Stewart Rounds
Stewart Rounds is a Scientist Emeritus at the USGS Oregon Water Science Center.
Dr. Rounds joined the U.S. Geological Survey in 1992 and worked on a wide variety of studies, with a focus on water-quality monitoring and modeling of rivers and lakes around Oregon. In 2020, Stewart retired and continues to volunteer with USGS as a Scientist Emeritus.
Dr. Rounds' research interests focus on the water-quality modeling of river and lake systems, with particular emphasis on temperature, nutrients, dissolved oxygen, and algae. Ongoing studies focus on producing a better understanding of heat fluxes and heat transport in the Willamette and Kootenai River systems. Most of his work focuses on developing a better understanding of the characteristics and water-quality dynamics of a system so that it can be more effectively managed. He is also the author of the Alkalinity Calculator, a tool that analyzes alkalinity titrations, and the Data Grapher, a set of tools to make custom graphs and tables from USGS continuous water-quality monitoring data.
Education and Certifications
B.S. -- Chemistry, 1985 - University of Illinois at Urbana-Champaign
Ph.D. -- Environmental Science & Engineering, 1992 - Oregon Graduate Institute of Science & Technology
Science and Products
Harmful Algal Blooms and Drinking Water in Oregon
Willamette River Studies
Water Temperature Modeling in the Middle Fork Willamette and South Santiam River Basins
Henry Hagg Lake Water-Quality Model
Tualatin River Basin Water Quality Assessment
A Thermal Mosaic for the Willamette River
Detroit Lake Temperature and Suspended Sediment Model
Comparisons of dissolved-oxygen calibration methods at various elevations, Oregon, 2023
CE-QUAL-W2 models for select U.S. Army Corps of Engineers reservoirs in the Willamette Valley Project and an inter-reservoir reach of the Middle Fork Willamette River, northwestern Oregon, 2011, 2015, and 2016
CE-QUAL-W2 models for the Willamette River and major tributaries downstream of U.S. Army Corps of Engineers dams: 2011, 2015, and 2016 (version 1.1, December 2023)
Updates to CE-QUAL-W2 models for select U.S. Army Corps of Engineers reservoirs in the Willamette Valley Project and an inter-reservoir reach of the Middle Fork Willamette River, northwestern Oregon
Field techniques for fluorescence measurements targeting dissolved organic matter, hydrocarbons, and wastewater in environmental waters: Principles and guidelines for instrument selection, operation and maintenance, quality assurance, and data reporting
Field techniques for the determination of algal pigment fluorescence in environmental waters—Principles and guidelines for instrument and sensor selection, operation, quality assurance, and data reporting
The use of algal fluorometers by the U.S. Geological Survey (USGS) has become increasingly common. The basic principles of algal fluorescence, instrument calibration, interferences, data quantification, data interpretation, and quality control are given in Hambrook Berkman and Canova (2007). Much of the guidance given for instrument maintenance, data storage, and quality assurance in Wagner and ot
Tracking heat in the Willamette River system, Oregon
The thermal landscape of the Willamette River—Patterns and controls on stream temperature and implications for flow management and cold-water salmonids
Updates to models of streamflow and water temperature for 2011, 2015, and 2016 in rivers of the Willamette River Basin, Oregon
Estimating stream temperature in the Willamette River Basin, northwestern Oregon—A regression-based approach
Integrated tools for identifying optimal flow regimes and evaluating alternative minimum flows for recovering at-risk salmonids in a highly managed system
Modeling water temperature response to dam operations and water management in Green Peter and Foster Lakes and the South Santiam River, Oregon
Temperature and water-quality diversity and the effects of surface-water connection in off-channel features of the Willamette River, Oregon, 2015–16
Effects of harmful algal blooms and associated water-quality on endangered Lost River and shortnose suckers
Evaluation of restoration alternatives using hydraulic models of lake outflow at Wapato Lake National Wildlife Refuge, northwestern Oregon
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
USGS Data Grapher
This is a data graphing utility that allows the user to build graphs of data from selected USGS stations. Select the station, the type of graph, the parameter(s) to plot, and the starting and ending dates for the graph.
Alkalinity Calculator
The Alkalinity Calculator will analyze the titration curve and calculate the alkalinity or acid neutralizing capacity (ANC) of the sample using one or more of several different methods. Alkalinity is for filtered samples, while ANC is for unfiltered samples. The results will be displayed in tabular and graphical form.
Science and Products
Harmful Algal Blooms and Drinking Water in Oregon
Willamette River Studies
Water Temperature Modeling in the Middle Fork Willamette and South Santiam River Basins
Henry Hagg Lake Water-Quality Model
Tualatin River Basin Water Quality Assessment
A Thermal Mosaic for the Willamette River
Detroit Lake Temperature and Suspended Sediment Model
Comparisons of dissolved-oxygen calibration methods at various elevations, Oregon, 2023
CE-QUAL-W2 models for select U.S. Army Corps of Engineers reservoirs in the Willamette Valley Project and an inter-reservoir reach of the Middle Fork Willamette River, northwestern Oregon, 2011, 2015, and 2016
CE-QUAL-W2 models for the Willamette River and major tributaries downstream of U.S. Army Corps of Engineers dams: 2011, 2015, and 2016 (version 1.1, December 2023)
Updates to CE-QUAL-W2 models for select U.S. Army Corps of Engineers reservoirs in the Willamette Valley Project and an inter-reservoir reach of the Middle Fork Willamette River, northwestern Oregon
Field techniques for fluorescence measurements targeting dissolved organic matter, hydrocarbons, and wastewater in environmental waters: Principles and guidelines for instrument selection, operation and maintenance, quality assurance, and data reporting
Field techniques for the determination of algal pigment fluorescence in environmental waters—Principles and guidelines for instrument and sensor selection, operation, quality assurance, and data reporting
The use of algal fluorometers by the U.S. Geological Survey (USGS) has become increasingly common. The basic principles of algal fluorescence, instrument calibration, interferences, data quantification, data interpretation, and quality control are given in Hambrook Berkman and Canova (2007). Much of the guidance given for instrument maintenance, data storage, and quality assurance in Wagner and ot
Tracking heat in the Willamette River system, Oregon
The thermal landscape of the Willamette River—Patterns and controls on stream temperature and implications for flow management and cold-water salmonids
Updates to models of streamflow and water temperature for 2011, 2015, and 2016 in rivers of the Willamette River Basin, Oregon
Estimating stream temperature in the Willamette River Basin, northwestern Oregon—A regression-based approach
Integrated tools for identifying optimal flow regimes and evaluating alternative minimum flows for recovering at-risk salmonids in a highly managed system
Modeling water temperature response to dam operations and water management in Green Peter and Foster Lakes and the South Santiam River, Oregon
Temperature and water-quality diversity and the effects of surface-water connection in off-channel features of the Willamette River, Oregon, 2015–16
Effects of harmful algal blooms and associated water-quality on endangered Lost River and shortnose suckers
Evaluation of restoration alternatives using hydraulic models of lake outflow at Wapato Lake National Wildlife Refuge, northwestern Oregon
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
USGS Data Grapher
This is a data graphing utility that allows the user to build graphs of data from selected USGS stations. Select the station, the type of graph, the parameter(s) to plot, and the starting and ending dates for the graph.
Alkalinity Calculator
The Alkalinity Calculator will analyze the titration curve and calculate the alkalinity or acid neutralizing capacity (ANC) of the sample using one or more of several different methods. Alkalinity is for filtered samples, while ANC is for unfiltered samples. The results will be displayed in tabular and graphical form.