Atchafalaya Sediment Delivery (AT-02)

A bucket dredge is shown removing sediment from a shoaled-in channel in order to help reestablish water and sediment flow within the Atchafalaya Delta.

Location

The project is located east of the lower Atchafalaya River navigation channel in the Atchafalaya River Delta, approximately 19 miles southwest of Morgan City, Louisiana, in St. Mary Parish.

Problems

Growth of the lower Atchafalaya Delta has been reduced as a result of maintenance of the Atchafalaya River navigation channel. Delta development in the shallow waters of Atchafalaya Bay is dependent on distributary flows and the diversion of sediments into over-bank areas through crevasse channels.

Because of the placement of material dredged from the navigation channel and sediment accumulation within the channels that decrease flow efficiency, the open crevasse channels are frequently short-lived. As riverflow through a crevasse channel is reduced, the amount of sediment that can be deposited in the delta is likewise reduced, resulting in decreased marsh development.

Restoration Strategy

The purpose of this project is to promote natural delta development by reopening two silted-in channels and using those dredged sediments to create new wetlands. Approximately 720,000 cubic yards of sediment were dredged from Natal Channel and Castille Pass in 1998. Over 12,000 feet of channel were reopened, and more than 280 acres of new habitat were created by the strategic placement of the dredged channels’ sediments. By reestablishing water and sediment flow into the eastern part of the Atchafalaya Delta, an additional 1,200 acres of new habitat are expected to be naturally created over the life of the project.

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Progress to Date

Construction was completed in 1998. A pre- versus post-construction habitat analysis using aerial photography indicated that, while there was an increase in land of 78.4 acres, the majority of the habitat created was represented by forested wetland (50.1 acres), while fresh marsh and upland barren habitats accounted for 14 acres gain each. Although many of the dominant plant species are present in both created and reference areas, the created areas contained different plant communities when compared to any time period in the development of a natural crevasse splay that served as a reference area for this project. Although the long-term effects on submerged aquatic vegetation (SAV) are unclear, habitat mapping indicated an increase in SAV habitat of 221.5 acres from 1997 to 1998, but this is very close to the increases that were reported in the project area pre-construction. Satellite imagery indicates that there have been significant increases in emergent acreage from 1998 to 2008.

This project is on Priority Project List 2.

The Federal Sponsor is National Marine Fisheries Service.

The Local Sponsor is CPRA.

Nutria Harvest for Wetland Restoration Demonstration (LA-03a)

Louisiana’s growing nutria population is detrimental to the state’s coastal marshes as the animals consume wetland plants that hold the soil together.

Location

This project was located throughout the coastal zone of Louisiana.

Problems

The nutria is a non-native, fur-bearing species in the rodent family that was introduced to enhance the Louisiana fur industry. Since the decline of the fur industry, nutria populations have increased tremendously along the coast. Because nutria voraciously consume marsh plants that help anchor wetlands, this non-native nutria population is now having a significant negative impact on coastal marsh health.

Restoration Strategy

The goals of this demonstration project were to determine if nutria meat for human consumption could be promoted and determine if a meat processing system promotional program could be developed. Meeting these goals would have facilitated nutria harvest through an increased meat demand. The project called for Coastal Wetlands Planning, Protection and Restoration Act funding matching that of participating meat-processing plants in order to compensate trappers for the nutria they harvest. The project also included monitoring selected coastal marsh areas by the Louisiana Department of Wildlife and Fisheries (LDWF) to assess both nutria damage and recovery resulting from this project.

Other components of the project included nutria meat recipe development and publication, along with an advertising and marketing strategy focused on increasing the public demand for nutria meat. The project was implemented by the LDWF with oversight by the Louisiana Department of Natural Resources and the U.S. Fish and Wildlife Service.

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Progress to Date

This demonstration project was approved by the Louisiana Coastal Wetlands Conservation and Restoration Task Force in April 1997. Through this project, LDWF has coordinated with consultants to develop and implement various nutria meat marketing activities.

Marketing activities included LDWF staff activities and contracting with consultants to: (1) develop and evaluate local, national, and international nutria meat market potential for human consumption; (2) develop a nutria meat marketing plan, including a Nutria Marketing Strategic Report which proposed various ways to encourage the public to eat nutria; (3) participate in festivals and chef’s competitions; (4) distribute nutria meat to the public through sales at grocery stores, restaurants, and other retail outlets; (5) determine nutria meat processing costs, product price structure, and potential meat production volume; and (6) plan promotional and advertising activities based on the Nutria Marketing Strategic Report.

