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Home Water Data April 2018 Water Conditions Summary Estimated Streamflow to the Chesapeake Bay

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Estimated Streamflow to the Chesapeake Bay

The estimated monthly mean streamflow entering Chesapeake Bay during April 2018 was 72,700 ft3/s. This value, which is provisional and subject to revision, is considered to be in the normal range. Normal January streamflow entering the Bay is between 57,200 and 118,000 ft3/s, the 25th and 75th percentiles, respectively, of all January values. Average (mean) monthly streamflow for January is 91,200 ft3/s. These statistics are based on an 81-year period of record.

Runoff in the Chesapeake Bay watershed carries pollutants, such as nutrients and sediment, to rivers and streams that drain to the Bay. The amount of water flowing into the Chesapeake Bay from its tributaries has a direct impact on how much pollution is in the estuary, and it also affects the salinity levels that are important for the survival of fish, crabs, and oysters, with regard to the location and size of breeding/reproductive zones. Generally, as river flow increases, more nutrient and sediment pollution enters the Bay.

For more information about USGS Chesapeake Bay activities, please visit:

Data and more information on the freshwater streamflow to the Chesapeake Bay can be found here: “Estimated Streamflow Entering Chesapeake Bay

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Page Last Modified: Friday, October 24, 2014