Raritan River at Manville
No watches, warnings or advisories are in effect for this area.
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
- Upstream gauge unavailableWarning: 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) 06/18/2025 11:15 AM EDTOfficial Forecast (FCST) 06/18/2025 10:01 AM EDTRecord: 27.7 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 20 ft Moderate Flooding 17 ft Minor Flooding 14 ft Action 12 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
- 20 - Flooding becomes widespread across Manville. Flooding expands between Dukes Parkway and Brooks Blvd. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone.
- 19 - South Bridge Street in Somerville is closed. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone. Old York Road and Robert Street floods. Old York Road and Park Drive floods.
- 18 - East Dukes Parkway and several bridges in Manville are flooded. Roads throughout the area are closed due to high water. The amount of flooding can vary from event to event and can be affected by the amount of water in the Millstone.
Gauge Info
| Coordinates | 40.5556, -74.5828 |
| RFC | MARFC |
| State | NJ |
| WFO | PHI |
| County | Somerset |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 01400500 |
Gauge Location
Recent Crests
| 1. | 20.04 ft | on 01-10-2024 |
| 2. | 16.45 ft | on 12-28-2023 |
| 3. | 19.84 ft | on 12-19-2023 |
| 4. | 15.99 ft | on 04-08-2022 |
| 5. | 27.66 ft | on 09-02-2021 |
Recent Crests
| 1. | 20.04 ft | on 01-10-2024 |
| 2. | 16.45 ft | on 12-28-2023 |
| 3. | 19.84 ft | on 12-19-2023 |
| 4. | 15.99 ft | on 04-08-2022 |
| 5. | 27.66 ft | on 09-02-2021 |
| 6. | 16.61 ft | on 08-24-2021 |
| 7. | 14.00 ft | on 07-18-2021 |
| 8. | 14.68 ft | on 12-25-2020 |
| 9. | 14.02 ft | on 12-01-2020 |
| 10. | 16.12 ft | on 11-25-2018 |
| 11. | 19.99 ft | on 05-01-2014 |
| 12. | 19.18 ft | on 09-08-2011 |
| 13. | 26.24 ft | on 08-28-2011 |
| 14. | 17.30 ft | on 04-17-2011 |
| 15. | 14.94 ft | on 03-11-2011 |
| 16. | 14.89 ft | on 03-07-2011 |
| 17. | 14.76 ft | on 03-31-2010 |
| 18. | 21.57 ft | on 03-14-2010 |
| 19. | 22.30 ft | on 04-16-2007 |
| 20. | 16.96 ft | on 04-03-2005 |
| 21. | 16.60 ft | on 12-11-2003 |
| 22. | 27.10 ft | on 09-17-1999 |
| 23. | 14.80 ft | on 03-22-1999 |
| 24. | 13.00 ft | on 01-19-1999 |
| 25. | 12.26 ft | on 04-10-1998 |
| 26. | 12.26 ft | on 01-24-1998 |
| 27. | 14.80 ft | on 12-14-1996 |
| 28. | 15.67 ft | on 12-02-1996 |
| 29. | 22.41 ft | on 10-20-1996 |
| 30. | 14.30 ft | on 01-28-1996 |
| 31. | 19.82 ft | on 01-20-1996 |
| 32. | 14.95 ft | on 03-10-1994 |
| 33. | 15.55 ft | on 01-29-1994 |
| 34. | 14.48 ft | on 12-05-1993 |
| 35. | 13.32 ft | on 03-24-1993 |
| 36. | 15.13 ft | on 12-11-1992 |
| 37. | 16.24 ft | on 09-21-1989 |
| 38. | 19.95 ft | on 07-07-1984 |
| 39. | 16.78 ft | on 05-30-1984 |
| 40. | 17.50 ft | on 04-05-1984 |
| 41. | 18.39 ft | on 04-16-1983 |
