testament to CWPPRA’s ability to adapt to funding constraints and a quickly changing environment.
On April 1st residents of Lafourche Parish and places farther afield had a sunny and windy day to celebrate the 4th Annual Leeville Art & Heritage Festival in Golden Meadow, LA. Organized by Launch Leeville, this festival works to highlight changes in the landscape and community around Leeville as processes like subsidence, erosion, and sea level rise convert land to water. Staff from the Coastal Wetlands Planning, Protection, and Restoration Act, and other exhibitors such as the Coalition to Restore Coastal Louisiana, were present to talk about the causes of land loss and options for protecting and restoring what remains. In addition to live music, craft vendors, and a shrimp boulette competition, festival-goers could learn about coastal restoration projects, see Houma basket weaving demonstrations, and participate in a fishing rodeo.
Leeville sits along Bayou Lafourche and Louisiana Rt. 1, two geographic features that have witnessed a number of CWPPRA projects, from the West Belle Pass Headland Restoration (TE-23) project, which created new marsh and stabilized shorelines to the south of Port Fourchon, to the GIWW to Clovelly Hydrologic Restoration (BA-02) project, which increased freshwater availability to prevent higher salinity levels which could damage local vegetation. Another CWPPRA project, East Leeville Marsh Creation and Nourishment (BA-194), is currently in engineering & design and would provide increased southeastern protection for Leeville from weather and tides. Preserving the livelihoods and heritage of small communities like Leeville requires both protecting their physical setting and giving them the time and space to develop strategies for a changing future.
Barrier islands are known as coastal Louisiana’s first line of defense against destructive storm surge. These islands are a unique composite of beach, dune, marsh, and sand flats that host a tremendous variety of fisheries and wildlife, including endangered species. Barrier island restoration projects are designed to protect and restore the features unique to Louisiana’s barrier island chains. This type of project may incorporate a variety of restoration techniques, such as the placement of dredged material to increase island height and width, the placement of structures to protect the island from erosive forces, and the placement of sand-trapping fences, used in conjunction with vegetative plantings, to build and stabilize sand dunes.
Responsible for the majority of Louisiana barrier island restorations to date, CWPPRA has led the charge in barrier island restoration because it recognizes the ecological importance of barrier islands and their critical role in the defense of coastal Louisiana.
Historic and current ridge habitat loss occurs in the form of subsidence and shoreline erosion along Bayou La Loutre. The shoreline erosion is caused by increased boat traffic diverted due to the closure of the MRGO channel. Ridge habitat consists of Live Oak Hackberry Maritime forest which is utilized by trans-gulf migratory bird species as a first and last stop when crossing the Gulf of Mexico. This critical habitat is rated as S1-Most Critically Imperiled (State Natural Heritage Program) and S2 priority by the state of Louisiana. Interior marsh loss along Lena Lagoon is caused by subsidence, sediment deprivation, increased wave fetch and construction of access and navigational canals. The integrity of the Lena Lagoon shoreline has been breached, and loss of this wetland buffer will expose the La Loutre ridge to highly erosional winter storm events.
The goal of the project is to create an approximately 31.7 acre ridge feature with material from bucket dredging Bayou La Loutre. Additionally dredged material from Lake Borgne will create 163 acres of marsh and nourish approximately 258 acres of marsh along Lena Lagoon (421 acres total).
The proposed project will create approximately 5.46 miles (28,855 ft) of ridge along Bayou La Loutre and 24.4 acres of Live Oak/Hackberry Maritime forest habitat. The ridge habitat will be built centerline along the bank of the bayou. The structure will have a +4 elevation with a 5:1 slope on the bayou side and 3:1 slope on the marsh side. Additionally the newly created ridge will include herbaceous and woody plantings with smooth cord plantings along the toe. The Lena Lagoon site will create and nourish approximately 421 acres of marsh using sediment dredged from Lake Borgne. Lena Lagoon will have a semi-confined south and east flank and a fully confined north flank. Containment will be degraded as necessary to re-establish hydrologic connectivity with adjacent wetlands.
This project is located in Region 1, Lake Pontchartrain Basin and Breton Basin, St. Bernard Parish.
This project was approved for Phase I Engineering and Design in January 2017 and is on Priority Project List (PPL) 26.
The Bayou LaLoutre Ridge Restoration and Marsh Creation project sponsors include:
Louisiana’s shorelines are eroding at a drastic pace, some at rates up to 50 feet per year. The fertile but fragile soils found in the wetlands are susceptible to wave energy. As land is lost, water bodies merge together, which can increase wave fetch and shoreline erosion. Behind these shorelines lie communities, highways, and infrastructure that are at risk of washing away.
Various techniques to defend the coastline have been tested and applied under CWPPRA. Rock revetments, oyster reefs, concrete panels, and other fabricated materials have been constructed along otherwise unstable shorelines to abate wave energy and reduce erosion. These structures are designed to break waves, and they often trap waterborne sediments behind the structures that, over time, can become new land.
Through the course of the CWPPRA program, advancements have been made in shoreline structures that have helped maintain natural processes while providing critical protection. Such advancements have included using lighter-weight materials that require less maintenance and can be constructed on organic sediments. Other advancements include low-relief structures that are designed to trap sediments and natural breakwaters such as reefs that can self-maintain and support other ecological functions. Other natural shoreline protection measures include vegetative plantings, whose roots help secure soils and can promote accretion. These projects are implemented with consideration for minimizing impacts to the surrounding environment. Although some shoreline structures may look foreign in a natural landscape, they are necessary features that physically protect communities and hold wetlands in place by mitigating the harsh forces that move to destroy them.