Chesapeake Bay Nontidal Network: 1985-2023 Total Phosphorus Trends and Percent Change in Flow-Normalized Load

This map displays the long term trend for total phosphorus, as well as the percent total change in flow-normalized loads for total phosphorus across the Chesapeake Bay Watershed from 1985 to 2023. 

Learn more about Chesapeake Bay Water-Quality Loads and Trends and the USGS Nontidal Network.