Sprague, L., Harned, D., Hall, D., Nowell, L., Bauch, N., Richards, K. 2007. Response of Stream Chemistry during Base Flow to Gradients of Urbanization in Selected Locations across the Conterminous United States, 2002–04. USGS Scientific Investigations Report 2007–5083 .U.S. Geological Survey, Denver, CO.

baseflow, chemistry, impacts, urban, water quality

During 2002–2004, the U.S. Geological Survey’s National Water-Quality Assessment (NAWQA) Program conducted a study to determine the effects of urbanization on stream water quality and aquatic communities in six environmentally heterogeneous areas of the conterminous United States—Atlanta, Georgia; Raleigh-Durham, North Carolina; Milwaukee-Green Bay, Wisconsin; Dallas-Fort Worth, Texas; Denver, Colorado; and Portland, Oregon. Chemical constituents studied included concentrations of nutrients, dissolved pesticides, suspended sediment, sulfate, and chloride in base flow.