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Daniel R Wise

Dan is a hydrologist with the U.S. Geological Survey at the Oregon Water Science Center in Portland, Oregon.

Dan has been with the USGS Oregon Water Science Center since 2001. His work is focused primarily on the interpretation of regional water quality data, such as relating surface-water nutrient and sediment conditions to landscape characteristics. He also works on the Integrated Water Availability Assessment for the Upper Colorado River Basin. 

 

 

Education and Certifications

  • Drexel University, B.S. in Civil and Environmental Engineering, 1990

  • University of Rhode Island, M.S. in Civil and Environmental Engineering, 1993

  • Oregon State University, M.S. in Geography, 2001

Science and Products

Mountains and pine trees covered with a thick layer of snow.

Regional Water Availability Assessment: Upper Colorado River Basin

Regional Water Availability Assessments are scientific assessments of water availability in different hydrologic regions across the Nation. In the Upper Colorado River Basin, the USGS will conduct a focused assessment of how snowpack and snowmelt influence hydrology and water quality, and an integrated and comprehensive assessment of multiple water quantity, quality and use factors.
By
Water Resources Mission Area, Integrated Water Availability Assessments
Regional Water Availability Assessment: Upper Colorado River Basin

Regional Water Availability Assessment: Upper Colorado River Basin

Regional Water Availability Assessments are scientific assessments of water availability in different hydrologic regions across the Nation. In the Upper Colorado River Basin, the USGS will conduct a focused assessment of how snowpack and snowmelt influence hydrology and water quality, and an integrated and comprehensive assessment of multiple water quantity, quality and use factors.
Learn More
Illustration showing an oblique view of the Puget Sound watershed.

SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

SPARROW can be used to relate water-quality data to landscape characteristics, such as natural properties and human activities
By
Oregon Water Science Center
SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

SPARROW can be used to relate water-quality data to landscape characteristics, such as natural properties and human activities
Learn More
Filter Total Items: 29

Input and output data used to assess the effects of climate on the temporal variability in streamflow and total dissolved solids loads in the Upper Colorado River Basin, water years 1986-2021 Input and output data used to assess the effects of climate on the temporal variability in streamflow and total dissolved solids loads in the Upper Colorado River Basin, water years 1986-2021

This data release contains the input and output used to assess the potential effect of climate on streamflow and salinity (measured as total dissolved solids [TDS]) yields across the Upper Colorado River Basin from water years 1986 to 2021. This analysis included estimation of the spatiotemporal variability in mean annual climatic variables (air temperature, snow water equivalent...
By
Colorado Water Science Center

RSPARROW versions of previously developed SAS-based models of streamflow, suspended-sediment, total nitrogen, and total phosphorus conditions in the Midwest, Northeast, Pacific, Southeast, and Southwest Regions of the United States for water years 2000 - RSPARROW versions of previously developed SAS-based models of streamflow, suspended-sediment, total nitrogen, and total phosphorus conditions in the Midwest, Northeast, Pacific, Southeast, and Southwest Regions of the United States for water years 2000 -

The USGS Spatially Referenced Regression on Watershed attributes (SPARROW) model is a hybrid empirical/process-based mass balance model that can be used to estimate the major sources and environmental factors that affect the supply, transport, and fate of contaminants in streams and surface-water impoundments (Schwarz and others, 2006). This data release includes a set of 20 regional...
By
Oregon Water Science Center

Per- and polyfluoroalkyl substances (PFAS) and wastewater indicator compounds measured in polar organic chemical integrative samplers (POCIS), and cyanotoxin concentrations measured in solid phase adsorption toxin trackers (SPATTs), in the lower Columbia Per- and polyfluoroalkyl substances (PFAS) and wastewater indicator compounds measured in polar organic chemical integrative samplers (POCIS), and cyanotoxin concentrations measured in solid phase adsorption toxin trackers (SPATTs), in the lower Columbia

