* Problems: New Cut was first formed in 1974 when the eastern end of Trinity Island was breached during Hurricane Carmen. This breach was further widened by Hurricane Juan in 1985 and Hurricane Andrew in 1992. — The Isles Dernieres shoreline is one of the most rapidly deteriorating barrier shorelines in the U.S., exhibiting a pattern of fragmentation and disintegration. — With regard to long shore sediment transport systems or the movement of beach material by waves and currents, the islands have ultimately become sources of sediment themselves leading to an ever-decreasing volume of sediment.
* Restoration Strategy: The purpose of this project was to close the breach between Trinity and East Islands through the direct creation of beach, dune, and marsh habitat. This project also lengthened the structural integrity of eastern Isles Dernieres by restoring the littoral drift by adding sediment into the nearshore system (restoring about 8,000 linear feet of barrier island).
* Location: New Cut is the breach between East and Trinity Islands in the Isles Dernieres barrier island chain. The cut is bordered on the north by Lake Pelto, on the west by Trinity Island, on the east by East Island and on the south by the Gulf of Mexico, in Terrebonne Parish, Louisiana.
* Progress to Date: A rock dike and approximately 2 million cubic yards of dredged material reconstructed a dune and marsh platform to protect the shoreline from erosion and to restore interior marsh lost from subsidence and saltwater intrusion.
Phase 2 (construction) funding was initially approved at the January 2001 Louisiana Coastal Wetlands Conservation and Restoration Task Force meeting and additional funds allocated in 2006 to account for change in borrow site and post-hurricane increased construction costs. Dredging was completed July 2007. About 8,000 linear feet of barrier island was restored by placing approximately 850,000 cubic yards of material. New Cut was closed through the construction of a dune platform matching the dune elevations on the east and west, strengthening the connection between East and Trinity Islands. Nine species of native barrier island vegetation were planted along with over 17,000 linear feet of sand fencing. No maintenance is anticipated over the 20-year design life.
* This Project is on Priority Project List (PPL) 9.
From July 16th-18th, the CWPPRA Public Outreach Team and special guests helped educate children about wetland resources during the inaugural Project Front Yard STEM summer camp at Girard Park in Lafayette, LA. Project Front Yard is an organization within Lafayette Consolidated Government that seeks to educate the public towards a more sustainable future. Our activities this week covered wetland plants, endangered species, and birding with groups split by age: 5-8, 9-10, and 11-14 years old.
On the first day, our team demonstrated how wetland plants transport gases through their tissues with the help of Carrie Salyers of the Louisiana Department of Wildlife and Fisheries. Using plastic cups, straws, and a tray of water, campers had to get air into and out of the “leaves” (cups) and the “roots” (straws) while they were inundated. We also brought our Wetland Jeopardy board to test campers’ knowledge of Louisiana’s wetland flora, fauna, and benefits.
Tuesday morning, the children walked into their meeting room to a toothy surprise. Gabe Giffin from LDWF brought several young alligators from Rockefeller NWR for the campers to hold and examine. In another room, Carrie Salyers taught the campers about the biology of endangered whooping cranes. After discussing how Whooping Cranes use their beaks to catch food, Salyers, her CWPPRA helpers, and ULL’s Sam Hauser led an activity exploring how bird beak shapes are suited to eating different types of foods.
For our last day with the camp, Jessica Schulz, an ornithologist with the U.S. Geological Survey, brought a mist net to demonstrate how birds are captured and processed in the field. We set up outside in Girard Park and allowed the children to retrieve fake birds from the mist net, band their legs, and record some measurements to measure the health of the birds. While we were setting up, we accidentally caught a real house sparrow! The bird was released quickly and campers were able to see firsthand how effective mist nets can be!
Construction of navigation canals along the northeast shoreline of a Marsh Island.
Deterioration of the north rim of Lake Sand and the interior marshes.
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.
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.
Project Effectiveness :
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 :
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 :
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 :
This project is on Priority Project List (PPL) 6.
Project Sponsors Include:
 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].
Water flows downhill naturally and, over time, will make a river change from one path to another. As sediment moved and elevations changed over the last 7 millennia, the Mississippi River has emptied into several historic delta complexes: Maringouin, Teche, St. Bernard, Lafourche, Plaquemines-Balize, and Atchafalaya. Each of the deltas built up part of Louisiana’s coast to what we see today, but now that natural process has been interrupted . After the great Mississippi flood of 1927 that caused $1 billion worth of damages (almost $1 trillion in today’s dollars), the US Army Corps of Engineers built the world’s longest levee system under the Flood Control Act of 1928. The Levee system was constructed to reduce flood damages and allow for more control of the Mississippi .
