Major Flood
28.5 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
24.8 ft
Minor Flood
23.5 ft
Action Stage
21.5 ft
What Floods at Each Level
31 ft
Notification level 9 with 43 to 53 gates open at Conowingo dam.
29.4 ft
Notification level 8 with 36 to 42 gates open at Conowingo Dam.
28.5 ft
Notification level 7 with 33 to 35 gates open at Conowingo Dam.
26.3 ft
Notification level 6 with 26 to 32 gates open at Conowingo Dam.
24.8 ft
Backyards and basements on Main Street and Tome's Landing begin to flood.
23.7 ft
Minor flooding begins in the town of Port Deposit, Maryland.
22.9 ft
Maryland Route 222 north of Port Deposit is closed.
21.5 ft
Notification level 2 with 12 to 15 gates open at Conowingo Dam.
20 ft
Notification level 1 with 10 to 11 gates open at Conowingo Dam.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 23, 1972 | 36.83 ft | 1,130,000 cfs |
| Jan 19, 1996 | 34.18 ft | 909,000 cfs |
| Sep 9, 2011 | 32.41 ft | 777,700 cfs |
About This Gauge
USGS Site
NWS LID
CNWM2
River
Susquehanna River
County
Cecil, MD
Coordinates
39.6578°N, 76.1744°W
Get Flood Alerts for Susquehanna River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Susquehanna River at Conowingo Dam?
The Susquehanna River at Conowingo Dam gauge is maintained by USGS (site 01578310) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Susquehanna River at Conowingo Dam?
The NWS-defined flood stage for Susquehanna River at Conowingo Dam is 23.5 feet. Action stage begins at 21.5 feet. Moderate flooding starts at 24.8 feet, and major flooding at 28.5 feet.
How do I get alerts when Susquehanna River rises?
Download StormCast free on Google Play, go to River Gauges, and add Susquehanna River at Conowingo Dam to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Susquehanna River at Conowingo Dam gauge located?
The gauge is located in Cecil County, Maryland at coordinates 39.6578°N, 76.1744°W. USGS site number: 01578310. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
Upstream: Susquehanna River at Marietta
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Gauge reading affected by power generation.