Assabet River at Maynard
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 unavailableDownstream 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) 04/02/2025 9:15 PM EDTOfficial Forecast (FCST) 04/02/2025 10:48 AM EDTRecord: 8.9 ftCATEGORY STAGE 
Major Flooding 7 ft Moderate Flooding 6 ft Minor Flooding 5 ft Action 4.5 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
- 7 - Significant flooding will affect interests along the river in Maynard, Concord and Hudson. Roadways may become impassable due to flood waters and some properties may need to be evacuated. Follow the directions of local emergency management officials.
- 6 - Flooding is likely in low lying sections along the river including portions of Maynard, Hudson and Concord. Water may approach homes along the river and may force several localized road closures.
- 5 - Minor lowland and backyard flooding is likely along reaches of the river in Maynard, Concord as well as Hudson. Several river roads may also become covered in water.
Gauge Info
| Coordinates | 42.4320, -71.4498 |
| RFC | NERFC |
| State | MA |
| WFO | BOX |
| County | Middlesex |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 01097000 |
Gauge Location
Recent Crests
| 1. | 5.60 ft | on 01-12-2024 |
| 2. | 5.94 ft | on 12-20-2023 |
| 3. | 5.14 ft | on 03-15-2023 |
| 4. | 5.27 ft | on 09-03-2021 |
| 5. | 5.13 ft | on 11-28-2018 |
Recent Crests
| 1. | 5.60 ft | on 01-12-2024 |
| 2. | 5.94 ft | on 12-20-2023 |
| 3. | 5.14 ft | on 03-15-2023 |
| 4. | 5.27 ft | on 09-03-2021 |
| 5. | 5.13 ft | on 11-28-2018 |
| 6. | 5.20 ft | on 04-08-2017 |
| 7. | 5.17 ft | on 06-15-2013 |
| 8. | 5.09 ft | on 03-13-2011 |
| 9. | 5.56 ft | on 03-08-2011 |
| 10. | 7.08 ft | on 03-31-2010 |
| 11. | 5.44 ft | on 03-24-2010 |
| 12. | 7.14 ft | on 03-16-2010 |
| 13. | 6.39 ft | on 02-26-2010 |
| 14. | 5.59 ft | on 12-13-2008 |
| 15. | 5.77 ft | on 03-09-2008 |
| 16. | 5.23 ft | on 02-20-2008 |
| 17. | 6.28 ft | on 04-17-2007 |
| 18. | 5.38 ft | on 05-15-2006 |
| 19. | 5.20 ft | on 10-27-2005 |
| 20. | 5.52 ft | on 10-16-2005 |
| 21. | 5.71 ft | on 04-04-2005 |
| 22. | 5.47 ft | on 03-30-2005 |
| 23. | 5.95 ft | on 04-03-2004 |
| 24. | 4.84 ft | on 03-23-2003 |
| 25. | 6.41 ft | on 03-23-2001 |
| 26. | 5.62 ft | on 04-24-2000 |
| 27. | 5.49 ft | on 06-15-1998 |
| 28. | 5.10 ft | on 05-12-1998 |
| 29. | 5.61 ft | on 03-11-1998 |
| 30. | 5.52 ft | on 10-21-1997 |
| 31. | 5.80 ft | on 10-22-1996 |
| 32. | 5.55 ft | on 01-29-1996 |
| 33. | 5.19 ft | on 03-24-1994 |
| 34. | 6.37 ft | on 04-02-1993 |
| 35. | 7.17 ft | on 04-07-1987 |
| 36. | 5.46 ft | on 03-16-1986 |
| 37. | 6.25 ft | on 06-03-1984 |
| 38. | 5.48 ft | on 03-13-1983 |
| 39. | 6.68 ft | on 06-07-1982 |
| 40. | 4.51 ft | on 02-27-1981 |
| 41. | 4.85 ft | on 03-23-1980 |
| 42. | 8.11 ft | on 01-26-1979 |
| 43. | 5.63 ft | on 03-29-1978 |
| 44. | 5.37 ft | on 03-15-1977 |
| 45. | 5.01 ft | on 01-28-1976 |
| 46. | 5.02 ft | on 02-26-1975 |
| 47. | 4.65 ft | on 03-23-1974 |
| 48. | 5.20 ft | on 02-04-1973 |
| 49. | 5.89 ft | on 03-23-1972 |
| 50. | 4.51 ft | on 03-17-1972 |
| 51. | 6.14 ft | on 02-12-1970 |
| 52. | 6.02 ft | on 03-27-1969 |
| 53. | 8.15 ft | on 03-19-1968 |
| 54. | 4.92 ft | on 05-27-1967 |
| 55. | 6.12 ft | on 03-28-1963 |
| 56. | 5.99 ft | on 04-02-1962 |
| 57. | 5.01 ft | on 04-18-1961 |
| 58. | 5.35 ft | on 04-01-1960 |
