South Lake Lery Shoreline & Marsh Restoration (BS-16)

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Reasons for Restoration:

According to USGS-land loss analysis, much of the southern and western shorelines of Lake Lery and the surrounding wetlands were heavily damaged in 2005 by Hurricane Katrina. In the years following this storm, wind induced waves within the lake have begun to cause further damage to the lake’s shorelines. Currently the shorelines have become so damaged that the interior emergent marshes that are still intact are being exposed to the damaging waves. This has caused an increased loss of emergent marsh habitat. Even with the benefits of the Caernarvon Diversion Structure, without some type of restoration in this area, these marshes may not be able to fully recover.

Restoration Strategy:

This is a marsh creation and shoreline restoration project. The marsh creation aspect of the project will have a hydraulic dredge extract material from the Lake Lery water bottom and pump that material into contained marsh creation cells located south and west of the southern and western Lake Lery shorelines. This will create and/or nourish approximately 642 acres of intertidal intermediate marsh. The shoreline restoration component of the project will  have a barge-mounted dragline excavating material from the bottom of Lake Lery and placing that material along the southern and western shorelines. This restored shoreline will have a 50 foot crown width and be built to a height considered high intertidal marsh.

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Progress to Date:
This project received Phase II funding in January 2012. Construction began in the spring of 2015 and is expected to be complete in the summer of 2018. All marsh creation is complete. Earthwork and vegetative plantings associated with the lake rim embankments are complete. There are ongoing discussions regarding erosion concerns along lake rim embankments.
This Project is on Project Priority List 17.

The Sponsors for this Project include:

sponsors_1.pngFederal Sponsor: U.S. Fish and Wildlife Service

Local Sponsor: CPRA

 

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Coastwide Vegetative Planting (LA-39)

 

The coastal restoration community has long recognized the benefits of vegetative plantings in restoration. Many marsh creation and most terracing projects require plantings to insure success. Coastal shoreline plantings have also proven to be very effective and some have demonstrated the ability to not only stop shoreline erosion but to facilitate accretion, the process of increasing sediments. Recent hurricane events have exposed a need to have a mechanism in place where large-scale planting efforts can be deployed in a timely manner to specifically targeted areas of need, anywhere along the coast. Although the CWPPRA program can fund specific largescale planting projects, the normal program cycle for individual projects can delay needed restoration plantings for a number of years.

The goals of this project are to facilitate a consistent and responsive planting effort in coastal Louisiana that is flexible enough to routinely plant on a large scale and be able to rapidly respond to critical areas of need following storm or other damaging events. This project set up an advisory panel consisting of representatives from various state and federal agencies who would assist in the selection of projects for funding. The project also set up a mechanism by which project nominations would be submitted for consideration. The equivalent of 90 acres of interior marsh and 40,000 linear feet of coastal shoreline will be planted per year over a 10 year period to effectively create/protect a total of 779 net acres of marsh over the 20-year project life.

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The project features are located in the coastal zone of Louisiana.

This project is on Priority Project List 20. Three sites have been planted with Year One funding, and three sites are scheduled to be planted in 2014 with Year Two funding.

 

Federal Sponsor: NRCS

Local Sponsor: CPRA

Marsh Island Hydrologic Restoration (TV-14)

banner_tv-14.fwReasons to Restore:

  • Natural erosion
  • Subsidence
  • Construction of navigation canals along the northeast shoreline of a Marsh Island.
  • Deterioration of the north rim of Lake Sand and the interior marshes.

Restoration Strategy:

  • Stabilizes the northeastern shoreline of Marsh Island.
  • Stabilizing the northern shoreline of Lake Sand.
  • Help restore the historic hydrology.
  • Construction of 7 closures for oil and gas canals at the northeast end of Marsh Island.
  • Protect the northeast shoreline with rock including the isolation of Lake Sand from Vermilion Bay.

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[2]

Location:

This project is located in Iberia Parish, Louisiana, on the eastern portion of the Russell Sage Foundation Marsh Island State Wildlife Refuge and surrounding Lake Sand.

