Denville Flood Risk Management Study

The U.S. Army Corps of Engineers in partnership with the New Jersey Department of Environmental Protection, is conducting a study to document the feasibility of implementing a flood risk management project in the Township of Denville, New Jersey. For additional information please click the link below.

Denville Flood Risk Management Study Public Notice

Denville Study Overview                           Denville Recommended Plan 

The U.S. Army Corps of Engineers, New York District (USACE) has partnered with the New Jersey Department of Environmental Protection (NJDEP), the non-Federal sponsor, and the Township of Denville to investigate the feasibility of flood risk management solutions to riverine flooding from Rockaway River and Den Brook in the Township of Denville. USACE is releasing a draft Integrated Feasibility Report and Environmental Assessment (“draft report”) for the Rockaway River and Den Brook, Denville Township, Morris County, New Jersey, Continuing Authorities Program (CAP) Section 205 Flood Risk Management Study to document environmental analysis completed for flood risk management alternatives examined in this study in accordance with the National Environmental Policy Act of 1969, as amended.

Township residents and businesses have suffered extensive losses and damage from multiple flooding events in recent decades, including Hurricane Irene in August 2011 and Tropical Storm Ida in September 2021. Previous flooding impacts consist of inundation of low-lying areas including homes, businesses, and roads in the Downtown Business District.

Left: Flooding along Route 46 in Denville Township from Hurricane Irene in 2011 (Source: Steve Hockstein/For The Star-Ledger). 
Right: Flooding from Hurricane Irene on Broadway in Downtown Denville Township (Source: Township of Denville).

Study Area:

The Township of Denville, New Jersey is located about 25 miles northwest of Newark, New Jersey, in the north central part of the state. The Township is mostly developed, with the densest development being a mix of residential and commercial land uses located south of Rockaway River. The study area is approximately 130 acres and consists of residential and commercial areas. It is bounded on the North by the Rockaway River, on the South by U.S. Route 46, on the east by Rockaway River, and on the West by St. Mary’s Place. Denville is highly vulnerable to riverine flooding from the Rockaway River and Den Brook.

  Denville Study Area


This study is being carried out under the Continuing Authorities Program (CAP), Section 205 of the Flood Control Act of 1948 (Public Law 80-858), as amended, which allows USACE to plan, design, and construct small flood risk management projects. Projects are cost-shared 65% federal and 35% non-Federal, with a maximum federal contribution of $10 million per project.

Public Review Period:

The draft report is being made available to the public for a 30-day review and comment period beginning on September 26, 2023. Comments need to be received on or before December 4, 2023, to be considered. The draft report documents are available at this website. Public comments may be submitted via e-mail to or mail to the New York District address below.

Mailing Address:

U.S. Army Corps of Engineers, 
New York District, Planning Division
Subject: Denville Study
Jacob K. Javits Federal Building
26 Federal Plaza, Room 2145
New York, NY 10278-0090