Atlantic Coast at Portland (IN MLLW)
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.No secondary data available. Transformations for Flow data and a secondary Y axis cannot be made at this time.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/22/2025 9:18 PM EDTOfficial Forecast (FCST) 06/22/2025 8:11 PM EDTLow Threshold: -3 ftCATEGORY STAGE 
Major Flooding 14 ft Moderate Flooding 13 ft Minor Flooding 12 ft Action 10.5 ft Reliability of the Forecast:
NOTE: Forecasts are issued routinely year-round.
Please refer to our Coastal Hazard Message for specific information regarding Coastal Flood Watches, Warnings and Advisories. During tropical cyclones, please refer here for additional storm surge information.
Coastal flood impacts are dependent upon waves as well as tide level. High waves can result in flooding even if the tide level is below flood stage.
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
- 13.8 - Water will enter and flood businesses along and near the Portland Pier. Water will be nearly two feet deep along Granite Point Road in Biddeford and Mile Stretch Road will be flooded. Roads and businesses will also flood in Wells and Kennebunkport.
- 13 - Water will reach the tailpipes of cars at businesses near the Portland Pier. At this elevation, a foot of water will also cover Granite Point Road in Biddeford
- 12.5 - Water will be eight to ten inches deep along several low lying side streets and wharfs along Portland Harbor with water up to the bottom of doors in parking lots east of the Portland Peir. Water will be eight to 10 inches deep covering Marginal Way in Portland with six to eight inches of water on Somserset Street.
Gauge Location
Recent Crests
| 1. | 14.85 ft | on 05-27-2025 | (P) |
| 2. | 13.32 ft | on 03-10-2024 | (P) |
| 3. | 14.57 ft | on 01-13-2024 | |
| 4. | 13.84 ft | on 01-10-2024 | |
| 5. | 13.72 ft | on 12-23-2022 |
Recent Crests
| 1. | 14.85 ft | on 05-27-2025 | (P) |
| 2. | 13.32 ft | on 03-10-2024 | (P) |
| 3. | 14.57 ft | on 01-13-2024 | |
| 4. | 13.84 ft | on 01-10-2024 | |
| 5. | 13.72 ft | on 12-23-2022 | |
| 6. | 12.90 ft | on 03-03-2018 | |
| 7. | 13.79 ft | on 01-04-2018 | |
| 8. | 12.96 ft | on 05-25-2017 | |
| 9. | 13.00 ft | on 06-04-2012 | |
| 10. | 13.03 ft | on 06-03-2012 | |
| 11. | 12.92 ft | on 01-02-2010 | |
| 12. | 12.90 ft | on 04-17-2007 | |
| 13. | 13.28 ft | on 04-16-2007 | |
| 14. | 13.18 ft | on 10-30-1991 | |
| 15. | 13.40 ft | on 12-04-1990 | |
| 16. | 13.18 ft | on 01-02-1987 | |
| 17. | 12.80 ft | on 12-03-1986 | |
| 18. | 13.07 ft | on 01-28-1979 | |
| 19. | 13.09 ft | on 04-07-1978 | |
| 20. | 14.17 ft | on 02-07-1978 | 1 |
| 21. | 13.98 ft | on 01-09-1978 | |
| 22. | 13.31 ft | on 03-16-1976 | |
| 23. | 13.09 ft | on 02-19-1972 | |
| 24. | 13.09 ft | on 12-29-1959 | |
| 25. | 13.29 ft | on 11-30-1945 | |
| 26. | 13.29 ft | on 11-20-1945 |
Historic Crests
| 1. | 14.85 ft | on 05-27-2025 | (P) |
| 2. | 14.57 ft | on 01-13-2024 | |
| 3. | 14.17 ft | on 02-07-1978 | 1 |
| 4. | 13.98 ft | on 01-09-1978 | |
| 5. | 13.84 ft | on 01-10-2024 |
Historic Crests
| 1. | 14.85 ft | on 05-27-2025 | (P) |
| 2. | 14.57 ft | on 01-13-2024 | |
| 3. | 14.17 ft | on 02-07-1978 | 1 |
| 4. | 13.98 ft | on 01-09-1978 | |
| 5. | 13.84 ft | on 01-10-2024 | |
| 6. | 13.79 ft | on 01-04-2018 | |
| 7. | 13.72 ft | on 12-23-2022 | |
| 8. | 13.40 ft | on 12-04-1990 | |
| 9. | 13.32 ft | on 03-10-2024 | (P) |
| 10. | 13.31 ft | on 03-16-1976 | |
| 11. | 13.29 ft | on 11-20-1945 | |
| 12. | 13.29 ft | on 11-30-1945 | |
| 13. | 13.28 ft | on 04-16-2007 | |
| 14. | 13.18 ft | on 10-30-1991 | |
| 15. | 13.18 ft | on 01-02-1987 | |
| 16. | 13.09 ft | on 04-07-1978 | |
| 17. | 13.09 ft | on 12-29-1959 | |
| 18. | 13.09 ft | on 02-19-1972 | |
| 19. | 13.07 ft | on 01-28-1979 | |
| 20. | 13.03 ft | on 06-03-2012 | |
| 21. | 13.00 ft | on 06-04-2012 | |
| 22. | 12.96 ft | on 05-25-2017 | |
| 23. | 12.92 ft | on 01-02-2010 | |
| 24. | 12.90 ft | on 03-03-2018 | |
| 25. | 12.90 ft | on 04-17-2007 | |
| 26. | 12.80 ft | on 12-03-1986 |
Gauge Photos
No Images Found
Probability Information
No Images Available
Unique Local Info
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Potential Tide Levels Used to Estimate the Chance of Flooding and the Range of Possible Tide Levels |
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| GFS Based Guidance (ETSS) | GEFS Based Guidance (P-ETSS) | NAEFS Based Guidance (P-ETSS) |
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Note: Use the official hydrograph at the top of this web page for tide levels within the next 72 hours.
The Potential Tide Level graphics above are from an EXPERIMENTAL web site. It is supported on an 8x5 basis, and has no guarantee of availability in the future. Please see information HERE to understand the strengths and weakness of the Potential Tide Level graphics. 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.