US Army Corps of Engineers
Jacksonville District Website Website

CERP Indian River Lagoon-South (C)

March 2019


Indian River Lagoon-South (C)

Construction (C)
Congressional Districts: 18, 20, 21, 22


Congress authorized the Indian River Lagoon-South (IRL-S) project in the Water Resource Development Act of 2007. The Indian River Lagoon is identified as one of the most biologically diverse estuarine systems in all of the continental United States. The project will reduce the damaging effects of watershed runoff; reduce high-peak discharges; reduce nutrient loads; provide water-quality benefits to control salinity, pesticides, and other pollutants presently discharged to the estuary; and provide water supply for agriculture to offset reliance on the Floridian Aquifer. The project includes about 170,000 acre-feet (ac-ft) of new water storage in reservoirs (C-44 Reservoir, C-23/24 North/South Reservoirs and C-25 Reservoir) and storm water treatment areas (STA) (STAs C-44 West/East, C-23, C-24, and C-25); additional water storage on about 92,000 acres of natural storage areas (Allapattah, Palmar, and Cypress Creek); removal of 7,900,000 cubic yards of muck from the St. Lucie River and Estuary; and construction of artificial oyster habitat in the lagoon.


Estimated Total Cost $3,560,000,000
Estimated Federal Cost $2,126,000,000
Allocation thru FY18 $282,917,000
Allocation for FY19 $83,945,000
President’s Budget FY20 $7,500,000



South Florida Water Management District (SFWMD)
3301 Gun Club Road
West Palm Beach, Florida 33406


The Corps completed construction of the first of four contracts for the construction of the C-44 Reservoir and STA component of the Indian River Lagoon South project in July 2014. The Corps awarded a $198 million dollar construction contract for the 50,600 acre-ft C-44 Reservoir, located in Martin County, FL, in September 2015. Construction is scheduled to be complete in March 2021. The SFWMD, non-Federal sponsor, awarded a $101 million dollar construction contract for the C-44 Stormwater Treatment Area (STA) in October 2014. Construction of the STA is scheduled for completion in December 2019.  The SFWMD awarded a $40 million dollar construction contract for the 1,100 cfs C-44 Pump Stationin April 2015. The Pump Staion was completed in November 2018. Completion of the entire C-44 Reservoir and STA component is scheduled for FY21 and it will be followed for a 1-yr testing period before transfer to SFWMD for operation and maintenance.

Design of the C-24 North Reservoir, located in St Lucie, FL, continued thru FY19 and is scheduled for completion in FY21. Collection of topographic and hydrographic data were completed for the C-24 North Reservoir in FY18. Pre-design geotechnical surveys were completed in FY19 for the C-24 North Reservoir. Pre-design surveys were initiated in FY19 for the C-23 South Reservoir, for lands already acquired by the SFWMD.  Cultural resource surveys were also conducted in FY19 for new lands available for C-23 South Reservoir.  Cultural resource surveys were completed in 2010 for lands that had been acquired for the C-23 South reservoir. Design work for the C-23 South Reservoir is scheduled to begin in FY22. The combined water storage from both C-24 North and C-23 South reservoirs is planned for 91,900 acre-ft. Lands for the C23/24 STA were acquired by SFWMD, cultural resource surveys were completed, and design is scheduled to start in FY26.

Land acquisition for all remaining components (C-25 Reservoir and STA, located in St Lucie County, FL; four large natural storage and water quality areas, located in Martin St. Lucie, and Okeechobee counties; St Lucie River North-fork floodplain, located in St Lucie County, FL, and muck disposal site, located in St Lucie County, FL) are all pending completion of the reservoirs and STA components.  

Construction completion of the entire IRL-South project is scheduled for FY2045.


 Map of Indian River Lagoon-South project area.