Welcome to the USGS web site dedicated to providing water-quality trend and load results for the nontidal rivers of the Chesapeake Bay watershed.
The objectives of the Chesapeake Bay nontidal monitoring program are to:
- Quantify sediment and nutrient loads in the nontidal rivers of the Chesapeake Bay watershed.
- Estimate changes over time (trends) in sediment and nutrient concentrations that are related to the implementation of Best Management Practices, or other anthropogenic factors.
The monitoring data are collected by numerous agencies through the nontidal monitoring partnership. Results are updated each water year for the network of water quality monitoring stations distributed throughout the Chesapeake Bay watershed.
Methods, data, results, and interpretations are available for:
- Sediment and nutrient loads and yields
- Sediment and nutrient trends in concentration
- In-stream sediment and nutrient concentration data
- Stream discharge
Water Year 2013 load and trend results are only available for the following 9 major rivers with the longest water-quality records:
- Choptank River near Greensboro, Md, (01491000)
- Susquehanna River at Conowingo, Md. (01578310)
- Patuxent River near Bowie, Md. (01594440)
- Potomac River at Chain Bridge at Washington, D.C. (0164580)
- Rappahannock River near Fredericksburg, Va. (01668000)
- Pamunkey River near Hanover, Va. (01673000)
- Mattaponi River near Beulahville, Va. (01674500)
- James River at Cartersville, Va. (02035000)
- Appomattox River at Matoaca, Va. (02041650)
Load and trend results remain available for the rest of the monitoring network through the 2012 water year, and will be updated through the 2014 water year at a later date.
CLICK HERE for a summary of the 2013 trend results