TidalMapSusquehanna River at Conowingo, MD Water Level Today
NWS river forecast
| When | Stage | Flow |
|---|
Forecast from the NOAA National Water Prediction Service. Issued a few times a day and only while a forecast is active. Not for navigation.
Last 30 days
About this gauge
USGS gauge 01578310 sits on the Susquehanna River and reads everything draining 27,100 square miles of the Lower Susquehanna basin. Its datum sits 4 feet above sea level NAVD88. Daily flow has been on record here since 1968, 58 years of it.
Normal flows here
The Susquehanna River runs a median of 31,250 cfs at this gauge across 58 years of record. April is the fullest month at a median 62,550 cfs, and September the leanest at 10,350 cfs. The highest daily mean on record is 1,120,000 cfs in 1972, and the lowest is 269 cfs in 1969.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 32,700 cfs | 105% |
| Feb | 36,200 cfs | 116% |
| Mar | 58,100 cfs | 186% |
| Apr | 62,550 cfs | 200% |
| May | 43,000 cfs | 138% |
| Jun | 24,900 cfs | 80% |
| Jul | 15,700 cfs | 50% |
| Aug | 11,400 cfs | 36% |
| Sep | 10,350 cfs | 33% |
| Oct | 14,300 cfs | 46% |
| Nov | 26,150 cfs | 84% |
| Dec | 40,100 cfs | 128% |
Medians from the USGS daily-statistics record, 1968 to 2026. A month at 100% is running at its own long-term median.
Flood stages and record crests
The Susquehanna River reaches flood stage at this gauge at 23.5 feet. NWS starts watching it at 21.5 feet. The highest crest on record is 36.8 feet, in June 1972.
| Category | Gage height |
|---|---|
| Action | 21.5 ft |
| Minor flooding | 23.5 ft |
| Moderate flooding | 24.8 ft |
| Major flooding | 28.5 ft |
| When | Crest |
|---|---|
| June 1972 | 36.8 ft |
| January 1996 | 34.2 ft |
| September 2011 | 32.4 ft |
| September 1975 | 30.9 ft |
| September 2004 | 30.1 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge CNWM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
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Live streamflow and gage height: USGS gauge 01578310. Percentile context computed against the gauge's period of record. Not for navigation.
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