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Mamaroneck and Sheldrake Rivers

Mamaroneck & Sheldrake Rivers Basin

The U.S. Army Corps of Engineers, New York District is currently conducting a General Re-evaluation Study on the Mamaroneck-Sheldrake Rivers Basin in the Village of Mamaroneck, New York.  This study is to re-evaluate the plan authorized by Congress in the Water Resources Development Act of 1986 and the design as detailed in the General Design Memorandum of 1989. This re-evaluation study is required because considerable engineering, hydrological, hydraulic, economic and environmental data has changed in the basin in the last 20-30 years. The Study will be completed in 2016 with a General Re-evaluation Report (GRR) that will be submitted to Congress.

The Study is being cost shared between the U.S. Army Corps of Engineers (75%) and the contributing non-Federal sponsors (25%): New York State Department of Environmental Conservation (NYSDEC) and Westchester County Department of Planning.

For more information, please read the Fact Sheet or you contact the Project Manager if you have any questions regarding the Study.

December 14, 2017- The U.S. Army Corps of New York District is pleased to announce the release of the Chief's Report for the Mamaroneck and Sheldrake Rivers Basin Study. Click this link to access the Chief's Report

April 14, 2017- The Final Environmental Impact Statement (FEIS) is being filed with the Environmental Protection Agency and is being made available, with the main feasibility report and the associated draft Chief of Engineers report, to interested parties, those who provided comments on the draft EIS, and other Federal and State agencies for review and comment pursuant to regulations of the President's Council on Environmental Quality for implementing NEPA (40 CFR Parts 1500-1508).  These documents are currently under review by the heads of Federal agencies and the Governor of the State of New York.  Upon receipt of comments, the report of the Chief of Engineers will be finalized and submitted to the Secretary of the Army for transmittal to Congress.   Pursuant to the Council on Environmental Quality (CEQ) NEPA Regulations 40 CFR 1506.10 (b) (2), the publication of the  Notice of Availability in the Federal Register for the Mamaroneck and Sheldrake River Basins FEIS will initiate a 30-day waiting period for the Federal decision to finalize a Record of Decision (ROD).


 Public Information Meeting

Representatives from the New York District and NYSDEC will be available to discuss the proposed project at a public information meeting on:

Date: February 25, 2016

Location: Emelin Theatre 153 Library Ln Mamaroneck, NY, 10543

Time: 6-10 PM

January 22, 2016- The U.S. Army Corps of Engineers, New York District, in partnership with the New York State Department of Environmental Conservation (NYSDEC), announces the release of the Draft Feasibility Report for the Mamaroneck and Sheldrake Rivers Basin in the Village of Mamaroneck, Westchester County, NY, Coastal Storm Risk Management Feasibility Study and Environmental Assessment. The public comment period will end on March 14, 2016.

To request a copy of the Draft Environmental Assessment and submit written comments, contact:

The U.S. Army Corps of Engineers, New York District

Planning Division-Environmental Branch (ATTN: Mr. Matthew Voisine)

26 Federal Plaza, New York, New York 10278-0090

Public comments can also be submitted by e-mail to

For further project information contact Matthew Cosby at

Comments provided will become part of the public record for this EIS. Comments submitted will be fully considered during the preparation of the final EIS.  All written comments, including names and address, will be made a part of the administrative record, available to the public under the Freedom of Information Act (FOIA). The Administrative Record, or portions thereof, may also be posted on a Corps of Engineers web site.The acknowledgement of the receipt of comments or responses to individual letters and comments will not be provided but will be included and addressed in the final EIS.


 Previous Reports


May 2014 Public Meeting Files

June 2010 Public Meeting Files