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  1. 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...

  2. 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...

  3. Inorganic chemistry of water and bed sediment in selected tributaries of the South Umpqua River, Oregon, 1998

    This report presents results of an investigation of water and streambed-sediment quality in selected tributaries of the South Umpqua River. Concentrations of inorganic constituents in water (major and minor...

  4. 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...

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