Long-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 1985-2013

Long-Term Trend in Flow-Adjusted Total Nitrogen Concentration, 1985-2013

Author: USGS

Date created: Jan 07, 2015

Fifty-five percent of monitoring sites in the Chesapeake Bay watershed show improving long-term flow-adjusted trends in nitrogen concentrations. Between 1985 and 2013: five out of nine sites—including the James, Patuxent, Potomac, Rappahannock and Susquehanna rivers—have shown improving trends for nitrogen concentrations. Two sites—including the Choptank and Pamunkey rivers—have shown degrading trends. Two sites—including the Appomattox and Mattaponi rivers—have shown minor changes that are not statistically significant.

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nitrogen monitoring