Image 1: Historic Deltas of the Mississippi River
An unforeseen and unfavorable side effect to taming the river was that all the water is kept moving too quickly to deposit sediment, and now sediment is lost to the Gulf of Mexico rather than deposited into our coastal wetlands . Our Louisiana coastline is dependent on new sediment to nourish wetland ecosystems. Without sediment delivery, there is no material for natural land gain or replenishment, which will continue to contribute to our retreating coastline. The solution is not as simple as removing the levee system, however, since so much of Louisiana is populated now, and removing the levees containing the Mississippi would displace millions of residents from their homes. Instead, CWPPRA and our partners in restoration use man-made systems to create marsh, nourish wetlands, and maintain hydrologic connectivity so that we can protect and restore Louisiana’s coast.
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.
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.
Environmental awareness is an important factor in protecting the earth, and the Audubon Institute understands that. With the help of Entergy, the Audubon Zoo has hosted Earth Fest for over twenty years to date, celebrating conservation and environment-friendly practices.
This past Saturday, March 24, CWPPRA was one of many organizations to be represented at Earth Fest along with Wetland Watchers, EnergySmart, Sea Grant, and many more. Each of these organizations brought educational activities to be enjoyed by children and adults alike, such as demonstrations of energy-saving appliances, composting, and beekeeping strategies. Participants could paint with produce from a local farmer’s market, learn about the similarities in bone structures between humans and manatees, and get their faces painted. When they were not busy visiting the zoo enclosures or talking to organizations, guests could enjoy a number of local food vendors or live performers at the pavilion, including Grammy-winning Lost Bayou Ramblers from south Louisiana.
CWPPRA Public Outreach spent the day handing out informational booklets about restoration projects, posters from the Protect Our Coast series, and activity books, as well as playing our popular “Wetland Jeopardy” game with any and all who were interested. Many eager and interested visitors participated in the Earth Fest Earth Quest, a game that led them to ask questions to appropriate organizations in exchange for a stamp. 10 stamps earned them a prize of a young plant to take home and care for. Earth Fest had a wide range of attractions that hopefully inspired all visitors to be more conscious of environmental issues and to help in the efforts to live for a healthier tomorrow.
Significant marsh loss has occurred between Lake Pagie and
Bayou DeCade to the point that little structural framework
remains separating those two waterbodies. Northeast of Lost
Lake, interior marsh breakup has resulted in large, interior
ponds where wind/wave energy continues to result in marsh
loss. West of Lost Lake, interior breakup has occurred as
a result of ponding and the periodic entrapment of higher
salinity waters during storm events.
Approximately 465 acres of marsh will be created between
Lake Pagie and Bayou DeCade, north of Bayou DeCade,
and along the northwestern Lost Lake shoreline. Marsh
creation will restore/protect some key features of structural
framework (i.e., lake rim and bayou bank) within the area.
Borrow material will be taken from within Lost Lake and
pumped via a hydraulic dredge into the marsh creation sites.
Tidal creeks will be constructed within the marsh creation
cells to ensure tidal connectivity and prevent ponding within
the created marsh. In addition, 30,000 linear feet (22 acres)
of terraces will be constructed to reduce fetch in an area of
deteriorated marsh north of Bayou DeCade.
Two fixed-crest weirs along Carencro Bayou will be replaced
with variable-crest structures. At certain times of the year,
Carencro Bayou is an excellent source of fresh water and
sediments from the Atchafalaya River/Four League Bay
system. However, delivery of that water into the marshes
west of Lost Lake is limited by fixed-crest weirs which limit
water exchange. Installing structures with bays/gates will
increase freshwater and sediment delivery. In addition, two
fixed-crest weirs near Rice Bayou will be replaced with
variable-crest structures to provide flow-through conditions
in the system (i.e., water enters the system from Carencro
Bayou and exits through the structures near Rice Bayou).
A similar structure will be installed along Little Carencro
Bayou to increase freshwater and sediment delivery into the
marshes north of Lost Lake.
The project is located in the Terrebonne Basin, Terrebonne
Parish, near the vicinity of Lost Lake.
This project is on Project Priority List(PPL) 19.
The Lost Lake Marsh Creation and Hydrologic Restoration project sponsors include: