NON-FEDERAL COST: Prior to the Flood Control Act of 1946, local interests provided lands, easements, and rights-of-way and provided for relocation of interfering facilities. After 1946, local cooperation was limited to minor maintenance of levees except for providing right-of-way for specific features, i.e., recreation facilities at the W. G. Huxtable Pumping Plant, Inter River Culvert and St. Francis Lake Control Structure. A tabulation of these and other non-federal costs is as follows:

Modify or relocate buildings, utilities, roads, bridges (except railroad bridges), and other facilities, where necessary in the construction of the project.

Pay one-half of the separable costs allocated to recreation (except recreational navigation) and bear all costs of operation, maintenance, and replacement of recreation facilities.

Pay a portion equivalent to 6.4% of the first costs associated with the improvements in the Big Lake area for fish and wildlife enhancement. Total Non-Federal Costs

STATUS OF LOCAL COOPERATION: maintenance as required by law. the present project schedule.

Price Escalation on Construction Features Design Changes

Post-Contract Award and Other Estimating Adjustments (including contingency adjustments) Price Escalation on Real Estate

STATUS OF ENVIRONMENTAL IMPACT STATEMENT: Environmental Quality on 11 December 1973.

on

LOCATION:

The project is located in the lower Mississippi River delta region in Plaquemines and St. Charles Parishes,
Louisiana. The Caernarvon structure is located in Plaquemines Parish on the east bank of the Mississippi River in the
vicinity of Caernarvon, Louisiana. The Davis Pond structure is located in St. Charles Parish on the west bank just
downstream of Luling, Louisiana. The two remaining structures, located in Plaquemines Parish, are Homeplace, on the west
bank, and Bohemia, on the east bank.

DESCRIPTION: The plan of improvement consists of four salinity control structures (Caernarvon, Davis Pond, Homeplace, and
Bohemia) with appurtenant levees and channels, to divert freshwater from the Mississippi River into coastal bays and marshes
for fish and wildlife restoration. The Caernarvon and Davis Pond salinity control structures are programmed, including post
construction environmental monitoring which will continue for four years after completion of construction of each structure.
The Homeplace and Bohemia salinity control structures are unprogrammed pending a decision to initiate construction.
AUTHORIZATION: Flood Control Act of 1965, and Water Resources Development Acts of 1974 and of 1986.

REMAINING BENEFIT - REMAINING COST RATIO:
Pond, and 8 3/4 percent for Homeplace.
TOTAL BENEFIT COST RATIO:
percent for Homeplace.

INITIAL BENEFIT - COST RATIO: for Davis Pond (FY 1983), and

3.3 to 1 at 3-1/4 percent for Bohemia and Caernarvon, 8-7/8 percent for Davis

3.0 to 1 at 3-1/4 percent for Bohemia and Caernarvon, 8-7/8 percent for Davis Pond, and 8 3/4

Total Estimated Programmed Construction Cost Total Estimated Unprogrammed Construction Cost Total Estimated Project Cost

2 Reflects reduction of $249,000 assigned as savings and slippage, and proposed reprogramming of $600,000 from the project.

JUSTIFICATION: The project will divert freshwater from the Mississippi River to coastal bays and marshes for fish and wildlife restoration. Benefits will include restoration of former ecological conditions by controlling salinity and supplementing nutrients. The bays are important to oyster production and as breeding areas for shrimp and food fishes, while the marsh areas produce natural food for fur-bearing animals and migratory waterfowl. A total of 981,500 acres of marshes and bays will be benefitted. The diversions will take place under regulated conditions developed from monitoring the impact on the environment and the fish and wildlife. Average annual benefits are as follows: