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Chesapeake Bay River Input Monitoring Network 1985-2024: Short- and long-term trends

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: September 10, 2026 at 09:19 PM | Dataset Last Updated: July 10, 2025 at 12:00 AM
Nitrogen, phosphorus, and suspended-sediment loads, and changes in loads, in major rivers across the Chesapeake Bay watershed were calculated using monitoring data from the Chesapeake Bay River Input Monitoring (RIM) Network stations for the period 1985 through 2024. Nutrient and suspended-sediment loads and changes in loads were determined by applying a weighted regression approach called WRTDS (Weighted Regression on Time, Discharge, and Season). Flow-normalization reduces the influence of year-to-year streamflow variability on measured loads and aids in detection of trends. The trend in load is derived from the flow-normalized load timeseries and represents the change in load resulting from changes in sources, delays associated with storage or transport of historical inputs, and (or) implemented management actions. The file containing long- and short-term trends is provided in the "Attached Files" section.

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