The LDWF 1999, 2000, and 2001 nutria coastal damage surveys and reports indicated continued nutria-related marsh damages in the Louisiana deltaic plain at a level of approximately 100,000 acres per year impacted. Because of the January 2002 Task Force approval of the larger Coastwide Nutria Control Program (LA-03b), the LDWF discontinued providing incentive payments to trappers and conducting nutria herbivory surveys under this demonstration project. Those two items will be funded under the larger project. However, funding for nutria meat processors enrolled in the program, as well as nutria meat marketing activities, continued until the project was completed in October 2003. This project is on Priority Project List 6.

The project is on Priority Project List (PPL) 6.

The Federal Sponsor is US Fish & Wildlife Service.

The Local Sponsor is CPRA.

Approved Date: 1997
Project Area: N/A
Approved Funds: $0.80 M
Total Est. Cost: $0.80 M
Net Benefit After 20 Years: N/A
Status: Completed
Project Type: Demonstration: Herbivory Control

East Catfish Lake Marsh Creation and Shoreline Protection (TE-157)

Aerial view of marsh creation project in Terrebonne Parish.

Location

The project is located in Region 3, Terrebonne Basin, Terrebonne Parish.

Problems

Significant marsh loss has occurred east and south of Catfish Lake. Causes of marsh loss include the construction of numerous oil/gas canals, subsidence, and sediment deprivation. Between Catfish Lake and Golden Meadow Hurricane Protection Levee, very little marsh remains after the construction of an extensive network of oil/gas canals. Much of the remaining land in this area consists of spoil banks and isolated patches of marsh. From examination of aerial photography, the majority of this loss occurred during the 1960s and 1970s. Based on the hypertemporal analysis conducted by USGS for the extended project boundary, the land loss rate in the project area is -0.86% per year for the period 1984 to 2019. Shoreline erosion rates (1998-2017) range from 10 ft/yr along the eastern lake shoreline to 22ft/yr along the southern lake shoreline.

Restoration Strategy

The primary goal of this project are; 1) restore marsh habitat in the open water areas east and south of Catfish Lake, and 2) restore and protect the eastern and southern Catfish Lake shoreline. The specific goals of this project are; 1) create 235 acres of marsh, 2) nourish 71 acres of marsh, 3) protect the marsh creation cells from shoreline erosion.

Service goals include restoration/protection of habitat for threatened and endangered species and other at-risk species. This project would restore habitat potentially utilized by the black rail, which is proposed for listing as a threatened species. The project could also benefit other species of concern including the saltmarsh topminnow and seaside sparrow.

Sediment from Catfish Lake will be hydraulically dredged and pumped via pipeline to create/nourish 306 acres of marsh. Dewatering and compaction of dredged sediments should produce elevations conducive to the establishment of emergent marsh and within the intertidal range. Containment dikes will be constructed around each marsh creation cell. Where practicable, material will be borrowed from perimeter oil/gas canals. Containment dikes will be gapped at the end of construction or by TY3. Approximately 2,566 linear feet of sheet pile wall will also be installed as a containment feature. Approximately 12,479 linear feet of shoreline protection (gabion mattresses) will be installed along the lakeside boundary of the marsh creation cells on the constructed containment dikes.

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The project was approved for Phase I Engineering and Design in January 2020.

The project is on Priority Project List (PPL) 29.

The Federal Sponsor is US Fish & Wildlife Service.

The Local Sponsor is CPRA.

Bay Raccourci Marsh Creation and Ridge Restoration (TE-156)

Post project degraded marsh and open water.

Location

The project is located in Region 3, Terrebonne Basin, Terrebonne Parish.

Problems

High saline waters from Lake Mechant have directly contributed to the loss and/or conversion of much of the historically intermediate marshes to low salinity brackish marshes north of Lake Mechant. Subsidence, canal dredging and storm damage have also contributed significantly to the loss of marsh in the area. The zone of intermediate marsh (transition zone between fresh and brackish marshes) is located just north of Lake Merchant. High salinity water entering Bay Raccourci via Bayou Raccourci/Lake Mechant flows unimpeded into low salinity marshes surrounding Bayou Raccourci, effectively short circuiting the TE-44 Project. The 1984 to 2016 USGS loss rate is -0.32%/yr for the extended boundary area.

