Ramapo River at Suffern

Highest listed crest 15.38 ftFlood stage 15.2 ft3 crests since 1984

The Ramapo River at Suffern crested above flood stage 2 times among the 3 crests the National Weather Service lists from 1984 to 2011. The highest, 15.38 ft on April 5, 1984, was minor flooding, 0.18 feet above flood stage. 1 other gauge on the Ramapo River crested above flood stage within a week of it.

The gauge

Highest listed crest: 15.38 ft; April 5, 1984; 12,300 cubic feet per second
Flood stage: 15.2 ft; Major flooding from 17.5 ft
Crests at major: 0; 2 above flood stage
Most recent flood crest: September 16, 1999; 15.23 ft, minor flooding
Location: Rockland County; Near Suffern (0.8 mi), Airmont (3.2 mi), Ramsey (3.6 mi)
Identifiers: NWS SFFN6; USGS 01387420

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Ramapo River at Suffern

Action stage	14.8	0	—	The level at which the NWS or its partners begin to take action
Flood stage (minor)	15.2	2	Sep 16, 1999	Minimal or no property damage, but possibly some public threat
Moderate flood stage	16.5	0	—	Some inundation of structures and roads near the stream
Major flood stage	17.5	0	—	Extensive inundation of structures and roads

Every listed crest

3 crests from 1984 to 2011. Filled: at or above flood stage. Hover a crest for its date and stage.

Crests at or above flood stage, by decade

These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Ramapo River at Suffern

1	Apr 5, 1984	15.38	+0.18	Minor	12,300
2	Sep 16, 1999	15.23	+0.03	Minor	10,500
3	Mar 11, 2011	12.00	−3.20	Below flood stage	—

The worst floods along the Ramapo River

For this gauge's highest crests, the other gauges on the Ramapo River that crested above flood stage within a week.

April 5, 1984: 15.38 ft here, minor flooding

Pompton LakesNJ · Apr 5, 1984 · 21.60 ft · Major

September 16, 1999: 15.23 ft here, minor flooding

MahwahNJ · Sep 16, 1999 · 12.52 ft · Major

Gauges on the Ramapo River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Ramapo River

Suffern this gauge	NY	15.2	15.38 ft, Apr 5, 1984	0
Mahwah	NJ	8.0	15.78 ft, Aug 28, 2011	3
Pompton Lakes	NJ	11.5	22.62 ft, Aug 29, 2011	9

Other gauges in Rockland County

Flood gauges in Rockland County

Suffern	5.0	9.70 ft, Sep 16, 1999	0

Rockland County: every hazard · River floods across the country · New York

NOAA National Water Prediction Service, gauge SFFN6, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.