Mermentau River at Mermentau
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
- 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) 06/25/2025 2:15 PM CDTOfficial Forecast (FCST) 06/25/2025 8:43 AM CDTRecord: 14.5 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 8 ft Moderate Flooding 6 ft Minor Flooding 4 ft Action 4 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.
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
- 16 - Between 16 and 17 ft, flood waters reach the gauge over the mermentau river.
- 15.1 - Between 15.1 and 16.0 ft, flood waters reach the base of the southern pacific railroad bridge east of mermentau across an unnamed tributary.
- 14.3 - The river is at its flood of record. Widespread major to catastrophic flooding will occur.
Gauge Location
Recent Crests
| 1. | 4.34 ft | on 10-01-2022 |
| 2. | 7.48 ft | on 05-22-2021 |
| 3. | 5.90 ft | on 10-15-2020 |
| 4. | 5.46 ft | on 08-31-2020 |
| 5. | 6.23 ft | on 05-14-2019 |
Recent Crests
| 1. | 4.34 ft | on 10-01-2022 |
| 2. | 7.48 ft | on 05-22-2021 |
| 3. | 5.90 ft | on 10-15-2020 |
| 4. | 5.46 ft | on 08-31-2020 |
| 5. | 6.23 ft | on 05-14-2019 |
| 6. | 3.41 ft | on 02-12-2018 |
| 7. | 8.61 ft | on 05-06-2017 |
| 8. | 10.68 ft | on 08-18-2016 |
| 9. | 4.05 ft | on 06-16-2015 |
| 10. | 4.77 ft | on 04-20-2015 |
| 11. | 4.02 ft | on 06-02-2014 |
| 12. | 4.11 ft | on 06-01-2014 |
| 13. | 10.56 ft | on 01-15-2013 |
| 14. | 4.49 ft | on 03-17-2012 |
| 15. | 4.78 ft | on 02-23-2012 |
| 16. | 4.23 ft | on 01-13-2012 |
| 17. | 4.55 ft | on 12-19-2009 |
| 18. | 4.11 ft | on 11-02-2009 |
| 19. | 5.09 ft | on 04-23-2009 |
| 20. | 5.28 ft | on 09-16-2008 |
| 21. | 6.25 ft | on 10-31-2006 |
| 22. | 6.46 ft | on 09-28-2005 |
| 23. | 5.98 ft | on 09-27-2005 |
| 24. | 8.96 ft | on 05-18-2004 |
| 25. | 6.89 ft | on 11-06-2002 |
| 26. | 3.88 ft | on 04-12-2002 |
| 27. | 4.99 ft | on 09-06-2001 |
| 28. | 5.06 ft | on 06-11-2001 |
| 29. | 2.81 ft | on 05-08-2000 |
| 30. | 5.11 ft | on 01-11-1999 |
| 31. | 6.91 ft | on 09-16-1998 |
| 32. | 5.90 ft | on 01-13-1998 |
| 33. | 6.64 ft | on 10-30-1996 |
| 34. | 4.22 ft | on 11-19-1993 |
| 35. | 6.05 ft | on 04-11-1993 |
| 36. | 5.87 ft | on 05-13-1991 |
| 37. | 6.45 ft | on 01-29-1990 |
| 38. | 8.13 ft | on 07-06-1989 |
| 39. | 4.89 ft | on 02-08-1988 |
| 40. | 4.98 ft | on 01-22-1987 |
| 41. | 6.42 ft | on 10-26-1984 |
| 42. | 8.56 ft | on 05-20-1980 |
| 43. | 6.80 ft | on 06-04-1979 |
| 44. | 9.05 ft | on 04-25-1977 |
| 45. | 6.31 ft | on 01-13-1975 |
| 46. | 7.46 ft | on 01-28-1974 |
| 47. | 7.74 ft | on 04-21-1973 |
| 48. | 9.47 ft | on 12-10-1972 |
| 49. | 5.16 ft | on 09-20-1971 |
| 50. | 8.02 ft | on 04-18-1969 |
| 51. | 8.54 ft | on 04-18-1967 |
| 52. | 6.94 ft | on 02-17-1966 |
| 53. | 5.46 ft | on 03-04-1965 |
| 54. | 6.45 ft | on 02-23-1961 |
| 55. | 6.20 ft | on 02-05-1959 |
| 56. | 7.43 ft | on 06-30-1957 |
| 57. | 5.32 ft | on 03-07-1948 |
| 58. | 5.95 ft | on 01-20-1947 |
| 59. | 8.27 ft | on 07-10-1946 |
| 60. | 6.60 ft | on 09-24-1943 |
| 61. | 5.30 ft | on 06-13-1942 |
| 62. | 8.66 ft | on 06-02-1941 |
| 63. | 14.50 ft | on 08-07-1940 |
