Marc Stewart is the Deputy Director for Data at the USGS Oregon Water Science Center.
Science and Products
ORWSC Field Methods Training Workshop
Announcing the ORWSC's "Training for Advancement in Hydrologic Data Processing and Technical Field Skills" from Monday, April 30, 2018 to Thursday, May 3, 2018, at Camp Rilea, Oregon.
Thalweg determination for three rivers in the Pacific Northwest, USA, 2023
In May 2023, the U.S. Geological Survey provided training for bathymetric data acquisition and processing for the Iraq Ministry of Water Resources. The training included multibeam sonar theory, survey planning, data collection and processing, and dissemination. This data release presents the raw survey data, a digital elevation model (DEM), and a thalweg shapefile for three survey areas in the Pac
A call for strategic water-quality monitoring to advance assessment and prediction of wildfire impacts on water supplies
Wildfires pose a risk to water supplies in the western U.S. and many other parts of the world, due to the potential for degradation of water quality. However, a lack of adequate data hinders prediction and assessment of post-wildfire impacts and recovery. The dearth of such data is related to lack of funding for monitoring extreme events and the challenge of measuring the outsized hydrologic and e
Authors
Sheila F. Murphy, Charles N. Alpers, Chauncey W. Anderson, John R. Banta, Johanna Blake, Kurt D. Carpenter, Gregory D. Clark, David W. Clow, Laura A. Hempel, Deborah A. Martin, Michael Meador, Gregory Mendez, Anke Mueller-Solger, Marc A. Stewart, Sean E. Payne, Cara L. Peterman-Phipps, Brian A. Ebel
Historical streamflow and stage data compilation for the Lower Columbia River, Pacific Northwest
The U.S. Geological Survey mined data from a variety of national and state agencies including USGS, Oregon Water Resources Department, National Oceanic and Atmospheric Administration, Washington Department of Ecology, Pacific Northwest National Laboratory, Portland State University, and U.S. Army Corps of Engineers. A comprehensive dataset of streamflow, stage, and tidal elevations for the Lower C
Authors
Carrie L. Boudreau, Marc A. Stewart, Adam J. Stonewall
Nutrient loads in the Lost River and Klamath River Basins, south-central Oregon and northern California, March 2012–March 2015
The U.S. Geological Survey and Bureau of Reclamation collected water-quality data from March 2012 to March 2015 at locations in the Lost River and Klamath River Basins, Oregon, in an effort to characterize water quality and compute a nutrient budget for the Bureau of Reclamation Klamath Reclamation Project. The study described in this report resulted in the following significant findings:Total pho
Authors
Liam N. Schenk, Marc A. Stewart, Sara L. Caldwell Eldridge
Evaluating external nutrient and suspended-sediment loads to Upper Klamath Lake, Oregon, using surrogate regressions with real-time turbidity and acoustic backscatter data
Executive SummarySuspended-sediment and total phosphorus loads were computed for two sites in the Upper Klamath Basin on the Wood and Williamson Rivers, the two main tributaries to Upper Klamath Lake. High temporal resolution turbidity and acoustic backscatter data were used to develop surrogate regression models to compute instantaneous concentrations and loads on these rivers. Regression models
Authors
Liam N. Schenk, Chauncey W. Anderson, Paul Diaz, Marc A. Stewart
Modeling hydrodynamics, water temperature, and water quality in the Klamath River upstream of Keno Dam, Oregon, 2006-09
A hydrodynamic, water temperature, and water-quality model was constructed for a 20-mile reach of the Klamath River downstream of Upper Klamath Lake, from Link River to Keno Dam, for calendar years 2006-09. The two-dimensional, laterally averaged model CE-QUAL-W2 was used to simulate water velocity, ice cover, water temperature, specific conductance, dissolved and suspended solids, dissolved oxyge
Authors
Annett B. Sullivan, Stewart A. Rounds, Michael L. Deas, Jessica R. Asbill, Roy E. Wellman, Marc A. Stewart, Matthew W. Johnston, I. Ertugrul Sogutlugil
Surface-Water Exchange through Culverts beneath State Road 9336 within Everglades National Park, 2004-05
The U.S. Geological Survey collected hydrologic data between June 2004 and December 2005 to investigate the temporal and spatial nature of flow exchanges through culverts beneath State Road 9336 within Everglades National Park. Continuous data collected during the study measured flow velocity, water level, salinity, conductivity, and water-temperature in or near seven culverts between Pa-hay-okee
Authors
Raymond W. Schaffranek, Marc A. Stewart, Daniel J. Nowacki
Klamath River Water Quality and Acoustic Doppler Current Profiler Data from Link River Dam to Keno Dam, 2007
In 2007, the U.S. Geological Survey, Watercourse Engineering, and the Bureau of Reclamation began a project to construct and calibrate a water quality and hydrodynamic model of the 21-mile reach of the Klamath River from Link River Dam to Keno Dam. To provide a basis for this work, data collection and experimental work were planned for 2007 and 2008. This report documents sampling and analytical m
Authors
Annett B. Sullivan, Michael L. Deas, Jessica Asbill, Julie D. Kirshtein, Kenna D. Butler, Marc A. Stewart, Roy W. Wellman, Jennifer Vaughn
Water resources data for Oregon, water year 2005
No abstract available.
