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August 24, 2015

Contact: Caryn Shinske (609) 984-1795
Lawrence Hajna (609) 984-1795
Bob Considine (609) 292-2994
Heidi Hoppe (USGS) (609) 771-3980


(15/P70) TRENTON – The fourth in a series of online, interactive flood-preparation maps designed to aid emergency management personnel and to inform residents in the Passaic River Basin about flooding events in real time has been launched, Department of Environmental Protection Commissioner Bob Martin announced today.

The Ho-Ho-Kus Brook Flood Inundation Map, covering a 6-mile span of the river in Bergen County’s Waldwick Borough, Ho-Ho-Kus Borough and Ridgewood, is the fourth map designated for the Passaic River Basin in response to recommendations made by Governor Christie’s Passaic River Basin Advisory Commission.

The map was developed in a partnership between the DEP and U.S. Geological Survey. Fifteen additional maps covering critical areas of the basin will be produced in coming months as part of a cooperative effort between the DEP, USGS and the U.S. Army Corps of Engineers.

Flood inundation mapping is among the recommendations in the commission’s 15-point plan for short-term and long-term measures to help mitigate flooding impacts in the basin. Governor Christie formed the commission in 2011 in response to a series of damaging floods in the basin, which covers significant portions of Bergen, Morris and Passaic counties. Key recommendations of the plan called for better information to help prepare for and respond to flooding emergencies.

“The Christie Administration remains committed to addressing flooding issues in the Passaic River Basin through mitigation, property acquisitions, de-snagging efforts and emergency preparedness and response,” Commissioner Martin said. “These easy-to-use online maps offer real-time information to residents about conditions during significant rainfalls and will assist local, state and federal officials in making critical decision to protect the public in the event of flooding.”

“This flood preparedness tool highlights how our agencies and local officials are working together to create more resilient communities, and to provide better flood preparedness and responses to flooding,” added USGS Associate Director for Water Bill Werkheiser.

In addition to this latest map, flood inundation maps are being developed for Lodi, Ridgewood and Upper Saddle River along the Saddle River; for Little Falls, Pine Brook, Chatham, Millington and Clifton along the Passaic River. Maps are also being created for Pompton Lakes, Mahwah and Oakland along the Ramapo River; for two locations in Wanaque along the Wanaque River; for Pompton Plains along the Pompton River; for Riverdale and the Macopin Intake Dam along the Pequannock River; and for Little Falls along the Peckman River.

Previous flood inundation maps were produced for a 2.75-mile reach of the Saddle River in Lodi; a 4.1-mile stretch of the river in Saddle River Borough; and for a 5.4-mile span of the river running downstream from Ho-Ho-Kus Borough through the Village of Ridgewood and Paramus Borough to the confluence with Hohokus Brook in the Village of Ridgewood.

To view the Hohokus Brook map, visit:

A click on the map shows the stream flows and water depths for the stretch of the stream that extends from White’s Lake Dam in Waldwick Borough, downstream through Ho-Ho-Kus Borough to Grove Street in the Village of Ridgewood.

Monitoring tools include current stream gauges, which provide real-time data via satellites to the USGS and the National Weather Service. The flood inundation map shows where floodwaters are expected to travel. Emergency management officials and residents can use this information to evaluate the potential threat of floodwaters to property and infrastructure.

Through the website, users will also have the option to receive email notifications in real time of critical thresholds reached in the river via the USGS WaterAlert.

To view the Scientific Investigations Report (SIR 2015-5064) documenting the development and methods used to create the flood inundations maps, visit:

For current conditions for USGS stream gauge 013910000 Hohokus Brook at Ho-Ho-Kus, visit:

For information on the Governor’s 15-point Passaic Basin plan and the Passaic River Basin Flood Advisory Commission, visit:




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Last Updated: August 24, 2015