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  1. Major-ion, nutrient, and trace-element concentrations in the Steamboat Creek Basin, Oregon, 1996

    This report presents the concentrations of major ions, nutrients, and trace elements in water and bottom sediments collected in the four-tributaries during the low-flow condition of September 9-13, 1996....

  2. Selected elements and organic chemicals in bed sediment and fish tissue of the Tualatin River Basin, Oregon, 1992-96

    The U.S. Geological Survey (USGS) has worked cooperative with the Unified Sewerage Agency of Washington County (USA) since 1990 to assess water quality in the Tualatin River Basin. The objectives of this study...

  3. Summary of information on aquatic biota and their habitats in the Willamette Basin, Oregon, through 1995

    This report reviews and summarizes available information on aquatic biological communities in the Willamette Basin through 1995. Specifically, the report describes (1) the distribution, abndance, and trends of...

  4. Microbiological quality of the Yaquina Estuary

    The activities on which this report is based were financed in part by the Department of the Interior, U.S. Geological Survey, through the Oregon Water Resources Research Institute.

  5. Quality of shallow ground water in alluvial aquifers of the Willamette Basin, Oregon, 1993-95

    The purposes of this report are to describe the quality of shallow ground water in alluvial aquifers of the Willamette Basin and to identify relationships between shallow ground-water quality and various...

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