Historic Crests
| 1. | 14.50 ft | on 08-07-1940 |
| 2. | 10.68 ft | on 08-18-2016 |
| 3. | 10.56 ft | on 01-15-2013 |
| 4. | 9.47 ft | on 12-10-1972 |
| 5. | 9.05 ft | on 04-25-1977 |
Historic Crests
| 1. | 14.50 ft | on 08-07-1940 |
| 2. | 10.68 ft | on 08-18-2016 |
| 3. | 10.56 ft | on 01-15-2013 |
| 4. | 9.47 ft | on 12-10-1972 |
| 5. | 9.05 ft | on 04-25-1977 |
| 6. | 8.96 ft | on 05-18-2004 |
| 7. | 8.66 ft | on 06-02-1941 |
| 8. | 8.61 ft | on 05-06-2017 |
| 9. | 8.56 ft | on 05-20-1980 |
| 10. | 8.54 ft | on 04-18-1967 |
| 11. | 8.27 ft | on 07-10-1946 |
| 12. | 8.13 ft | on 07-06-1989 |
| 13. | 8.02 ft | on 04-18-1969 |
| 14. | 7.74 ft | on 04-21-1973 |
| 15. | 7.48 ft | on 05-22-2021 |
| 16. | 7.46 ft | on 01-28-1974 |
| 17. | 7.43 ft | on 06-30-1957 |
| 18. | 6.94 ft | on 02-17-1966 |
| 19. | 6.91 ft | on 09-16-1998 |
| 20. | 6.89 ft | on 11-06-2002 |
| 21. | 6.80 ft | on 06-04-1979 |
| 22. | 6.64 ft | on 10-30-1996 |
| 23. | 6.60 ft | on 09-24-1943 |
| 24. | 6.46 ft | on 09-28-2005 |
| 25. | 6.45 ft | on 02-23-1961 |
| 26. | 6.45 ft | on 01-29-1990 |
| 27. | 6.42 ft | on 10-26-1984 |
| 28. | 6.31 ft | on 01-13-1975 |
| 29. | 6.25 ft | on 10-31-2006 |
| 30. | 6.23 ft | on 05-14-2019 |
| 31. | 6.20 ft | on 02-05-1959 |
| 32. | 6.05 ft | on 04-11-1993 |
| 33. | 5.98 ft | on 09-27-2005 |
| 34. | 5.95 ft | on 01-20-1947 |
| 35. | 5.90 ft | on 10-15-2020 |
| 36. | 5.90 ft | on 01-13-1998 |
| 37. | 5.87 ft | on 05-13-1991 |
| 38. | 5.46 ft | on 08-31-2020 |
| 39. | 5.46 ft | on 03-04-1965 |
| 40. | 5.32 ft | on 03-07-1948 |
| 41. | 5.30 ft | on 06-13-1942 |
| 42. | 5.28 ft | on 09-16-2008 |
| 43. | 5.16 ft | on 09-20-1971 |
| 44. | 5.11 ft | on 01-11-1999 |
| 45. | 5.09 ft | on 04-23-2009 |
| 46. | 5.06 ft | on 06-11-2001 |
| 47. | 4.99 ft | on 09-06-2001 |
| 48. | 4.98 ft | on 01-22-1987 |
| 49. | 4.89 ft | on 02-08-1988 |
| 50. | 4.78 ft | on 02-23-2012 |
| 51. | 4.77 ft | on 04-20-2015 |
| 52. | 4.55 ft | on 12-19-2009 |
| 53. | 4.49 ft | on 03-17-2012 |
| 54. | 4.34 ft | on 10-01-2022 |
| 55. | 4.23 ft | on 01-13-2012 |
| 56. | 4.22 ft | on 11-19-1993 |
| 57. | 4.11 ft | on 11-02-2009 |
| 58. | 4.11 ft | on 06-01-2014 |
| 59. | 4.05 ft | on 06-16-2015 |
| 60. | 4.02 ft | on 06-02-2014 |
| 61. | 3.88 ft | on 04-12-2002 |
| 62. | 3.41 ft | on 02-12-2018 |
| 63. | 2.81 ft | on 05-08-2000 |
Vertical Datum Table
| type | NAVD88 | NGVD29 |
|---|---|---|
| major Flooding | 6.71 ft | 7.42 ft |
| moderate Flooding | 4.71 ft | 5.42 ft |
| minor Flooding | 2.71 ft | 3.42 ft |
| action | 2.71 ft | 3.42 ft |
| Latest Value | 1.81 ft | 2.52 ft |
| Gauge Zero | -1.29 ft | -0.58 ft |
Gauge Photos
No Images Found
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
- River Forecast Centers
- Text Products
- Past Precipitation
- Forecast Precipitation
- Lower Mississippi River Forecast Center
- West Gulf River Forecast Center
- USGS Water Science
- USACE Hydrologic Information
- Jefferson County Drainage District 6
- Agriculture Weather Report
- Daily Precipitation Reports
- COCORAHS Reports
- Interactive Map of Rainfall Reports
- Inundation Mapping Locations