USGS develops tool to further examine nutrient and sediment trends in the Chesapeake Bay Watershed

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The U.S. Geological Survey (USGS) has developed the nontidal network mapper to share the short-term (2009-2018) water-year nutrient and suspended-sediment load and trend results for the Chesapeake Bay Program’s (CBP) non-tidal network (NTN). The network is a cooperative effort by USGS, the U.S. Environmental Protection Agency (USEPA), and agencies in the states of the Chesapeake watershed and the District of Columbia.

The mapper (available through provides the primary findings for nitrogen, phosphorus and suspended-sediment trends, and gives the user tools to further examine the results for river basins and individual sites. Data used in the mapper, and the methods used to compute trends and loads, can be also accessed from the tool.

Data collected from the 123 NTN stations are analyzed by the USGS every two years and used to quantify the changes in nutrient (primarily nitrogen and phosphorus) and suspended-sediment loads. The results are used by the CBP partnership to help assess response in nontidal rivers and streams to nutrient and sediment reduction efforts.

For more information contact Douglas Moyer (

Posted August 4, 2020


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