Ramapo River at Mahwah
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/29/2025 9:30 PM EDTOfficial Forecast (FCST) 06/29/2025 9:36 AM EDTRecord: 15.8 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 12 ft Moderate Flooding 9 ft Minor Flooding 8 ft Action 7.5 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 12 - Major flooding along Route 202 and Route 17 intersection. Road closed. Flooding along Riverview Drive and along Halifax Road and Bridle Path Lane. Flooding on Brakeshoe Place, Brook Street and Catherine Avenue.
- 9 - State Route 202 floods downstream. Moderate flooding along Route 202 and Route 17. Water into backyards. Minor flooding along Brakeshoe Place, Brook Street and Catherine Avenue.
- 8 - Minor flooding along Route 202.
Gauge Location
Recent Crests
| 1. | 15.78 ft | on 08-28-2011 |
| 2. | 9.55 ft | on 04-17-2011 |
| 3. | 10.72 ft | on 03-11-2011 |
| 4. | 11.16 ft | on 03-07-2011 |
| 5. | 8.07 ft | on 12-12-2008 |
Recent Crests
| 1. | 15.78 ft | on 08-28-2011 | |
| 2. | 9.55 ft | on 04-17-2011 | |
| 3. | 10.72 ft | on 03-11-2011 | |
| 4. | 11.16 ft | on 03-07-2011 | |
| 5. | 8.07 ft | on 12-12-2008 | |
| 6. | 9.85 ft | on 10-13-2005 | |
| 7. | 9.87 ft | on 04-03-2005 | |
| 8. | 8.80 ft | on 12-11-2003 | |
| 9. | 12.52 ft | on 09-16-1999 | |
| 10. | 8.69 ft | on 01-25-1996 | |
| 11. | 8.88 ft | on 11-12-1995 | |
| 12. | 8.40 ft | on 01-05-1982 | |
| 13. | 9.90 ft | on 01-25-1979 | |
| 14. | 10.50 ft | on 12-21-1973 | |
| 15. | 9.77 ft | on 02-03-1973 | |
| 16. | 10.76 ft | on 08-28-1971 | |
| 17. | 11.87 ft | on 05-29-1968 | |
| 18. | 8.87 ft | on 02-26-1961 | |
| 19. | 9.33 ft | on 12-21-1957 | |
| 20. | 12.53 ft | on 10-16-1955 | |
| 21. | 11.35 ft | on 08-19-1955 | |
| 22. | 10.40 ft | on 09-22-1938 | |
| 23. | 11.00 ft | on 10-09-1903 | 1 |
Historic Crests
| 1. | 15.78 ft | on 08-28-2011 |
| 2. | 12.53 ft | on 10-16-1955 |
| 3. | 12.52 ft | on 09-16-1999 |
| 4. | 11.87 ft | on 05-29-1968 |
| 5. | 11.35 ft | on 08-19-1955 |
Historic Crests
| 1. | 15.78 ft | on 08-28-2011 | |
| 2. | 12.53 ft | on 10-16-1955 | |
| 3. | 12.52 ft | on 09-16-1999 | |
| 4. | 11.87 ft | on 05-29-1968 | |
| 5. | 11.35 ft | on 08-19-1955 | |
| 6. | 11.16 ft | on 03-07-2011 | |
| 7. | 11.00 ft | on 10-09-1903 | 1 |
| 8. | 10.76 ft | on 08-28-1971 | |
| 9. | 10.72 ft | on 03-11-2011 | |
| 10. | 10.50 ft | on 12-21-1973 | |
| 11. | 10.40 ft | on 09-22-1938 | |
| 12. | 9.90 ft | on 01-25-1979 | |
| 13. | 9.87 ft | on 04-03-2005 | |
| 14. | 9.85 ft | on 10-13-2005 | |
| 15. | 9.77 ft | on 02-03-1973 | |
| 16. | 9.55 ft | on 04-17-2011 | |
| 17. | 9.33 ft | on 12-21-1957 | |
| 18. | 8.88 ft | on 11-12-1995 | |
| 19. | 8.87 ft | on 02-26-1961 | |
| 20. | 8.80 ft | on 12-11-2003 | |
| 21. | 8.69 ft | on 01-25-1996 | |
| 22. | 8.40 ft | on 01-05-1982 | |
| 23. | 8.07 ft | on 12-12-2008 |
Unique Local Info
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Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels |
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| 10 Day (HEFS) | 7 Day (NAEFS) | 7 Day (GEFS) |
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Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.
See the Product Description Document link for more details on the interpretation of the 3,7 day graphics.Â
Click individual graphics to enlarge.
Forecasts for the Ramapo River at Mahwah are issued as needed during times of high water, and are routinely available.Collaborative Agencies
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.