Mahwah River at Suffern
Highest listed crest 9.70 ftFlood stage 5.0 ft1 crests since 1999
The Mahwah River at Suffern crested above flood stage 1 time among the 1 crests the National Weather Service lists from 1999 to 1999. The highest, 9.70 ft on September 16, 1999, was moderate flooding, 4.70 feet above flood stage.
The gauge
- Highest listed crest
- 9.70 ft
- September 16, 1999
- Flood stage
- 5.0 ft
- Major flooding from 10.5 ft
- Crests at major
- 0
- 1 above flood stage
- Most recent flood crest
- September 16, 1999
- 9.70 ft, moderate flooding
Flood stages
The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.
| Action stage | 4.5 | 0 | — |
| Flood stage (minor) | 5.0 | 0 | — |
| Moderate flood stage | 7.0 | 1 | Sep 16, 1999 |
| Major flood stage | 10.5 | 0 | — |
Every listed crest
1 crests from 1999 to 1999. Filled: at or above flood stage. Hover a crest for its date and stage.
- 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
| 1 | Sep 16, 1999 | 9.70 | +4.70 | Moderate |
Other gauges in Rockland County
| Suffern | 15.38 ft, Apr 5, 1984 | 0 |
Rockland County: every hazard · River floods across the country · New York
NOAA National Water Prediction Service, gauge SUFN6, 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.