Water resources data collected in the Pacific Northwest during the 1972 water year include chemical and physical characteristics of surface water. Data included in this report were collected by the Water Resources Division of the U.S. Geological Survey under the direction of the following district chiefs: H.K. Hall, Idaho; George M. Pike, Montana; S.F. Kapustka, Oregon; and L.B. Laird, Washington.
The Geological Survey has published records of chemical quality, water temperatures, and sediment since 1941 in an annual series of water-supply papers entitled "Quality of Surface Waters of the United States." Beginning with the 1964 water year, water-quality records have been published by the Geological Survey in annual reports on a State-boundary basis. These reports are available from the district offices.
This report is for limited distribution and is intended primarily for rapid release of selected data shortly after the end of the water year. Data contained herein is provisional and subject to revision before final publication in the foregoing reports. The following pages contain listings of selected constituents and their values sampled at 34 selected sites in the'Pacific Northwest. The sites are listed in downstream order by states. The constituent values recorded in the tables are the results of laboratory determinations except for water temperature, Ph, Dissolved Oxygen, Specific Conductance, Alkalinity, and Immediate Coliform count, which are the results of field determinations.
These data were collected and analyzed by the Geological Survey under cooperative programs with Environmental Protection Agency and other Federal, State, County, and municipal organizations as identified in the annual State-wide reports. Additional water-quality data may be obtained from district offices of the Geological Survey and from Environmental Protection Agency.