This data release contains the analytical results of three contaminant classes in water using two types of passive sampling devices. Samples were collected at eight sites in the lower Columbia River and two sites in the lower Willamette River in Oregon and Washington. A Polar Organic Compound Integrating Sampler (POCIS) and a Solid-Phase Adsorption Toxin Tracker (SPATT) sampler were...
By
Oregon Water Science Center

Watershed landscape data used in the dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Puget Sound and the Strait of Juan de Fuca, Washington, 2005 – 2020 Watershed landscape data used in the dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Puget Sound and the Strait of Juan de Fuca, Washington, 2005 – 2020

This data release contains the watershed ancillary data that were used as input for a set of dynamic Spatially Referenced Regression On Watershed attributes (SPARROW) models for watersheds draining to Puget Sound and the Strait of Juan de Fuca, Washington for the years 2005 - 2020. The SPARROW models were used to estimate mean seasonal total nitrogen and total phosphorous conditions and...
By
Oregon Water Science Center

Model application and calibration load data for seasonally dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Washington waters of the Salish Sea, 2005 through 2020 Model application and calibration load data for seasonally dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Washington waters of the Salish Sea, 2005 through 2020

This data release contains two data sets: 1) the model application data for a set of dynamic total nitrogen (TN) and total phosphorus (TP) SPARROW (SPAtially Referenced Regression On Watershed attributes; Schwarz and others, 2006, https://doi.org/10.3133/tm6B3) load models that were developed for watersheds draining to Washington waters of the Salish Sea (Puget Sound region) 2005 through...
By
Oregon Water Science Center

Daily baseflow discharge and daily stream and baseflow total dissolved solids (TDS) loads for selected locations in the Upper Colorado River Basin for water years 1986 – 2020 Daily baseflow discharge and daily stream and baseflow total dissolved solids (TDS) loads for selected locations in the Upper Colorado River Basin for water years 1986 – 2020

This data release contains measured stream discharge and total dissolved solids (TDS) data and estimated values for daily stream TDS loads, daily baseflow discharge, and daily baseflow TDS loads for 205 locations in the Upper Colorado River Basin. The estimated values, which represent conditions between 10/1/1985 and 9/30/2020, were obtained using the Weighted Regressions on Time...
By
Utah Water Science Center
Filter Total Items: 24

Effects of climate on temporal variability in streamflow and salinity in the Upper Colorado River Basin Effects of climate on temporal variability in streamflow and salinity in the Upper Colorado River Basin

Study RegionThe Upper Colorado River Basin, a critical water source for more than 40 million people in the western United States.Study FocusPotential decreasing streamflow and elevated salinity concentrations threaten this resource. Climate variability has a large and well-studied effect on streamflow in the basin; however, the effect on salinity loading is less understood. This study...
Authors
Natalie K. Day, Patrick C. Longley, Daniel Wise, Morgan C. McDonnell
By
Colorado Water Science Center

Preprint: Simulated seasonal loads of total nitrogen and total phosphorus by major source from watersheds draining to Washington waters of the Salish Sea, 2005 through 2020 Preprint: Simulated seasonal loads of total nitrogen and total phosphorus by major source from watersheds draining to Washington waters of the Salish Sea, 2005 through 2020

The U.S. Geological Survey (USGS) and the Washington State Department of Ecology (Ecology) have developed watershed models of seasonal load estimates of total nitrogen (TN) and total phosphorus (TP) discharging into the Washington waters of the Salish Sea from 2005 through 2020. The modeling approach used was dynamic SPARROW (SPAtially Referenced Regressions On Watershed attributes), a...
Authors
Noah Schmadel, Cristiana Figueroa-Kaminsky, Daniel Wise, Jamie K. Wasielewski, Zachary Johnson, Robert W. Black
By
Ecosystems Mission Area, Water Resources Mission Area, Eastern Ecological Science Center, Washington Water Science Center

