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FACT SHEET-Mattituck Harbor, NY

Federal Navigation Channel- Maintenance of Infrastructure and Stewardship

U.S. Army Corps of Engineers, New York District
Published Jan. 19, 2023

DESCRIPTION: This navigation asset is at tidal inlet located on the north shore of Long Island Sound, about 85 miles by water east of the Battery, New York City; and provides for a channel, 7 feet deep, 100 feet wide at the entrance and 80 feet wide thereafter, from the Long Island Sound, extending southward about 2 ¼ miles, to the Village of Mattituck, Town of Southold, Suffolk County, NY. There are two riprap jetties at the channel entrance. The east jetty was completed in 1906 with a length of approximately 775 feet, and the west jetty was completed in 1938, with a length of approximately 1,100 feet.  The original navigation channel construction was completed in 1914.  Construction of the navigation channel under the existing project was completed in 1921.

AUTHORIZATION: Rivers and Harbors Act of 1896 (29 Stat. 202), modified in 1935 (P.L. 74-409) and 1964.

COMMERCE: This asset serves as a Harbor of Refuge during severe storms. The harbor also supports recreational boating, including several commercial marinas. The Mattituck Creek Waterway Access Site, adjacent to the federal channel, is the largest boat launch site maintained by New York State Department of Environmental Conservation, and provides public access to the waters of Long Island Sound.  

BACKGROUND: In Fiscal Year (FY) 2014, the Mattituck Inlet Federal Navigation Channel was used as a sand source for a beach nourishment project when approximately 100,000 cubic yards (CY) of dredged sand was placed at Baillie Beach Park in Mattituck, NY, under Section 111 of the Continuing Authorities Program (CAP). Prior to that, channel was maintenance dredged in FY2004, when approximately 14,000 CY of dredged sand was beneficially used along the Baillie Beach Park shoreline. During FY1996, a west jetty rehabilitation project was completed.

STATUS:  In FY2023, commonly performed Operations & Maintenance (O&M) work includes initiation of sampling & testing to identify potential dredged material placement sites, in preparation for expected future maintenance dredging.  The latest (FY2023) hydrographic channel condition survey and controlling depth report have been published on the District’s website: https://www.nan.usace.army.mil/Missions/Navigation/Controlling-Depth-Reports/ 


Alexander F. Gregory
Asset / Project Manager
P: (917) 790-8427  
Email: alexander.f.gregory@usace.army.mil
U.S. Army Corps of Engineers, New York District
26 Federal Plaza
New York, NY 10278  

District Area: NY # 1