Release notes
Updates to this application are expected every two years to coincide with the release of the latest short-term nontidal network data. Visit the Chesapeake Bay Water-Quality Loads and Trends web page for additional information or to access the data used in the application.
-
August 2022 - updated to share 2011-2020 water year results
-
July 2020 - initial release, 2009-2018 water year results
About this tool
The Nontidal Network Mapper geonarrative shares the short-term nutrient and suspended-sediment load and trend results for the Chesapeake Bay Program’s nontidal network (Figure 1).
Data collected from the 123 nontidal network stations are analyzed by the U.S. Geological Survey every two years and are 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.
The mapper provides the primary findings for nitrogen, phosphorus, and sediment trends and gives the user tools to further examine the results for river basins and individual sites.
Tool features
For each constituent (total nitrogen, total phosphorus, and suspended sediment), interactive maps, graphs, and query tools allow users to view both site-specific load, trend, and yield information as well as patterns across the Chesapeake Bay and its seven major watersheds.
For more information:
For more information on the nontidal network: Chesapeake Bay Water-Quality Loads and Trends
Related Content
Updated 2020 Nutrient and Suspended-Sediment Trends for the Nine Major Rivers Entering the Chesapeake Bay
USGS develops tool to further examine nutrient and sediment trends in the Chesapeake Bay Watershed
Chesapeake Bay Water-Quality Loads and Trends
River Input Monitoring
Related Content
- Science
Updated 2020 Nutrient and Suspended-Sediment Trends for the Nine Major Rivers Entering the Chesapeake Bay
Issue: The amount of nutrients and suspended sediment entering the Chesapeake Bay affect water-quality conditions in tidal waters. Excess nutrients contribute to algal blooms that lower the oxygen levels in tidal waters that are important for fish and shellfish. The algal blooms, along with suspended sediment, also decrease visibility in shallow waters for submerged aquatic grasses. The grasses...USGS develops tool to further examine nutrient and sediment trends in the Chesapeake Bay Watershed
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...Chesapeake Bay Water-Quality Loads and Trends
Explore resources here describing water-quality load and trend results for nontidal rivers of the Chesapeake Bay watershed. The health of the Chesapeake Bay is largely driven by changes in streamflow and the amount of pollution it contains. Runoff in the Chesapeake Bay watershed carries pollutants, such as nutrients and sediments, to rivers and streams that drain to the Bay. Scientists use...River Input Monitoring
The objective of this study is to provide concentrations and estimates of loads and trends of suspended solids, nitrogen, phosphorus, and other selected constituents at the James, Rappahannock, Appomattox, Pamunkey, and Mattaponi Rivers. - Data
- Publications
- Partners