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Project Effectiveness [1]:

  • Effective at reducing water level variability within the northern portion of the project area
  • Water level variability did not increase in the project area as is did in R1 post-construction
  • Reducing erosion rates at the northeast shoreline was partially met
  • Reduced erosion in areas of applied rock dikes versus unprotected areas.
  • The steel sheet pile, rock rip-rap wingwall, and stone bank paving installed at each end of closure No. 5 proved to be successful in preventing erosion during a storm event.

Previous Progress [2]:

  • The monitoring plan was finalized in January 2000 following with further data collection.
  • Pre-construction and post-construction aerial photography were in the year 2000, and 2009 with future imagery analyses upcoming.
  • Water level, submerged aquatic vegetation and shoreline position and movement data were also collected to evaluate project effectiveness.

Progress to Date [1]:

  • Construction was completed in December 2001.
  • This is one of the three projects nearing the end of their 20 year lives.
  • The Task Force will vote on the Technical Committee’s recommendation on the path forward for the following projects [1]:

3 projects

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

Project Sponsors Include:

                     US_AOE_Logo

 

  CPRA_logo_sponsor                

Source:

[1] Mouledous, M. and Broussard, D. 2014. 2014 Operations, Maintenance, and Monitoring Report for Marsh Island Hydrologic Restoration. Coastal Protection and Restoration Authority (CPRA). Available:https://lacoast.gov/ocmc/MailContent.aspx?ID=10092 [May 22,2018].

[2] Marsh Island Hydrologic Restoration (TV-14) Land-Water Classification. 2009. Coastal Wetlands Planning, Protection, and Restoration Act (CWPPRA). Available: https://www.lacoast.gov/products/sab_net_pub_products/map/original/2011-02-0009.pdf [May 22, 2018].

Rockefeller Refuge Gulf Shoreline Stabilization (ME-18)

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The project is designed to address Rockefeller Wildlife
Refuge gulf shoreline retreat that averages approximately
46 feet/year with a subsequent direct loss of emergent saline
marsh.

The project will construct shoreline protection along the Gulf
of Mexico. A rock breakwater with lightweight aggregate
core will be tied into the west bank of Joseph Harbor
and constructed westward along the gulf shoreline for
approximately 3 miles. The structure is designed to reduce
shoreline retreat along this stretch of gulf shoreline, as well
as promote shallowing, settling out, and natural vegetative
colonization of the overwash material landward of the
breakwater. Gaps will be constructed between breakwater
segments to facilitate material and organism linkages.

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The project is located along the Rockefeller Wildlife Refuge
Gulf of Mexico shoreline from Joseph’s Harbor canal,
westward 3 miles in Cameron Parish, Louisiana.

Engineering and design are complete. Construction on this
project has begun.

This project is listed on Priority Project List 10.

The Sponsors for this project include:

Bio-Engineered Oyster Reef Demonstration (LA-08)

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Purpose:

The purpose of this project is to test a new, bio-engineered, product to address rapid shoreline retreat and wetland loss along the Gulf of Mexico Shoreline in areas with soils of low load bearing capacity. For example, at Rockefeller Refuge, the direct Gulf of Mexico frontage and extremely low soil load bearing capacity (250-330psf), coupled with an average shoreline retreat of 30.9 ft/yr, present unique engineering challenges with a subsequent direct loss of emergent saline marsh.

Restoration Strategy:

The goal of this demonstration project is to evaluate the proposed technique as a cost effective technique for protecting areas of Coastal Louisiana’s Gulf of Mexico Shoreline with poor load bearing capacities.The demonstration project would consist of an Oysterbreak, approximately 1000′ long. The Oysterbreak is a light-weight, modular shore protection device that uses accumulating biomass (an oyster reef) to dissipate wave energy. The bio-engineered structure is designed to grow rapidly into an open structured oyster reef utilizing specifically designed structural components with spat attractant (agricultural byproducts) and enhanced nutrient conditions conducive to rapid oyster growth.

Required Monitoring: [1]

  • Topographic and bathymetric surveys (elevation, water levels)
  • Ground-level photography
  • Aerial photography
  • Wave attenuation (wave energy effects)
  • Oyster and Water quality monitoring

The Oysterbreak is constructed by placing modular units into an open interlocked configuration. The units are sized to be stable under storm wave conditions. The height and width of the Oysterbreak are designed to achieve a moderate initial wave energy reduction. As successive generations of encrusting organisms settle on the Oysterbreak, the structure’s ability to dissipate wave energy increases.

