Publications
All of our publications are accessible through the USGS Publication Warehouse. Publications by scientists of the Oregon Water Science Center are listed below.
Filter Total Items: 755
Subsurface transport of orthophosphate in five agricultural watersheds, USA
Concentrations of dissolved orthophosphate (ortho P) in the unsaturated zone, groundwater, tile drains, and groundwater/stream water interfaces were assessed in five agricultural watersheds to determine the potential for subsurface transport. Concentrations of iron oxides were measured in the aquifer material and adsorption of ortho P on oxide surfaces was assessed by geochemical modeling. Attenua
Authors
Joseph L. Domagalski, Henry M. Johnson
Surface-water nutrient conditions and sources in the United States Pacific Northwest
The SPAtially Referenced Regressions On Watershed attributes (SPARROW) model was used to perform an assessment of surface-water nutrient conditions and to identify important nutrient sources in watersheds of the Pacific Northwest region of the United States (U.S.) for the year 2002. Our models included variables representing nutrient sources as well as landscape characteristics that affect nutrien
Authors
D.R. Wise, H.M. Johnson
Trends in pesticide concentrations in streams of the western United States, 1993-2005
Trends in pesticide concentrations for 15 streams in California, Oregon, Washington, and Idaho were determined for the organophosphate insecticides chlorpyrifos and diazinon and the herbicides atrazine, s‐ethyl diproplythiocarbamate (EPTC), metolachlor, simazine, and trifluralin. A parametric regression model was used to account for flow, seasonality, and antecedent hydrologic conditions and there
Authors
Henry M. Johnson, Joseph L. Domagalski, Dina Saleh
Empirical models of wind conditions on Upper Klamath Lake, Oregon
Upper Klamath Lake is a large (230 square kilometers), shallow (mean depth 2.8 meters at full pool) lake in southern Oregon. Lake circulation patterns are driven largely by wind, and the resulting currents affect the water quality and ecology of the lake. To support hydrodynamic modeling of the lake and statistical investigations of the relation between wind and lake water-quality measurements, th
Authors
Norman L. Buccola, Tamara M. Wood
Thermal effects of dams in the Willamette River basin, Oregon
Methods were developed to assess the effects of dams on streamflow and water temperature in the Willamette River and its major tributaries. These methods were used to estimate the flows and temperatures that would occur at 14 dam sites in the absence of upstream dams, and river models were applied to simulate downstream flows and temperatures under a no-dams scenario. The dams selected for this st
Authors
Stewart A. Rounds
Use of stable isotopes of carbon and nitrogen to identify sources of organic matter to bed sediments of the Tualatin River, Oregon
The potential sources of organic matter to bed sediment of the Tualatin River in northwestern Oregon were investigated by comparing the isotopic fractionation of carbon and nitrogen and the carbon/nitrogen ratios of potential sources and bed sediments. Samples of bed sediment, suspended sediment, and seston, as well as potential source materials, such as soil, plant litter, duckweed, and wastewate
Authors
Bernadine A. Bonn, Stewart A. Rounds
Analyzing turbidity, suspended-sediment concentration, and particle-size distribution resulting from a debris flow on Mount Jefferson, Oregon, November 2006
A debris flow and sediment torrent occurred on the flanks of Mt Jefferson in Oregon on November 6, 2006, inundating 150 acres of forest. The massive debris flow was triggered by a rock and snow avalanche from the Milk Creek glaciers and snowfields during the early onset of an intense storm originating near the Hawaiian Islands. The debris flow consisted of a heavy conglomerate of large boulders, c
Authors
Mark A. Uhrich
Use of Continuous Monitors and Autosamplers to Predict Unmeasured Water-Quality Constituents in Tributaries of the Tualatin River, Oregon
Management of water quality in streams of the United States is becoming increasingly complex as regulators seek to control aquatic pollution and ecological problems through Total Maximum Daily Load programs that target reductions in the concentrations of certain constituents. Sediment, nutrients, and bacteria, for example, are constituents that regulators target for reduction nationally and in the
Authors
Chauncey W. Anderson, Stewart A. Rounds
Hydrology of Johnson Creek Basin, a Mixed-Use Drainage Basin in the Portland, Oregon, Metropolitan Area
Johnson Creek forms a wildlife and recreational corridor through densely populated areas of the Portland, Oregon, metropolitan area and through rural and agricultural land in unincorporated Multnomah and Clackamas Counties. Johnson Creek has had a history of persistent flooding and water-quality problems. The U.S. Geological Survey (USGS) has conducted streamflow monitoring and other hydrologic st
Authors
John S. Williams, Karl K. Lee, Daniel T. Snyder
Channel change and bed-material transport in the Lower Chetco River, Oregon
The lower Chetco River is a wandering gravel-bed river flanked by abundant and large gravel bars formed of coarse bed-material sediment. Since the early twentieth century, the large gravel bars have been a source of commercial aggregate for which ongoing permitting and aquatic habitat concerns have motivated this assessment of historical channel change and sediment transport rates. Analysis of his
Authors
J. Rose Wallick, Scott W. Anderson, Charles Cannon, Jim E. O'Connor
Water-Quality Data from Upper Klamath and Agency Lakes, Oregon, 2007-08
Significant Findings
The U.S. Geological Survey Upper Klamath Lake water-quality monitoring program collected data from multiparameter continuous water-quality monitors, weekly water-quality samples, and meteorological stations during May-November 2007 and 2008. The results of these measurements and sample analyses are presented in this report for 29 stations on Upper Klamath Lake and 2 station
Authors
Kristofor E. Kannarr, Dwight Q. Tanner, Mary K. Lindenberg, Tamara M. Wood
Suspended-Sediment Budget for the North Santiam River Basin, Oregon, Water Years 2005-08
Significant Findings
An analysis of sediment transport in the North Santiam River basin during water years 2005-08 indicated that:
Two-thirds of sediment input to Detroit Lake originated in the upper North Santiam River subbasin.
Two-thirds of the sediment transported past Geren Island originated in the Little North Santiam River subbasin.
The highest annual suspended-sediment load at any
Authors
Heather M. Bragg, Mark A. Uhrich