Susquehanna River at Conowingo Dam, MD
River level and flood forecast · Cecil County
The river is 9.2 ft below flood stage (23.5 ft).
Flow: 50,300 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Susquehanna River at Conowingo Dam to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 28.5 ft |
| Moderate flood stage | 24.8 ft |
| Flood stage | 23.5 ft |
| Action stage | 21.5 ft |
| Record crest (June 24, 1972) | 36.83 ft |
What floods at each level
From the National Weather Service, highest first.
- 31 ftNotification level 9 with 43 to 53 gates open at Conowingo dam.
- 29.4 ftNotification level 8 with 36 to 42 gates open at Conowingo Dam.
- 28.5 ftNotification level 7 with 33 to 35 gates open at Conowingo Dam.
- 26.3 ftNotification level 6 with 26 to 32 gates open at Conowingo Dam.
- 24.8 ftBackyards and basements on Main Street and Tome's Landing begin to flood.
- 23.7 ftMinor flooding begins in the town of Port Deposit, Maryland.
- 22.9 ftMaryland Route 222 north of Port Deposit is closed.
- 21.5 ftNotification level 2 with 12 to 15 gates open at Conowingo Dam.
- 20 ftNotification level 1 with 10 to 11 gates open at Conowingo Dam.
Highest crests on record
- 36.83 ft — June 24, 1972
- 34.18 ft — January 20, 1996
- 32.41 ft — September 9, 2011
- 30.9200000762939 ft — September 27, 1975
- 30.07 ft — September 19, 2004
Recent crests: 24.29 ft (September 3, 2021) · 22.32 ft (May 2, 2020) · 21.52 ft (November 28, 2018) · 26.08 ft (July 26, 2018) · 21.6 ft (February 2, 2013)
Up and down the river, and nearby
- UpstreamSusquehanna River at Marietta, PA
- Deer Creek (MD) near Darlington, MD
- Octoraro Creek near Richardsmere, MD
- Chesapeake Bay at Havre de Grace, MD
- Swan Creek at Swan Creek, MD
- Muddy Creek (PA) near Castle Fin, PA
- Bynum Run at Bel Air, MD
- James Run near Belcamp, MD
- Deer Creek (MD) at Rocks State Park, MD
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (CNWM2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.