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J.W.Marriott Library CONTENTdm Server Repository
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Water quality samples were collected at sites in 16 randomly selected agricultural and 4 urban subbasins as part of Phase III of the Willamette River Basin Water Quality Study in Oregon during 1996. Ninety-five samples were collected and analyzed...
1997-05-21
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In September 1996, a water-quality study was done by the U.S. Geological Survey, in coordination with the U.S. Forest Service, in headwater streams of Steamboat Creek, a tributary to the North Umpqua River Basin in southwestern Oregon. Field...
1998-05-21
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Surface-water-quality conditions were assessed in the Yakima River Basin, which drains 6,155 square miles of mostly forested, range, and agricultural land in Washington. The Yakima River Basin is one of the most intensively farmed and irrigated...
1998-05-21
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Arsenic concentrations exceeding the U.S. Environmental Protection Agency (USEPA) current Maximum Contaminant Level (MCL) of 50 mg/L (micrograms per liter) are widespread in ground water in the Willamette Basin. The Oregon Water Resources...
1999-05-21
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This report presents ground-water data collected and compiled as part of a study of the ground-water resources of the Willamette River Basin, Oregon. The report includes tabulated information and a location map for 1,234 fieldlocated water wells...
2024-05-21
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This report presents ground-water data collected and compiled as part of a study of the ground-water resources of the Willamette River Basin, Oregon. The report includes tabulated information and a location map for 1,234 fieldlocated water wells...
1999-05-21
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A variety of elements and organic compounds have entered the environment as a result of human activities. Such substances find their way to aquatic sediments from direct discharges to waterways, atmospheric emissions, and runoff. Some of these...
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This report is intended to summarize major findings that emerged between 1991 and 1995 from the water quality assessment of the Willamette Basin Study Unit and to relate these findings to water quality issues of regional and national concern. The...
1998-05-21
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Ten sites on small South Umpqua River tributaries were sampled for inorganic constituents in water and streambed sediment. In aqueous samples, high concentrations (concentrations exceeding U.S. Environmental Protection Agency criterion continuous...
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Floods are the most chronic and costly natural hazard in the United States, causing an average of 140 fatalities and $5 billion damage each year (Schildgen, 1999). Despite advances in flood science and implementation of Federal hazard-reduction...
2024-05-21
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The lower Columbia River Basin includes the river basins draining into the Columbia River below Bonneville Dam—the largest of which is the Willamette River. This report presents the results of a study by the U.S. Geological Survey, done in...
1996-05-21
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To support the development of a total maximum daily load (TMDL) for water temperature in the Willamette Basin, the laterally averaged, two-dimensional model CE-QUAL-W2 was used to construct a water temperature and streamflow model of the Santiam...
2024-05-21
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Precipitation-runoff models, base-flowseparation techniques, and stream gain-loss measurements were used to study recharge and ground-water surface-water interaction as part of a study of the ground-water resources of the Willamette River Basin....
2024-05-21
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Fertilization of forests with urea-nitrogen has been studied numerous times for its effects on water quality. Stream nitrogen concentrations following fertilization are typically elevated during winter, including peaks in the tens-of-thousands of...
2024-05-21
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The U.S. Army Corps of Engineers (USACE) operates dams in the Columbia River Basin, which encompasses 259,000 square miles of the Pacific Northwest. These dams are multipurpose facilities that fill regional needs for flood control, navigation,...
2024-05-21
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Artificial neural network models were developed to estimate water temperatures in small streams using data collected at 148 sites throughout western Oregon from June to September 1999. The sites were located on 1st-, 2nd-, or 3rd-order streams...
2024-05-21
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The occurrence, distribution, and transport of dissolved (filtered-water) trace elements in the surface waters of the Yakima River Basin were assessed using data collected between 1999 and 2000 as part of the U.S. Geological Survey’s National...
2024-05-21
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Three real-time, instream water-quality and turbidity-monitoring sites were established in October 1998 in the upper North Santiam River Basin on the North Santiam River, the Breitenbush River, and Blowout Creek, the main tributary inputs to...
2024-05-21
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Previous studies by the U.S. Geological Survey (USGS) have established that many different herbicides can be found in small Willamette Valley streams. Several of the compounds detected in those studies were known to be used by the Oregon...
2024-05-21
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The occurrence, distribution, and transport of pesticides in surface water of the Yakima River Basin were assessed using data collected during 1999–2000 as part of the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program....
2024-05-21
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The calibration of a model of flow, temperature, and water quality in the Tualatin River, Oregon, originally calibrated for the summers of 1991 through 1993, was extended to the summers of 1991 through 1997. The model is now calibrated for a total...
2024-05-21
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Three sediment oxygen demand (SOD) measurement chambers were deployed in the Tualatin River near Tigard, Oregon, at river mile 10 in August 2000. SOD rates were calculated for three different circulation velocities during each chamber deployment....
2024-05-21
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Water-quality problems in the Tualatin River Basin, Oregon, include low dissolved oxygen (DO), high pH, high water temperature, and high bacterial (Escherichia coli, or E. coli) counts, all of which episodically exceed State of Oregon...
2024-05-21
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Ground water is increasingly relied upon to satisfy the needs of a growing population in the upper Deschutes Basin, Oregon. Hydrogeologic studies are being undertaken to aid in management of the ground-water resource. An understanding of the...
2024-05-21
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In 2000–01, the U.S. Geological Survey sampled the Clackamas River and its major lower-basin tributaries for 86 dissolved pesticides and selected breakdown products during storm runoff conditions. In all, 27 compounds, including 18 herbicides, 7...
2024-05-21
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