USGS WRD banner

Concentrations and annual fluxes for selected water-quality constituents from the USGS National Stream Quality Accounting Network (NASQAN), 1996-2000

By Valerie J. Kelly, Richard P. Hooper, Brent T. Aulenbach, and Mary Janet

Bubble Diagrams of Average Concentrations

Download instructions || Major ions and nutrients || Trace elements || Pesticides || Sediment chemistry

Flow-weighted average concentrations based on mean loads for water years 1997-2000, unless otherwise indicated, can be accessed from the following list. The shorter period of record was used to provide a consistent period of record because sampling did not begin in 1996 for all stations. Sampling for one station did not begin until 1998, as noted on the diagrams and in Table 1. Data tables containing the flow-weighted concentrations, organized according to constituent group, can be downloaded by clicking on the heading for the particular group.

Bubble plots for each constituent can be viewed and downloaded by clicking on the constituent name. Where data were not available because the constituent was not sampled at a particular station, the station is marked with a filled-in triangle; where loads were not available because too few values were uncensured, the station is marked with an open triangle (no bubble).

Major ions and nutrients

Trace elements

Pesticides

Suspended sediment chemistry

Return to Results