Salinity or sum of constituents— Methods comparison for computing dissolved solids concentrations in streams of the Upper Colorado River Basin Salinity or sum of constituents— Methods comparison for computing dissolved solids concentrations in streams of the Upper Colorado River Basin

The Colorado River is an important water source in the southwestern United States and northern Mexico. High concentrations of dissolved solids in the river, sourced mainly from the Upper Colorado River Basin (UCOL), cause hundreds of millions of dollars in damages annually to crops and infrastructure. Determinations of total dissolved solids (TDS) in river and tributary samples often...
Authors
Fred D. Tillman, Matthew P. Miller, Daniel Wise, R. Blaine McCleskey, Natalie K. Day
By
Water Resources Mission Area, Arizona Water Science Center

Database of surface water diversion sites and daily withdrawals for the upper Colorado River Basin, 1980–2022 Database of surface water diversion sites and daily withdrawals for the upper Colorado River Basin, 1980–2022

The Colorado River drains about 8% of the conterminous United States, provides water for 40 million people, and is one of the most overallocated rivers in the world. As the upper Colorado River Basin (UCOL) contributes an estimated 92% of the total basin natural streamflow, knowledge of the location and amount of surface water withdrawals in the UCOL is important for managing the...
Authors
Samuel Francisco Lopez, Jacob E. Knight, Fred D. Tillman, Melissa D. Masbruch, Daniel Wise, Casey J.R. Jones, Matthew P. Miller
By
Water Resources Mission Area, Utah Water Science Center

Assessing the effects of chloride deicer applications on groundwater near the Siskiyou Pass, southwestern Oregon, July 2018–February 2021 Assessing the effects of chloride deicer applications on groundwater near the Siskiyou Pass, southwestern Oregon, July 2018–February 2021

The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation (ODOT), evaluated the effects of cold-weather chloride deicers (road deicing chemicals) on groundwater quality, with a focus on chloride, near the Siskiyou Pass in southwestern Oregon. The study covered the period during July 2018 through February 2021. Between the years 2016 and 2020 ODOT applied up...
Authors
Stephen B. Gingerich, Daniel R. Wise, Adam J. Stonewall
By
Water Resources Mission Area, Oregon Water Science Center

Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type

The total concentration of dissolved constituents in water is routinely quantified by measurements of salinity or total dissolved solids (TDS). However, salinity and TDS are operationally defined by their analytical methods and are not equivalent for most waters. Furthermore, multiple methods are available to determine salinity and TDS, and these methods have inherent differences. TDS is...
Authors
R. Blaine McCleskey, Charles A. Cravotta, Matthew P. Miller, Fred D. Tillman, Paul E. Stackelberg, Katherine J. Knierim, Daniel Wise
By
Water Resources Mission Area, National Water Quality Program, Arizona Water Science Center, Lower Mississippi-Gulf Water Science Center, Oregon Water Science Center, Pennsylvania Water Science Center

Visualizations of water quality across the conterminous United States using SPARROW 2012 simulated nutrient load estimates Visualizations of water quality across the conterminous United States using SPARROW 2012 simulated nutrient load estimates

This pipeline uses the data from the 2012 regional Sparrow models (see **Input datasets** below) to produce four types of outputs: 1. Maps of SPARROW-estimated total nitrogen, total phosphorus, and total suspended-sediment yields and concentrations across the conterminous United States (CONUS); 2. Bar plots showing the amount of total nitrogen, total phosphorus, and suspended sediment...
By
Water Resources Mission Area, Integrated Water Availability Assessments

SPARROW modeling: Estimating contaminant transport SPARROW modeling: Estimating contaminant transport

SPARROW (SPAtially Referenced Regression On Watershed attributes) models estimate the amount of a contaminant transported from inland watersheds to larger water bodies by linking monitoring data with information on watershed characteristics and contaminant sources.
By
Oregon Water Science Center
New Publication - Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass, Southwestern Oregon

New Publication - Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass, Southwestern Oregon

The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation, evaluated the effects of cold-weather chloride deicers (road...