| 59. | 5.26 ft | on 04-04-1959 |
| 60. | 5.38 ft | on 01-28-1958 |
| 61. | 5.48 ft | on 01-11-1956 |
| 62. | 8.94 ft | on 08-20-1955 |
| 63. | 6.47 ft | on 09-13-1954 |
| 64. | 5.12 ft | on 03-17-1953 |
| 65. | 4.93 ft | on 11-09-1951 |
| 66. | 4.72 ft | on 02-19-1951 |
| 67. | 5.75 ft | on 03-21-1948 |
| 68. | 5.16 ft | on 03-09-1946 |
| 69. | 4.88 ft | on 03-07-1945 |
| 70. | 4.79 ft | on 03-21-1943 |
| 71. | 5.00 ft | on 03-19-1942 |
Historic Crests
| 1. | 8.94 ft | on 08-20-1955 |
| 2. | 8.15 ft | on 03-19-1968 |
| 3. | 8.11 ft | on 01-26-1979 |
| 4. | 7.17 ft | on 04-07-1987 |
| 5. | 7.14 ft | on 03-16-2010 |
Historic Crests
| 1. | 8.94 ft | on 08-20-1955 |
| 2. | 8.15 ft | on 03-19-1968 |
| 3. | 8.11 ft | on 01-26-1979 |
| 4. | 7.17 ft | on 04-07-1987 |
| 5. | 7.14 ft | on 03-16-2010 |
| 6. | 7.08 ft | on 03-31-2010 |
| 7. | 6.68 ft | on 06-07-1982 |
| 8. | 6.47 ft | on 09-13-1954 |
| 9. | 6.41 ft | on 03-23-2001 |
| 10. | 6.39 ft | on 02-26-2010 |
| 11. | 6.37 ft | on 04-02-1993 |
| 12. | 6.28 ft | on 04-17-2007 |
| 13. | 6.25 ft | on 06-03-1984 |
| 14. | 6.14 ft | on 02-12-1970 |
| 15. | 6.12 ft | on 03-28-1963 |
| 16. | 6.02 ft | on 03-27-1969 |
| 17. | 5.99 ft | on 04-02-1962 |
| 18. | 5.95 ft | on 04-03-2004 |
| 19. | 5.94 ft | on 12-20-2023 |
| 20. | 5.89 ft | on 03-23-1972 |
| 21. | 5.80 ft | on 10-22-1996 |
| 22. | 5.77 ft | on 03-09-2008 |
| 23. | 5.75 ft | on 03-21-1948 |
| 24. | 5.71 ft | on 04-04-2005 |
| 25. | 5.63 ft | on 03-29-1978 |
| 26. | 5.62 ft | on 04-24-2000 |
| 27. | 5.61 ft | on 03-11-1998 |
| 28. | 5.60 ft | on 01-12-2024 |
| 29. | 5.59 ft | on 12-13-2008 |
| 30. | 5.56 ft | on 03-08-2011 |
| 31. | 5.55 ft | on 01-29-1996 |
| 32. | 5.52 ft | on 10-21-1997 |
| 33. | 5.52 ft | on 10-16-2005 |
| 34. | 5.49 ft | on 06-15-1998 |
| 35. | 5.48 ft | on 03-13-1983 |
| 36. | 5.48 ft | on 01-11-1956 |
| 37. | 5.47 ft | on 03-30-2005 |
| 38. | 5.46 ft | on 03-16-1986 |
| 39. | 5.44 ft | on 03-24-2010 |
| 40. | 5.38 ft | on 05-15-2006 |
| 41. | 5.38 ft | on 01-28-1958 |
| 42. | 5.37 ft | on 03-15-1977 |
| 43. | 5.35 ft | on 04-01-1960 |
| 44. | 5.27 ft | on 09-03-2021 |
| 45. | 5.26 ft | on 04-04-1959 |
| 46. | 5.23 ft | on 02-20-2008 |
| 47. | 5.20 ft | on 02-04-1973 |
| 48. | 5.20 ft | on 10-27-2005 |
| 49. | 5.20 ft | on 04-08-2017 |
| 50. | 5.19 ft | on 03-24-1994 |
| 51. | 5.17 ft | on 06-15-2013 |
| 52. | 5.16 ft | on 03-09-1946 |
| 53. | 5.14 ft | on 03-15-2023 |
| 54. | 5.13 ft | on 11-28-2018 |
| 55. | 5.12 ft | on 03-17-1953 |
| 56. | 5.10 ft | on 05-12-1998 |
| 57. | 5.09 ft | on 03-13-2011 |
| 58. | 5.02 ft | on 02-26-1975 |
| 59. | 5.01 ft | on 01-28-1976 |
| 60. | 5.01 ft | on 04-18-1961 |
| 61. | 5.00 ft | on 03-19-1942 |
| 62. | 4.93 ft | on 11-09-1951 |
| 63. | 4.92 ft | on 05-27-1967 |
| 64. | 4.88 ft | on 03-07-1945 |
| 65. | 4.85 ft | on 03-23-1980 |
| 66. | 4.84 ft | on 03-23-2003 |
| 67. | 4.79 ft | on 03-21-1943 |
| 68. | 4.72 ft | on 02-19-1951 |
| 69. | 4.65 ft | on 03-23-1974 |
| 70. | 4.51 ft | on 02-27-1981 |
| 71. | 4.51 ft | on 03-17-1972 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 153.00 ft |
| moderate Flooding | 152.00 ft |
| minor Flooding | 151.00 ft |
| action | 150.50 ft |
| Latest Value | 149.13 ft |
| Gauge Zero | 146.00 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.
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.