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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.

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

 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


Emelin Theatre

153 Library Ln

Mamaroneck, NY, 10543

Time: 6-10 PM

Study Reports

The following links are to downloadable PDFs of the Draft Report, Environmental Impact Statement and associated documents for the Mamaroneck & Sheldrake Rivers Basin, Village of Mamaroneck, Westchester County, New York Coastal Flood Risk Management General Reevaluation Report.

* Mamaroneck & Sheldrake Rivers New York Flood Risk Management General Reevaluation Report Draft Main Report(~11MB)

 Previous Reports


June 2010 Public Meeting Files

May 2014 Public Meeting Files