Susquehanna River at Conowingo Dam
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
- Downstream 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) 04/04/2025 3:35 PM EDTRecord: 36.8 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 28.5 ft Moderate Flooding 24.8 ft Minor Flooding 23.5 ft Action 21.5 ft Reliability of the Forecast:
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
Gauge reading affected by power generation.
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
- 31 - Notification level 9 with 43 to 53 gates open at Conowingo dam.
- 29.4 - Notification level 8 with 36 to 42 gates open at Conowingo Dam.
- 28.5 - Notification level 7 with 33 to 35 gates open at Conowingo Dam.
Gauge Info
| Coordinates | 39.6578, -76.1744 |
| RFC | MARFC |
| State | MD |
| WFO | LWX |
| County | Cecil |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 01578310 |
Gauge Location
Recent Crests
| 1. | 24.29 ft | on 09-03-2021 |
| 2. | 22.32 ft | on 05-02-2020 |
| 3. | 21.52 ft | on 11-28-2018 |
| 4. | 26.08 ft | on 07-26-2018 |
| 5. | 21.60 ft | on 02-02-2013 |
Recent Crests
| 1. | 24.29 ft | on 09-03-2021 |
| 2. | 22.32 ft | on 05-02-2020 |
| 3. | 21.52 ft | on 11-28-2018 |
| 4. | 26.08 ft | on 07-26-2018 |
| 5. | 21.60 ft | on 02-02-2013 |
| 6. | 32.41 ft | on 09-09-2011 |
| 7. | 25.12 ft | on 04-29-2011 |
| 8. | 23.46 ft | on 04-19-2011 |
| 9. | 21.52 ft | on 03-11-2011 |
| 10. | 24.37 ft | on 01-27-2010 |
| 11. | 25.64 ft | on 03-06-2008 |
| 12. | 23.04 ft | on 03-17-2007 |
| 13. | 27.31 ft | on 06-29-2006 |
| 14. | 26.70 ft | on 04-04-2005 |
| 15. | 30.07 ft | on 09-19-2004 |
| 16. | 23.88 ft | on 01-16-2004 |
| 17. | 24.15 ft | on 03-22-2003 |
| 18. | 21.62 ft | on 05-15-2002 |
| 19. | 22.12 ft | on 02-29-2000 |
| 20. | 22.90 ft | on 01-26-1999 |
| 21. | 25.55 ft | on 01-10-1998 |
| 22. | 24.04 ft | on 11-11-1996 |
| 23. | 34.18 ft | on 01-20-1996 |
| 24. | 21.74 ft | on 01-22-1995 |
| 25. | 26.16 ft | on 03-23-1994 |
| 26. | 28.06 ft | on 04-02-1993 |
| 27. | 23.03 ft | on 10-26-1990 |
| 28. | 23.48 ft | on 05-18-1989 |
| 29. | 21.64 ft | on 02-04-1988 |
| 30. | 23.13 ft | on 04-07-1987 |
| 31. | 26.17 ft | on 03-16-1986 |
| 32. | 28.08 ft | on 02-16-1984 |
| 33. | 23.31 ft | on 04-17-1983 |
| 34. | 23.02 ft | on 02-05-1982 |
| 35. | 25.18 ft | on 02-25-1981 |
| 36. | 22.45 ft | on 03-23-1980 |
| 37. | 28.04 ft | on 03-07-1979 |
| 38. | 25.64 ft | on 01-28-1978 |
| 39. | 23.99 ft | on 10-10-1976 |
| 40. | 24.65 ft | on 01-28-1976 |
| 41. | 30.92 ft | on 09-27-1975 |
| 42. | 22.35 ft | on 04-05-1974 |
| 43. | 22.74 ft | on 12-09-1972 |
| 44. | 36.83 ft | on 06-24-1972 |
| 45. | 22.58 ft | on 02-22-1971 |
| 46. | 26.40 ft | on 02-04-1970 |
| 47. | 22.46 ft | on 03-25-1968 |
Historic Crests
| 1. | 36.83 ft | on 06-24-1972 |
| 2. | 34.18 ft | on 01-20-1996 |
| 3. | 32.41 ft | on 09-09-2011 |
| 4. | 30.92 ft | on 09-27-1975 |
| 5. | 30.07 ft | on 09-19-2004 |
Historic Crests
| 1. | 36.83 ft | on 06-24-1972 |
| 2. | 34.18 ft | on 01-20-1996 |
| 3. | 32.41 ft | on 09-09-2011 |
| 4. | 30.92 ft | on 09-27-1975 |
| 5. | 30.07 ft | on 09-19-2004 |
| 6. | 28.08 ft | on 02-16-1984 |
| 7. | 28.06 ft | on 04-02-1993 |
| 8. | 28.04 ft | on 03-07-1979 |
| 9. | 27.31 ft | on 06-29-2006 |
| 10. | 26.70 ft | on 04-04-2005 |
| 11. | 26.40 ft | on 02-04-1970 |
| 12. | 26.17 ft | on 03-16-1986 |
| 13. | 26.16 ft | on 03-23-1994 |
| 14. | 26.08 ft | on 07-26-2018 |
| 15. | 25.64 ft | on 01-28-1978 |
| 16. | 25.64 ft | on 03-06-2008 |
| 17. | 25.55 ft | on 01-10-1998 |
| 18. | 25.18 ft | on 02-25-1981 |
| 19. | 25.12 ft | on 04-29-2011 |
| 20. | 24.65 ft | on 01-28-1976 |
| 21. | 24.37 ft | on 01-27-2010 |
| 22. | 24.29 ft | on 09-03-2021 |
| 23. | 24.15 ft | on 03-22-2003 |
| 24. | 24.04 ft | on 11-11-1996 |
| 25. | 23.99 ft | on 10-10-1976 |
| 26. | 23.88 ft | on 01-16-2004 |
| 27. | 23.48 ft | on 05-18-1989 |
| 28. | 23.46 ft | on 04-19-2011 |
| 29. | 23.31 ft | on 04-17-1983 |
| 30. | 23.13 ft | on 04-07-1987 |
| 31. | 23.04 ft | on 03-17-2007 |
| 32. | 23.03 ft | on 10-26-1990 |
| 33. | 23.02 ft | on 02-05-1982 |
| 34. | 22.90 ft | on 01-26-1999 |
| 35. | 22.74 ft | on 12-09-1972 |
| 36. | 22.58 ft | on 02-22-1971 |
| 37. | 22.46 ft | on 03-25-1968 |
| 38. | 22.45 ft | on 03-23-1980 |
| 39. | 22.35 ft | on 04-05-1974 |
| 40. | 22.32 ft | on 05-02-2020 |
| 41. | 22.12 ft | on 02-29-2000 |
| 42. | 21.74 ft | on 01-22-1995 |
| 43. | 21.64 ft | on 02-04-1988 |
| 44. | 21.62 ft | on 05-15-2002 |
| 45. | 21.60 ft | on 02-02-2013 |
| 46. | 21.52 ft | on 03-11-2011 |
| 47. | 21.52 ft | on 11-28-2018 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 32.66 ft |
| moderate Flooding | 28.96 ft |
| minor Flooding | 27.66 ft |
| action | 25.66 ft |
| Latest Value | 15.83 ft |
| Gauge Zero | 4.16 ft |
Gauge Photos
No Images Found
Probability Information
No Images Available
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) | 7 Day (NAEFS) | 7 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.
During winter months, cold and ice may result in inaccurate real-time stream stage and streamflow data. 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.