Rockaway River at Boonton above reservoir

1. 10.00 ftMain Street businesses in Denville experience several feet of water.
2. 9.00 ftBusinesses on Main Street in Denville begin to flood. Sections of Boonton (municipality) begin to flood.
3. 8.00 ftInterstate Route 80 in Denville floods. Portions of Dover Township are under several feet of water.
4. 7.00 ftPark's Lake area in Denville is flooded. Residents near Savage Road in Denville take on water. Residential areas in Dover Township adjacent to the river experience significant flooding.
5. 6.00 ftMain Street in Rockaway is flooded. Jackson Avenue in Rockaway is flooded. Water backs up and comes through the sewer system. Main Street in Denville begins to flood. Gardner Park in Denville experiences significant flooding. Football and baseball fields are submerged in several feet of water. Portions of Boonton Township begin to flood.
6. 5.50 ftThe main parking lot at St. Clare's Hospital begins to flood.
7. 5.00 ftSavage Road and other roads around Gardner Park in Denville flood.
8. 3.50 ftThe Rockaway River leaves its banks and floods adjacent parks and trails in Denville including Gardner park.
9. 2.00 ftThe Rockaway River leaves its banks and begins to flood the river parking lot at St. Clare's Hospital.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.

Most recent crests

• January 10, 2024: 4.67 ft
• December 18, 2023: 4.71 ft
• May 1, 2014: 3.70 ft

• DownstreamRockaway River at Boonton
• Rockaway River at Boonton below reservoir
• Whippany River at Pine Brook
• Passaic River at Pine Brook
• Beaver Dam Brook at Lincoln Park
• at Ryerson at Ryerson
• Whippany River at Morristown
• Green Pond Brook at Picatinny

Forecasts by the Middle Atlantic River Forecast Center. Forecasts are issued routinely year-round.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.