Nontidal network mapper

The Nontidal Network Mapper is an interactive web page that provides the primary findings for nitrogen, phosphorus and suspended-sediment trends and 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 also be accessed from the tool.

Data collected from the 123 NTN stations are analyzed by the U.S. Geological Survey 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 Chesapeake Bay Program partnership to help assess response in nontidal rivers and streams to nutrient and sediment reduction efforts.