Rehoboth Bay at Dewey Beach (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.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/07/2025 9:36 AM EDTRecord: 7.3 ftLow Threshold: -2 ftCATEGORY STAGE 
Major Flooding 5.3 ft Moderate Flooding 4.3 ft Minor Flooding 3.3 ft Reliability of the Forecast:
NOTE: Graphical forecasts are not available during times of high water, forecast crest information can be found in the local WFO web page.
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.
Flood impacts are based on long-term averages. Actual impacts from any tidal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow.
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
- 7.34 - (Mean Lower Low Water (MLLW)) The level reached on March 6, 1962.
- 5.73 - (MLLW) The level reached on October 29, 2021.
- 5.68 - (MLLW) The level reached on October 29, 2012 during Post Tropical Cyclone Sandy.
Gauge Info
| Coordinates | 38.6902, -75.0785 |
| RFC | MARFC |
| State | DE |
| WFO | PHI |
| County | Sussex |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 01484670 |
Gauge Location
Recent Crests
| 1. | 4.30 ft | on 11-15-2024 |
| 2. | 4.45 ft | on 09-23-2024 |
| 3. | 4.36 ft | on 04-12-2024 |
| 4. | 4.44 ft | on 01-10-2024 |
| 5. | 4.35 ft | on 12-18-2023 |
Recent Crests
| 1. | 4.30 ft | on 11-15-2024 |
| 2. | 4.45 ft | on 09-23-2024 |
| 3. | 4.36 ft | on 04-12-2024 |
| 4. | 4.44 ft | on 01-10-2024 |
| 5. | 4.35 ft | on 12-18-2023 |
| 6. | 4.37 ft | on 10-15-2023 |
| 7. | 5.00 ft | on 09-23-2023 |
| 8. | 4.49 ft | on 12-23-2022 |
| 9. | 4.74 ft | on 12-16-2022 |
| 10. | 4.99 ft | on 10-03-2022 |
| 11. | 4.59 ft | on 05-08-2022 |
| 12. | 5.73 ft | on 10-29-2021 |
| 13. | 4.33 ft | on 10-11-2021 |
| 14. | 4.34 ft | on 05-30-2021 |
| 15. | 4.51 ft | on 02-02-2021 |
| 16. | 4.41 ft | on 10-30-2020 |
| 17. | 4.30 ft | on 04-04-2020 |
| 18. | 4.34 ft | on 02-07-2020 |
| 19. | 4.47 ft | on 11-18-2019 |
| 20. | 5.04 ft | on 10-11-2019 |
| 21. | 4.37 ft | on 09-09-2018 |
| 22. | 4.69 ft | on 01-23-2016 |
| 23. | 4.38 ft | on 10-03-2015 |
| 24. | 5.68 ft | on 10-29-2012 |
| 25. | 4.30 ft | on 08-27-2011 |
| 26. | 4.74 ft | on 11-13-2009 |
| 27. | 4.52 ft | on 05-12-2008 |
| 28. | 7.34 ft | on 03-06-1962 |
Historic Crests
| 1. | 7.34 ft | on 03-06-1962 |
| 2. | 5.73 ft | on 10-29-2021 |
| 3. | 5.68 ft | on 10-29-2012 |
| 4. | 5.04 ft | on 10-11-2019 |
| 5. | 5.00 ft | on 09-23-2023 |
Historic Crests
| 1. | 7.34 ft | on 03-06-1962 |
| 2. | 5.73 ft | on 10-29-2021 |
| 3. | 5.68 ft | on 10-29-2012 |
| 4. | 5.04 ft | on 10-11-2019 |
| 5. | 5.00 ft | on 09-23-2023 |
| 6. | 4.99 ft | on 10-03-2022 |
| 7. | 4.74 ft | on 11-13-2009 |
| 8. | 4.74 ft | on 12-16-2022 |
| 9. | 4.69 ft | on 01-23-2016 |
| 10. | 4.59 ft | on 05-08-2022 |
| 11. | 4.52 ft | on 05-12-2008 |
| 12. | 4.51 ft | on 02-02-2021 |
| 13. | 4.49 ft | on 12-23-2022 |
| 14. | 4.47 ft | on 11-18-2019 |
| 15. | 4.45 ft | on 09-23-2024 |
| 16. | 4.44 ft | on 01-10-2024 |
| 17. | 4.41 ft | on 10-30-2020 |
| 18. | 4.38 ft | on 10-03-2015 |
| 19. | 4.37 ft | on 10-15-2023 |
| 20. | 4.37 ft | on 09-09-2018 |
| 21. | 4.36 ft | on 04-12-2024 |
| 22. | 4.35 ft | on 12-18-2023 |
| 23. | 4.34 ft | on 05-30-2021 |
| 24. | 4.34 ft | on 02-07-2020 |
| 25. | 4.33 ft | on 10-11-2021 |
| 26. | 4.30 ft | on 11-15-2024 |
| 27. | 4.30 ft | on 04-04-2020 |
| 28. | 4.30 ft | on 08-27-2011 |
Vertical Datum Table
| type | MLLW* | NAVD88 |
|---|---|---|
| major Flooding | 5.30 ft | 4.18 ft |
| moderate Flooding | 4.30 ft | 3.18 ft |
| minor Flooding | 3.30 ft | 2.18 ft |
| action | N/A | N/A |
| Latest Value | 2.33 ft | 1.21 ft |
| Gauge Zero | 0.00 ft | -1.12 ft |
Gauge Photos
No Images Found
Probability Information
No Images Available
Unique Local Info
All gage data is referenced in MLLW. During winter months, cold and ice may result in inaccurate real-time stages. 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.