Location:

The project is located along the Rockefeller Wildlife Refuge Gulf of Mexico shoreline west of Joseph Harbor canal in Cameron Parish, Louisiana.

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Project Effectiveness: [2]

The oysterbreaks are providing habitat for oyster settlement and the top layers of rings should be the most likely to support oyster colonies. Recommended improvements include:

  • Types of cement applications
  • Lessening the space available for coastal erosion (the gap between coast and oysterbreaks needs to reduce to prevent further erosion).
  • Crest elevation between the oysterbreaks performed well in wave attenuation and shoreline erosion
  • Increase the height of the structure to improve wave breaking potential

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Progress to Date:

The cooperative agreement between the National Marine Fisheries Service and the Louisiana Department of Natural Resources has been executed. Construction was finalized in February 2012. This project is on Priority Project List (PPL) 17.

More Information on this Project:

Further Websites Regarding Oyster Reef Restoration:

 

 

Work Cited:

[1] McGinnis and Pontiff. (pages 4-6) LA-08 2012 Operations, Maintenance, and Monitoring Plan, 30 April 2018, https://www.lacoast.gov/reports/project/4224379~1.pdf

[2] McGinnis and Pontiff. (page 22) 2014 Operations, Maintenance, and Monitoring Report for Bioengineered Oyster Reef Demonstration Project (LA-08)

 

 

Black Bayou Culverts Hydrological Restoration (CS-29)

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The marsh within this area has been suffering from excessive water levels within the lakes subbasin that kills vegetation, prevents growth of desirable annual plant species, and contributes to shoreline erosion. Black Bayou offers a unique location in the basin where the water in the lakes subbasin and the outer, tidal waters are separated by only a narrow highway corridor.

Project components include installing ten 10 foot by 10 foot concrete box culverts in Black Bayou at the intersection of Louisiana Highway 384. The structure discharge will be in addition to the discharges provided by Calcasieu Locks, Schooner Bayou, and Catfish Point water control structures.

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The project features are located in southern Calcasieu Parish, Louisiana. The majority of the project area is located east of Calcasieu Lake and includes areas north of the Gulf Intracoastal Waterway and west of Grand Lake in Cameron Parish, Louisiana.

Construction has been completed.

This project is on Priority Project List 9.

Federal Sponsor: NRCS

Local Sponsor: CPRA

South Grand Chenier Marsh Creation (ME-20)

ME-20_bannerThe major problem in the Hog Bayou Unit is land loss caused by failed agricultural impoundments and pump-offs. Other problems include saltwater intrusion from the Mermentau Ship Channel and a Gulf shoreline erosion rate of 40 feet per year. Over a period of 60 years, 9,230 acres (38% of the original marsh) was lost from the Hog Bayou Watershed, with the greatest amount of land lost between 1956 and 1974.

The major contributors to land loss in the Watershed are subsidence, compaction, and the oxidization of marsh soils in the former pump-offs and leveed agricultural areas between Hog Bayou and Highway 82. Large areas of marsh south of Highway 82 were “force drained” during the 1960s, 1970s, and 1980s. Many of these same areas now consist of open water with very little wetland vegetation. One of the largest areas of current loss is in and north of the project area.

The project’s goal is to create 430 acres and nourish 23 acres of emergent brackish and intermediate marsh. The project goal will be achieved by using dredged material from the Gulf to create two marsh creation cells (176 acres and 277 acres) in the project area east and west of Second Lake.

The project is located south of Grand Chenier in Cameron Parish, Louisiana, between Louisiana Highway 82, Hog Bayou, and east of Second Lake.

ME_20This project was selected for Phase I (engineering and design) funding at the January 2002 Task Force meeting. It is included as part of Priority Project List 11. Engineering and design is complete. Construction funding will be requested in 2013.

This project is on Project Priority List (PPL) #11.

The South Grand Chenier Marsh Creation’s three sponsors include