Restoration Strategy

The primary goals of this project are; 1) restore marsh habitat in the open water and degraded marsh areas via marsh creation and 2) restore forested ridge habitat along Bayou Decade.

The project would consist of the creation of 341 acres if marsh and 103 acres of marsh nourishment with sediments dredged from Lake Mechant and confined with earthen dikes. The proposed design is to place the dredged material to a fill height of +1.17 ft NAVD88. Dewatering and compaction of dredged sediment should produce elevations conducive to the establishment of emergent marsh and within the intertidal range. Containment dikes will be gapped at the end of construction.

The northern containment dike would be built to a height of +4.0 feet NAVD88 with a 10 feet wide crown and would also serve as a ridge. Material for the ridge would be bucket dredged from both Bayou de Cade and from within the marsh creation cell. The entire 16,350 linear feet (17 acres) of ridge would be planted with saplings and bare root seedlings on the crown and smooth cordgrass along the bayou side slopes.

The project would result in approximately 342 net acres over the 20-year project life.

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The project was approved for Phase I Engineering and Design in January 2020.

The project is on Priority Project List (PPL) 29.

The Federal Sponsor is US Fish & Wildlife Service.

The Local Sponsor is CPRA.

Phoenix Marsh Creation – East Increment (BS-42)

Degraded marsh in coastal Louisiana.

Location

The project is located in Region 2, Breton Basin, Plaquemines Parish.

Problems

Two major causes of wetland loss for this area are sediment deprivation and saltwater intrusion. Altered hydrology and oil/gas development have exacerbated this loss. Much of the fresh and intermediate marsh that once existed earlier in this century has either converted to more saline habitats or has become open water as a result of oil/gas canals, subsidence, and a lack of sediment deposition. The 1984 to 2019 USGS land change rate is -0.78% per year.

Restoration Strategy

The project goal is to restore 392 acres of marsh in the open water areas between Bayou la Croix and River aux Chênes through the placement of dredged material via hydraulic dredging. This project will work syngeristically with projects to the east by creating continuity with the Breton Landbridge Marsh Creation (West) Project (BS-38) and the Mid Breton Landbridge Marsh Creation and Terracing Project (BS-32). This proposed first increment would extend the reach of the Breton Landbridge and is part of an overall, long-range, restoration goal to create/nourish 1,000 to 2,000 acres of intermediate marsh across 5 miles of the Breton Sound Basin from River aux Chênes to the Mississippi River.

Sediment will be hydraulically dredged from the Mississippi River. The dredged riverine sediments will be pumped via pipeline into two semi-confined disposal areas. Where feasible, existing marsh will be used as containment instead of containment dikes.

Vegetative plantings are not proposed in the marsh creation areas, and containment dikes will be gapped no later than year three post construction.

Service goals include restoration/protection of habitat for threatened and endangered species and other at-risk species. This project would restore habitat potentially utilized by the black rail, which is proposed for listing as a threatened species. The project could also benefit other species of concern including the saltmarsh topminnow and seaside sparrow.

BS42_20200213

The project was approved for Phase I Engineering and Design in January 2020.

The project is on Priority Project List (PPL) 29.

The Federal Sponsor is US Fish & Wildlife Service.

The Local Sponsor is CPRA.

North Delacroix Marsh Creation and Terracing (BS-41)

NOAA staff gather data to inform project design. 

Location

The project is located in Region 2, Breton Basin, St. Bernard Parish.

Problems

Hurricanes Katrina and Rita caused the majority of wetland loss in the project site. Wind erosion and saltwater intrusion have resulted in loss of marsh vegetation and wetland soils. Marsh loss has increased exposure of Delacroix to flooding from the east/ southeast. The 1984 to 2019 USGS loss rate is -1.4%/ year for the extended project boundary area.

Restoration Strategy

The project goal is to create and nourish approximately 389 acres of marsh and construct approximately 8,548 linear feet of terraces utilizing a layout to help protect the community of Delacroix.

