The Susquehanna River monitoring station, at Conowingo Dam Hydroelectric Power Plant in Conowingo, MD, is approximately 10 miles from the river mouth and receives streamflow from 99 percent of the 27,510 mi2 Susquehanna River Basin. The Susquehanna River is the Bay's largest tributary and contributes about 60 percent of the total streamflow from the nontidal part of the Chesapeake Bay Basin. This river also is the single largest contributor of phosphorus and nitrogen loads.
The Susquehanna River drains parts of New York, Pennsylvania, and Maryland, including some of the most productive agricultural land in the nation. Because of the extensive agriculture in the lower Susquehanna River basin, the river has a relatively high yield of nitrogen. Phosphorus yields are relatively low at the monitoring station, probably because phosphorus tends to bind to sediment particles that settle to the river bottom and become trapped behind the reservoirs on the lower Susquehanna River.
| Station Number | 01578310 |
| Latitude (ddmmss) | 393931 |
| Longitude (ddmmss) | 761028 |
| County | Harford |
| Hydrologic Unit Code | 02050306 |
| Basin Name | Lower Susquehanna |
| Drainage Area (mi2) | 27,100 |
| Datum (feet above NGVD) | 5.00 |
| Period of Project Data Collection | January 1985 - Present |
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U.S. Department of Interior,
U.S. Geological Survey
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Last modified: 09/20/01 10:03:14 AM