CERP Indian River Lagoon-South (C)

June 2021


Indian River Lagoon-South

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 project consists of features throughout St. Lucie County and Martin County, FL. The Indian River Lagoon is identified as one of the most biologically diverse estuarine systems in all 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 Floridan 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 stormwater treatment areas (STA) (STAs C-44, 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 an artificial oyster habitat in the Southern Indian River lagoon.


Estimated Total Cost $3,839,500,000
Estimated Federal Cost $2,398,000,000
Allocation thru FY20 $376,515,000
Allocation for FY21 $150,250,000
President’s Budget FY22 $17,675,000



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


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 September 2021. The non-federal sponsor, SFWMD, awarded a $101 million dollar construction contract for the C-44 STA in October 2014. Construction of the STA was completed in March 2021. In April 2015, the SFWMD awarded a $40 million dollar construction contract for the 1,100 cfs C-44 Pump Station; it was completed in November 2018. Completion of the entire C-44 Reservoir and STA component is scheduled for FY21. It will undergo up to two years of operational, testing, and maintenance before transfer to SFWMD for operation and maintenance.

Design of the C-23/C-24 STA, located in St. Lucie County, is ongoing; construction contract award is scheduled for September 2021. Design of the C-23/C-24 North Reservoir, located in St Lucie County, FL, is scheduled for completion in FY 23, with construction contract award scheduled for summer of 2023. Initial design work for the C-23/C-24 South Reservoir is ongoing, with a scheduled design contract award in September 2021 with construction award scheduled for FY 24. The completed C-23/C-24 project features will provide an estimated 91,900 acre-ft of additional storage.

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


Map of Indian River Lagoon South project area