Sediment would be hydraulically dredged from Lake Lery and placed into two confined disposal areas creating 322 acres of marsh and nourishing 67 acres of existing marsh. Two creation cells allow a channel for drainage. Approximately 8,548 ft of earthen terraces would be constructed. The terraces would be strategically placed east of the northern marsh creation cell and south of the southern cell. Dewatering of the marsh creation cells into areas adjacent to the terraces would take advantage of sediment laden water trapping the particulates to create additional marsh. Terraces would be planted with appropriate bare root plants 2.5 ft apart in one row per side and crown. Created marsh will not be planted.

Containment dikes will be gapped no later than three years after construction. Two additional areas of deteriorating marsh south and east of the proposed project will be investigated. Data acquisition for engineering and design would include an additional
349 acres to allow robustness for these additive or alternate features during Phase I.

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The project was approved for Phase I Engineering and Design in January 2020.

This project is listed on Priority Project List 29.

The Federal Sponsor is NOAA NMFS.

The Local Sponsor is CPRA.

Caminada Headlands Back Barrier Marsh Creation – Increment 2 (BA-193)

Dredged material from the Gulf of Mexico will be pumped into open-water areas which will create 250 acres of back barrier marsh and nourish 293 acres of emergent marsh behind 4 miles of the Caminada Beach.

Location

The Caminada Headland is defined as the area south of Louisiana Highway 1 between Belle Pass and Caminada Pass. The Project is located directly behind Caminada headland beach east of Bayou Moreau and west of Elmer’s Island. The Project is located in CWPPRA Planning Region 2, Barataria Basin, in Lafourche and Jefferson Parishes.

Problems

The Project is located in an especially dynamic area of the Louisiana Coast, experiencing some of the highest shoreline retreat rates in Louisiana averaging 41.4 feet/year over the last century.  Between 2006 and 2011 shoreline migration increased dramatically, exceeding 80 ft/yr near Bay Champagne and 110 ft/yr near Bayou Moreau. The increased losses occurred after Hurricanes Katrina and Rita in 2005 as the breaches remained open for an extended length of time which were then exacerbated by Tropical Storm Fay and Hurricanes Gustav and Ike in 2008. The prolonged breaches greatly increased the net export of sediment from the headland.

Restoration Strategy

The goals of this project are to: 1) Create and/or nourish 543 acres of emergent back barrier marsh, by pumping sediment from an offshore borrow site; 2) Create a platform upon which the beach and dune can migrate, reducing the likelihood of breaching, increasing the retention of overwashed sediment, improving the longevity of the barrier shoreline, and protecting wetlands and infrastructure to the north and west. The marsh creation and nourishment cells are designed to minimize impacts on existing marsh and mangroves.  Assuming some natural recruitment, vegetative plantings are planned for 50% of the project area, with half planted at TY3 and half at TY5 (if needed). Containment dikes will be degraded or gapped by TY3 for estuarine organism access. The project would result in approximately 160 net acres over the 20-year project life and would work synergistically with Caminada Headland Beach and Dune Restoration Projects (BA-45 and BA-143), as well as Caminada Headland Back Barrier Marsh Creation Project (BA-171).

BA193_20181109Progress to Date

The 30% design review and 95% design review meetings were held on July 10, 2018 and October 25, 2018, respectively. The Phase II Request for construction funding was presented to the CWPPRA Tech Committee on December 6, 2018.

This project is on Priority Project List 25.

The Federal Sponsor is EPA

The Local Sponsor is CPRA

Delta Wide Crevasses (MR-09)

The Mississippi River Delta is one of the hallmark symbols of Louisiana’s rich natural heritage. Unfortunately, natural and man-made alterations to the Mississippi River have changed the hydrology of the river and impeded the natural wetland building processes in the delta. Levees constructed for navigation maintenance and flood control have reduced natural sedimentation and freshwater flow, causing deterioration of wetlands and saltwater intrusion. Crevasses are breaks in the levees that allow the river to deposit sediments into adjacent shallow bays. The wetlands formed from the deposition of these sediments are called crevasse splays. This restoration project mimics the natural process of crevasse formation that was responsible for building much of the Mississippi River Delta.

The project consists of maintaining presently existing crevasse splays, the construction of new crevasse splays and plugs, and future maintenance of selected crevasse splays in both the Pass a Loutre Wildlife Management Area and the Delta National Wildlife Refuge. The objective is to promote the formation of emergent freshwater and intermediate marsh.