Authors
Thomas A. Herrett, Glen W. Hess, Marc A. Stewart, Gregory P. Ruppert, Mary-Lorraine Courts
Science and Products
- Science
ORWSC Field Methods Training Workshop
Announcing the ORWSC's "Training for Advancement in Hydrologic Data Processing and Technical Field Skills" from Monday, April 30, 2018 to Thursday, May 3, 2018, at Camp Rilea, Oregon. - Data
Thalweg determination for three rivers in the Pacific Northwest, USA, 2023
In May 2023, the U.S. Geological Survey provided training for bathymetric data acquisition and processing for the Iraq Ministry of Water Resources. The training included multibeam sonar theory, survey planning, data collection and processing, and dissemination. This data release presents the raw survey data, a digital elevation model (DEM), and a thalweg shapefile for three survey areas in the Pac - Publications
A call for strategic water-quality monitoring to advance assessment and prediction of wildfire impacts on water supplies
Wildfires pose a risk to water supplies in the western U.S. and many other parts of the world, due to the potential for degradation of water quality. However, a lack of adequate data hinders prediction and assessment of post-wildfire impacts and recovery. The dearth of such data is related to lack of funding for monitoring extreme events and the challenge of measuring the outsized hydrologic and eAuthorsSheila F. Murphy, Charles N. Alpers, Chauncey W. Anderson, John R. Banta, Johanna Blake, Kurt D. Carpenter, Gregory D. Clark, David W. Clow, Laura A. Hempel, Deborah A. Martin, Michael Meador, Gregory Mendez, Anke Mueller-Solger, Marc A. Stewart, Sean E. Payne, Cara L. Peterman-Phipps, Brian A. EbelHistorical streamflow and stage data compilation for the Lower Columbia River, Pacific Northwest
The U.S. Geological Survey mined data from a variety of national and state agencies including USGS, Oregon Water Resources Department, National Oceanic and Atmospheric Administration, Washington Department of Ecology, Pacific Northwest National Laboratory, Portland State University, and U.S. Army Corps of Engineers. A comprehensive dataset of streamflow, stage, and tidal elevations for the Lower CAuthorsCarrie L. Boudreau, Marc A. Stewart, Adam J. StonewallNutrient loads in the Lost River and Klamath River Basins, south-central Oregon and northern California, March 2012–March 2015
The U.S. Geological Survey and Bureau of Reclamation collected water-quality data from March 2012 to March 2015 at locations in the Lost River and Klamath River Basins, Oregon, in an effort to characterize water quality and compute a nutrient budget for the Bureau of Reclamation Klamath Reclamation Project. The study described in this report resulted in the following significant findings:Total phoAuthorsLiam N. Schenk, Marc A. Stewart, Sara L. Caldwell EldridgeEvaluating external nutrient and suspended-sediment loads to Upper Klamath Lake, Oregon, using surrogate regressions with real-time turbidity and acoustic backscatter data
Executive SummarySuspended-sediment and total phosphorus loads were computed for two sites in the Upper Klamath Basin on the Wood and Williamson Rivers, the two main tributaries to Upper Klamath Lake. High temporal resolution turbidity and acoustic backscatter data were used to develop surrogate regression models to compute instantaneous concentrations and loads on these rivers. Regression modelsAuthorsLiam N. Schenk, Chauncey W. Anderson, Paul Diaz, Marc A. StewartModeling hydrodynamics, water temperature, and water quality in the Klamath River upstream of Keno Dam, Oregon, 2006-09
A hydrodynamic, water temperature, and water-quality model was constructed for a 20-mile reach of the Klamath River downstream of Upper Klamath Lake, from Link River to Keno Dam, for calendar years 2006-09. The two-dimensional, laterally averaged model CE-QUAL-W2 was used to simulate water velocity, ice cover, water temperature, specific conductance, dissolved and suspended solids, dissolved oxygeAuthorsAnnett B. Sullivan, Stewart A. Rounds, Michael L. Deas, Jessica R. Asbill, Roy E. Wellman, Marc A. Stewart, Matthew W. Johnston, I. Ertugrul SogutlugilSurface-Water Exchange through Culverts beneath State Road 9336 within Everglades National Park, 2004-05
The U.S. Geological Survey collected hydrologic data between June 2004 and December 2005 to investigate the temporal and spatial nature of flow exchanges through culverts beneath State Road 9336 within Everglades National Park. Continuous data collected during the study measured flow velocity, water level, salinity, conductivity, and water-temperature in or near seven culverts between Pa-hay-okeeAuthorsRaymond W. Schaffranek, Marc A. Stewart, Daniel J. NowackiKlamath River Water Quality and Acoustic Doppler Current Profiler Data from Link River Dam to Keno Dam, 2007
In 2007, the U.S. Geological Survey, Watercourse Engineering, and the Bureau of Reclamation began a project to construct and calibrate a water quality and hydrodynamic model of the 21-mile reach of the Klamath River from Link River Dam to Keno Dam. To provide a basis for this work, data collection and experimental work were planned for 2007 and 2008. This report documents sampling and analytical mAuthorsAnnett B. Sullivan, Michael L. Deas, Jessica Asbill, Julie D. Kirshtein, Kenna D. Butler, Marc A. Stewart, Roy W. Wellman, Jennifer VaughnWater resources data for Oregon, water year 2005
No abstract available.AuthorsThomas A. Herrett, Glen W. Hess, Marc A. Stewart, Gregory P. Ruppert, Mary-Lorraine Courts - News