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FACT SHEET-Green Brook Sub Basin, NJ

Flood Risk Management Project

U.S. Army Corps of Engineers, New York District
Published Jan. 5, 2022
Updated: Sept. 13, 2022

DESCRIPTION: The Green Brook Sub Basin is located within the Raritan River Basin in north-central New Jersey in the counties of Middlesex, Somerset and Union. It encompasses 13 municipalities and drains approximately 68 square miles composed primarily of suburban, commercial, and industrialized areas. For the majority of the project area, the most damaging floods of record resulted from the August 2, 1973 storm, Tropical Storm Floyd on September 16, 1999, the April 15-17 2007 Nor’easter and Tropical . Eight deaths were attributed to these floods, six in the Stony Brook area in the August 1973 flood event and two in Bound Brook during Floyd in 1999. The Final General Reevaluation Report (GRR) and Supplemental Environmental Impact Statement (SEIS), dated May 1997, recommended implementation of a flood risk management project for the Lower Basin and Stony Brook Basin, and is supported by the project sponsor, the New Jersey Department of Environmental Protection. Based on this report and input obtained during the public review period, the State of New Jersey requested that the Upper Basin portion of the project be deferred, pending additional consideration of alternatives.

The Corps has reevaluated the Upper Basin features via a Validation Study examining the feasibility of the Oakway (Segment O) and Skytop (Segment S) Detention Basins and the Green Brook channel modifications (Segment M) as described in the 1997 Green Brook General Reevaluation Report.  These features were authorized as part of the original project in WRDA 1986. The Validation Study has determined that Segment M along with O and S are no longer viable and that a General Reevaluation Report (GRR) is needed in order to examine the feasibility of other alternatives in the Upper Basin in-lieu of the detention basins and channel modifications.  The revised features could include non-structural work such as floodproofing, buy-outs, elevation of structures; channel modifications either small in scale or in combination with other measure(s); a diversion tunnel; levees or floodwalls; and other features.

AUTHORIZATION: This project is authorized for construction in Section 401a of the Water Resources Development Act of 1986, with the following cost sharing requirements: Local interests will provide lands, easements, rights-of-way, and relocations, pay 25 percent of total project costs (of which at least 5 percent is cash), and bear all costs of operation, maintenance, and replacement of flood control facilities. Federal share is 75 percent of total project costs. 

STATUS: A Project Cooperation Agreement was signed 24 June 1999 with the State of New Jersey. The Bound Brook portion of the project has been completed and consists of the following project features: Segment U levee, floodwall; Segment R1 levee; Talmage Avenue Bridge raising; Segment R2 Levee, Floodwall and Pump Station; Segment R2 NJ Transit Closure Gate and Diversion Pipes; Segment U Bendway Weirs; Segment R2 South Main Street Closure Gate; E.Main Street/Lincoln Blvd. Bridge raising; Segment T levee, pump station and closure gate; Segment R-2 Tie-off, Segment T modifications; the East Main St. storm sewer line and the Conrail Bridge demolition.  The LOMR was issued by FEMA on July 18, 2016.  The ribbon cutting was held on August 15, 2016 in Billian Legion Park, Bound Brook, N.J.

The following project features are currently completed in the Borough of Middlesex: Segment B1 consisting of the Sebrings Mills Bridge Raising, Levee, Pump Station and Floodwall, the Segment B-2 Floodwall, and the Segment B-3 Levee, Floodwall, and Pump Chamber. Award of construction for Segment C-2, Contract 1 occurred in September 2018. The floodwall has been placed with contract closeout to be processed by the end of FY22. The base portion (Floodwall) of the Segment C1 Contract (Floodwall, Levee, Pump Station, NJ Transit Culvert Crossing) was awarded 30 September 2019 and has since been completed. The Segment C1 culvert was successfully moved into position through the New Jersey Transit railroad embankment in May 2021. The curved floodwall and pump chamber have been placed with finishing work ongoing. The USACE is moving ahead with design, real estate acquisition and permit acquisition for Segment C2 & H, Contract (Closure Gates, Floodwall, Levee, & Pump Stations) and Segment C3 & C4 to award construction contracts in FY23.

Estimated Project Costs: The total estimated Federal portion of the project cost is $855,070,000.  Through FY 20 the NY District has received $266,813,000 in Federal funds. The FY 22 budget amount is $1,000,000. The Disaster Relief Supplemental Appropriations Act (DRSAA), passed early 2022, budgets $496 million in Federal funding to continue construction on the Lower Basin and Stony Brook areas. The team is preparing a schedule for completion of the remaining portions of the Lower Basin, and Stony Brook, given the budgeted funding and expectation to award larger construction contracts and expedite project completion. DRSAA also budgets $3.2 million to initiate and complete a General Reevaluation Report (GRR) examining if a plan for flood risk management can be implemented in the Upper Basin.


Mr. Alek Petersen

Project Manager

P: (917) 790-8624

Email: Aleksander.J.Petersen@usace.army.mil

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

Programs and Project Management Division

26 Federal Plaza

New York, NY 10278