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FACT SHEET - Byram River Basin, Greenwich, CT & Portchester, NY

Flood Risk Management

U.S. Army Corps of Engineers, New York District
Published Jan. 4, 2024

DESCRIPTION: Flooding on the Byram River primarily affects the Town of Greenwich, just south of the constructed project of levees at Pemberwick.  The study area has been subjected to repeated, severe flooding from high precipitation events, with the largest events being the storms of October 1955, June 1972, September 1975, and April 2007. A large number of structures were affected by flooding; the majority of structures impacted by the floods are single-family residential structures located in the Pemberwick neighborhood of the Town of Greenwich, CT. There are also minor tidally induced flood damages at the lower end of the Byram River within the Village of Port Chester, Westchester County, New York.  Though the Byram River Study is a fluvial flood risk management study, but it did consider the coastal-fluvial relationship while formulating to reduce the risk of fluvial flooding events.

AUTHORIZATION: The study was authorized by a Resolution of the House of Representatives, Committee on Transportation and Infrastructure, Docket Number 2779, dated May 2, 2007.  The project is authorized for construction in Section 401 Water Resources Development Act (WRDA) 2020

STATUS: Byram River is one of six river basins investigated in the Reconnaissance Report for Westchester County Streams, Westchester County, NY and Fairfield County, CT (approved September 2008). Feasibility Cost Sharing Agreement (FCSA) was executed on August 29, 2012 with the Town of Greenwich, the non-Federal partner for the study.  The New York District has completed the alternatives analyses and developed the cost estimate and benefit to cost ratio for ten alternatives.  The Alternative 5a - removal and replacement of the Rt. 1 Bridges plan has the maximum net benefits and is the Recommended Plan.  A Final Integrated Feasibility Report and Environmental Impact Statement was approved by HQUSACE.  The Chief's Report was approved on May 7, 2020. The project is authorized for construction in Section 401 WRDA 2020. The project is included in the Disaster Relief Supplemental Appropriation Act (DRSAA) 2022 for $5,470,00 for Pre-construction Engineering & Design (PED) phase and $35,000,000 for construction phase. The Design Agreement to start the PED was executed in April 2023 with Town of Greenwich. The PED effort is underway.



Estimated Federal Cost (100%)                                                                                                          $5,470,000   

Estimated Non-Federal Cost                                                                     $0

Total                                                                                                         $5,470,000   


Rifat Salim
Project Manager

P: (917)790-8215

Email: rifat.salim@usace.army.mil
U.S. Army Corps of Engineers, New York District

Programs and Project Management Division
26 Federal Plaza
New York, NY 10278-0090