| 42. | 16.60 ft | on 01-05-1982 |
| 43. | 17.89 ft | on 06-23-1972 |
| 44. | 23.80 ft | on 08-28-1971 |
| 45. | 19.60 ft | on 10-15-1955 |
| 46. | 21.80 ft | on 08-19-1955 |
| 47. | 19.90 ft | on 08-13-1955 |
| 48. | 20.42 ft | on 09-22-1938 |
Historic Crests
| 1. | 27.66 ft | on 09-02-2021 |
| 2. | 27.10 ft | on 09-17-1999 |
| 3. | 26.24 ft | on 08-28-2011 |
| 4. | 23.80 ft | on 08-28-1971 |
| 5. | 22.41 ft | on 10-20-1996 |
Historic Crests
| 1. | 27.66 ft | on 09-02-2021 |
| 2. | 27.10 ft | on 09-17-1999 |
| 3. | 26.24 ft | on 08-28-2011 |
| 4. | 23.80 ft | on 08-28-1971 |
| 5. | 22.41 ft | on 10-20-1996 |
| 6. | 22.30 ft | on 04-16-2007 |
| 7. | 21.80 ft | on 08-19-1955 |
| 8. | 21.57 ft | on 03-14-2010 |
| 9. | 20.42 ft | on 09-22-1938 |
| 10. | 20.04 ft | on 01-10-2024 |
| 11. | 19.99 ft | on 05-01-2014 |
| 12. | 19.95 ft | on 07-07-1984 |
| 13. | 19.90 ft | on 08-13-1955 |
| 14. | 19.84 ft | on 12-19-2023 |
| 15. | 19.82 ft | on 01-20-1996 |
| 16. | 19.60 ft | on 10-15-1955 |
| 17. | 19.18 ft | on 09-08-2011 |
| 18. | 18.39 ft | on 04-16-1983 |
| 19. | 17.89 ft | on 06-23-1972 |
| 20. | 17.50 ft | on 04-05-1984 |
| 21. | 17.30 ft | on 04-17-2011 |
| 22. | 16.96 ft | on 04-03-2005 |
| 23. | 16.78 ft | on 05-30-1984 |
| 24. | 16.61 ft | on 08-24-2021 |
| 25. | 16.60 ft | on 12-11-2003 |
| 26. | 16.60 ft | on 01-05-1982 |
| 27. | 16.45 ft | on 12-28-2023 |
| 28. | 16.24 ft | on 09-21-1989 |
| 29. | 16.12 ft | on 11-25-2018 |
| 30. | 15.99 ft | on 04-08-2022 |
| 31. | 15.67 ft | on 12-02-1996 |
| 32. | 15.55 ft | on 01-29-1994 |
| 33. | 15.13 ft | on 12-11-1992 |
| 34. | 14.95 ft | on 03-10-1994 |
| 35. | 14.94 ft | on 03-11-2011 |
| 36. | 14.89 ft | on 03-07-2011 |
| 37. | 14.80 ft | on 03-22-1999 |
| 38. | 14.80 ft | on 12-14-1996 |
| 39. | 14.76 ft | on 03-31-2010 |
| 40. | 14.68 ft | on 12-25-2020 |
| 41. | 14.48 ft | on 12-05-1993 |
| 42. | 14.30 ft | on 01-28-1996 |
| 43. | 14.02 ft | on 12-01-2020 |
| 44. | 14.00 ft | on 07-18-2021 |
| 45. | 13.32 ft | on 03-24-1993 |
| 46. | 13.00 ft | on 01-19-1999 |
| 47. | 12.26 ft | on 01-24-1998 |
| 48. | 12.26 ft | on 04-10-1998 |
Vertical Datum Table
| type | NGVD29 |
|---|---|
| major Flooding | 40.61 ft |
| moderate Flooding | 37.61 ft |
| minor Flooding | 34.61 ft |
| action | 32.61 ft |
| Latest Value | 25.17 ft |
| Gauge Zero | 20.61 ft |
Gauge Photos
No Images Found
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) | 10 Day (NAEFS) | 10 Day (GEFS) |
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Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.
Click individual graphics to enlarge.
During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.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.
Resources
Hydrologic Resource Links
Additional Resource Links
WFO Information
Weather Forecast Office
Philadelphia/Mount Holly
732 Woodlane Road
Mount Holly, NJ 08060-9615
Official Homepage