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The project is located in Plaquemines Parish, Louisiana, within the Pass a Loutre Wildlife Management Area (Louisiana Department of Wildlife and Fisheries) and the Delta National Wildlife Refuge (U.S. Fish and Wildlife Service).

The first dredging cycle of construction was completed in 1999; three dredging cycles are scheduled in the future. The second cycle is scheduled for early summer 2004.

This project is listed on Priority Project List 6.

The Federal Sponsor is NOAA NMFS

The Local Sponsor is CPRA

Delta Management at Fort St. Philip (BS-11)

Since the crevasse, the area has been in a state of transition. It was once an organic, low-energy system consisting of brackish-saline marsh and was in decline. After the crevasse, it became a deltaic environment dominated by the formation of fresh and intermediate marshes.

GIS analysis indicates that marsh loss has decreased considerably in the project area, and marsh building has begun to occur. Many areas that historically experienced marsh loss were becoming shallower with the introduction of river sediments.

Emergent marsh has been forming throughout the area on the newly accreted mineral soils. Even though this area has experienced a net gain in emergent marsh, this project will enhance the natural marsh-building processes and increase the growth rate of emergent wetlands.

The project included the construction of terraces in open water habitat and the construction of six crevasses to increase marsh-building processes.

The terraces were planted with seashore paspalum (Paspalum vaginatum) and smooth cordgrass (Spartina alterniflora).

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The project is located on the east side of the Mississippi River near the crevasse (a break in the levee) that formed during the 1973 flood at Fort St. Philip in Plaquemines Parish, Louisiana.

The construction contractor mobilized to the project site in June 2006. A barge-mounted bucket dredge was used to construct the crevasses while marsh-buggy backhoes constructed the terraces. The six crevasses were completed in August 2006 with completion of the terraces in November 2006. A final inspection was conducted on December 4, 2006.

This project is on Priority Project List 10.

The Federal Sponsor is USFWS

The Local Sponsor is CPRA

Mississippi River Sediment Delivery System – Bayou Dupont (BA-39)

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Marshes in the project area have degraded to open water with only scattered clumps of low-lying vegetation remaining. Marsh degradation has resulted from a combination of lack of natural fresh water and sediment input, subsidence and the dredging of oil and gas canals.

The proposed project included dredging sediment from the Mississippi River for marsh creation and pumping it via pipeline into an area of open water and broken marsh west of the Plaquemines Parish flood protection levee. The material was spread over the project area and ontained primarily with existing land features. Newly-constructed low containment dikes were necessary only along a limited portion of the project area. Native intertidal marsh vegetation was planted post construction.

The proximity of the project to the Mississippi River presented a prime opportunity to employ a pipeline delivery system that utilized the sediment resources from the river to restore and create wetlands. Unlike most marsh creation projects that involve borrowing fill material from adjacent shallow water areas within the landscape, this project utilized renewable river sediment, thus minimizing disruption of the adjacent water and marsh platform.

The Bayou Dupont project represents the first example of pipeline transport of sediment from the river to build marsh as a CWPPRA project. Results from this project helped demonstrate the value and efficacy of greater use of pipeline-conveyed river sediments for coastal restoration.

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The project is located adjacent to Bayou Dupont and southeast of Cheniere Traverse Bayou in the vicinity of Ironton in Plaquemines Parish and Lafitte in Jefferson Parish, Louisiana. The general area lies west of LA Hwy 23 and just north of the Myrtle Grove Marina within the Barataria Basin.

Phase 1 was approved in January 2003. The Louisiana Department of Natural Resources (LDNR) Coastal Engineering Division performed the engineering and design services. Design was completed in November 2007; Phase 2 was approved in February 2008, and construction activities began in April of 2009. Approximately 25,935 linear feet of containment dike was used to create approximately 484 acres of sustainable marsh in Marsh Creation Areas 1 and 2. Increment 2 (funded through ARRA) added approximately 84 acres of marsh within 6,241 linear feet of containment dikes. The contractor demobilized completely by May 10, 2010. Final inspection was held on May 25, 2010.

This project is on Priority Project List 12.

The Federal Sponsor is EPA

The Local Sponsor is CPRA