Potomac River at Edwards Ferry
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.
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Observed (OBS) 04/01/2025 7:15 PM EDTOfficial Forecast (FCST) 04/01/2025 10:16 AM EDTCATEGORY STAGE 
Major Flooding 24 ft Moderate Flooding 17 ft Minor Flooding 15 ft Action 12.25 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
- 28 - Tchiffely Mill Road begins to flood due to backwater effects. Most of the C&O Canal towpath is flooded.
- 26 - Water covers the lock at Edwards Ferry. The access road to Violettes Lock is flooded.
- 24 - Water reaches the first floor ceiling at Whites Ferry store. Significant portions of the C&O Canal towpath are flooded. Backwater flooding is affecting homes on the Loudoun County side of the river near Broad Run in Sterling.
Gauge Info
| Coordinates | 39.0986, -77.4711 |
| RFC | MARFC |
| State | MD |
| WFO | LWX |
| County | Montgomery |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 01644148 |
Gauge Location
Recent Crests
| 1. | 15.17 ft | on 01-11-2024 | (P) |
| 2. | 18.45 ft | on 05-08-2022 | (P) |
| 3. | 16.91 ft | on 03-02-2021 | |
| 4. | 15.90 ft | on 05-02-2020 | (P) |
| 5. | 16.08 ft | on 12-23-2018 |
Recent Crests
| 1. | 15.17 ft | on 01-11-2024 | (P) |
| 2. | 18.45 ft | on 05-08-2022 | (P) |
| 3. | 16.91 ft | on 03-02-2021 | |
| 4. | 15.90 ft | on 05-02-2020 | (P) |
| 5. | 16.08 ft | on 12-23-2018 | |
| 6. | 20.98 ft | on 12-17-2018 | |
| 7. | 21.57 ft | on 09-29-2018 | |
| 8. | 21.80 ft | on 09-29-2018 | |
| 9. | 15.38 ft | on 09-27-2018 | |
| 10. | 20.31 ft | on 09-11-2018 | |
| 11. | 15.20 ft | on 06-24-2018 | |
| 12. | 22.45 ft | on 06-05-2018 | |
| 13. | 17.87 ft | on 05-20-2018 | |
| 14. | 15.13 ft | on 04-18-2018 | |
| 15. | 17.63 ft | on 02-05-2016 | |
| 16. | 21.09 ft | on 05-17-2014 | |
| 17. | 16.04 ft | on 05-10-2013 | |
| 18. | 16.63 ft | on 02-01-2013 | |
| 19. | 16.63 ft | on 02-01-2013 | |
| 20. | 19.77 ft | on 10-31-2012 |
Historic Crests
| 1. | 22.45 ft | on 06-05-2018 |
| 2. | 21.80 ft | on 09-29-2018 |
| 3. | 21.57 ft | on 09-29-2018 |
| 4. | 21.09 ft | on 05-17-2014 |
| 5. | 20.98 ft | on 12-17-2018 |
Historic Crests
| 1. | 22.45 ft | on 06-05-2018 | |
| 2. | 21.80 ft | on 09-29-2018 | |
| 3. | 21.57 ft | on 09-29-2018 | |
| 4. | 21.09 ft | on 05-17-2014 | |
| 5. | 20.98 ft | on 12-17-2018 | |
| 6. | 20.31 ft | on 09-11-2018 | |
| 7. | 19.77 ft | on 10-31-2012 | |
| 8. | 18.45 ft | on 05-08-2022 | (P) |
| 9. | 17.87 ft | on 05-20-2018 | |
| 10. | 17.63 ft | on 02-05-2016 | |
| 11. | 16.91 ft | on 03-02-2021 | |
| 12. | 16.63 ft | on 02-01-2013 | |
| 13. | 16.63 ft | on 02-01-2013 | |
| 14. | 16.08 ft | on 12-23-2018 | |
| 15. | 16.04 ft | on 05-10-2013 | |
| 16. | 15.90 ft | on 05-02-2020 | (P) |
| 17. | 15.38 ft | on 09-27-2018 | |
| 18. | 15.20 ft | on 06-24-2018 | |
| 19. | 15.17 ft | on 01-11-2024 | (P) |
| 20. | 15.13 ft | on 04-18-2018 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 202.70 ft |
| moderate Flooding | 195.70 ft |
| minor Flooding | 193.70 ft |
| action | 190.95 ft |
| Latest Value | 182.98 ft |
| Gauge Zero | 178.70 ft |
Gauge Photos
No Images Found
Probability Information
No Images Available
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.