Indian River Lagoon - South C-23/24 Reservoirs and Stormwater Treatment Area (STA) Project Status

The Indian River Lagoon, home to more than 3,000 species of plants and animals, is considered the most biologically diverse estuarine system in the continental United States. The C-23 and C-24 Reservoirs and Stormwater Treatment Area are the second set of components of the multi-billion dollar Indian River Lagoon-South (IRL-S) project, part of the Comprehensive Everglades Restoration Plan (CERP).

C-23/C-24 STA

Indian River Lagoon-South C-23/C-24 Stormwater Treatment Area Construction

Construction contract awarded in September 2021
Construction scheduled to be complete in Fall 2025

C-23/C-24 North Reservoir

Initial Construction contract scheduled for award in 2024 and funded by the Bipartisan Infrastructure Law (BIL)
Follow-on construction contracts scheduled for award in 2025

C-23/C-24 South Reservoir

Design ongoing by the non-Federal sponsor, the South Florida Water Management District
Initial Construction contract award scheduled for 2024 by the South Florida Water Management District.

Indian River Lagoon - South C-23/C-24 Reservoir and STA Public Comment (Archive)

The U.S. Army Corps of Engineers, Jacksonville District, announces public comment on the Draft Supplemental Environmental Assessment (EA) and Proposed Finding of No Significant Impact (FONSI) for proposed design refinements to the Indian River Lagoon - South (IRL-S) Project, specifically to the C-23 and C-24 features in St. Lucie County. The IRL-S Project is one project that is part of the Comprehensive Everglades Restoration Plan (CERP). Public comments are due Wednesday, April 21, 2021.

Indian River Lagoon South Project
C-23/24 Stormwater Treatment Area, North and South Reservoirs Design Refinement

PROJECT DOCUMENTS

Final Integrated PIR and EIS (For reference: Indian River Lagoon - South Final Integrated PIR and EIS - March 2004)

Please submit public comments on the documents below to IRL-SComments@usace.army.mil by Wednesday, April 21, 2021 (recommended subject line “IRL-S C-23/C-24 EA Comments”).

Programmatic Agreement (18 Feb 2021)

Supplemental EA and Proposed FONSI (22 Mar 2021)

Appendix A: Pertinent Correspondence

Appendix B: Coastal Zone Consistency Determination

Appendix C: Clean Water Act Section 404(B)(1) Evaluation

Appendix D: Public Interest Review

Appendix E: DMSTA Modeling for IRL South C-23/C-24 Reservoirs and STA Model Documentation Report

Appendix F: Indian River Lagoon South (IRL-S): Water Quality Projections for Total Nitrogen Treatment in the C-23/C-24 Stormwater Treatment Area (STA)

Appendix G: Water Resource Policies and Authorities Hazardous, Toxic, and Radioactive Waste (HTRW) Guidance for Civil Works Projects

Appendix H: Indian River Lagoon South ‐ Model Documentation Report

Indian River Lagoon - South Project Documents

Indian River Lagoon - South
Final Integrated Project Implementation Report (PIR) and Environmental Impact Statement (EIS)

Final Integrated PIR and EIS (March 2004)
Note: this file is large and will take a few minutes to open

PROGRAMMATIC AGREEMENT
AMONG THE U.S. ARMY CORPS OF ENGINEERS, THE FLORIDA STATE HISTORIC PRESERVATION OFFICE (SHPO), AND THE ADVISORY COUNCIL ON HISTORIC PRESERVATION (ACHP) REGARDING THE INDIAN RIVER LAGOON SOUTH PROJECT, MARTIN AND ST. LUCIE COUNTIES, FLORIDA

News Releases

Project Manager
U.S. Army Corps of Engineers
904-232-1784

Project Manager
South Florida Water Management District
561-682-6241

Fact Sheets

Contract Links

Indian River Lagoon South C-23/24 Stormwater Treatment Area Contract Documents