Read Article
USGS uses watershed modeling to assess surface-water nutrient impairment across the Pacific Northwest and California

USGS uses watershed modeling to assess surface-water nutrient impairment across the Pacific Northwest and California

The region-wide, reach-scale results from a new study provide two new tools that might help water-quality managers. One is an estimate of the total...

Read Article
Surface-water nutrient and sediment mappers are now available

Surface-water nutrient and sediment mappers are now available

SPARROW mappers are interactive tools that allow users to evaluate streamflow and nutrient and sediment conditions as well as the importance of...

Read Article

Science and Products

Mountains and pine trees covered with a thick layer of snow.

Regional Water Availability Assessment: Upper Colorado River Basin

Regional Water Availability Assessments are scientific assessments of water availability in different hydrologic regions across the Nation. In the Upper Colorado River Basin, the USGS will conduct a focused assessment of how snowpack and snowmelt influence hydrology and water quality, and an integrated and comprehensive assessment of multiple water quantity, quality and use factors.
By
Water Resources Mission Area, Integrated Water Availability Assessments
Regional Water Availability Assessment: Upper Colorado River Basin

Regional Water Availability Assessment: Upper Colorado River Basin

Regional Water Availability Assessments are scientific assessments of water availability in different hydrologic regions across the Nation. In the Upper Colorado River Basin, the USGS will conduct a focused assessment of how snowpack and snowmelt influence hydrology and water quality, and an integrated and comprehensive assessment of multiple water quantity, quality and use factors.
Learn More
Illustration showing an oblique view of the Puget Sound watershed.

SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

SPARROW can be used to relate water-quality data to landscape characteristics, such as natural properties and human activities
By
Oregon Water Science Center
SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

SPARROW Model Assessments of Nutrients and Suspended Sediment in the Pacific Northwest and California

SPARROW can be used to relate water-quality data to landscape characteristics, such as natural properties and human activities
Learn More
Filter Total Items: 29

Input and output data used to assess the effects of climate on the temporal variability in streamflow and total dissolved solids loads in the Upper Colorado River Basin, water years 1986-2021 Input and output data used to assess the effects of climate on the temporal variability in streamflow and total dissolved solids loads in the Upper Colorado River Basin, water years 1986-2021

This data release contains the input and output used to assess the potential effect of climate on streamflow and salinity (measured as total dissolved solids [TDS]) yields across the Upper Colorado River Basin from water years 1986 to 2021. This analysis included estimation of the spatiotemporal variability in mean annual climatic variables (air temperature, snow water equivalent...
By
Colorado Water Science Center

RSPARROW versions of previously developed SAS-based models of streamflow, suspended-sediment, total nitrogen, and total phosphorus conditions in the Midwest, Northeast, Pacific, Southeast, and Southwest Regions of the United States for water years 2000 - RSPARROW versions of previously developed SAS-based models of streamflow, suspended-sediment, total nitrogen, and total phosphorus conditions in the Midwest, Northeast, Pacific, Southeast, and Southwest Regions of the United States for water years 2000 -

The USGS Spatially Referenced Regression on Watershed attributes (SPARROW) model is a hybrid empirical/process-based mass balance model that can be used to estimate the major sources and environmental factors that affect the supply, transport, and fate of contaminants in streams and surface-water impoundments (Schwarz and others, 2006). This data release includes a set of 20 regional...
By
Oregon Water Science Center

Per- and polyfluoroalkyl substances (PFAS) and wastewater indicator compounds measured in polar organic chemical integrative samplers (POCIS), and cyanotoxin concentrations measured in solid phase adsorption toxin trackers (SPATTs), in the lower Columbia Per- and polyfluoroalkyl substances (PFAS) and wastewater indicator compounds measured in polar organic chemical integrative samplers (POCIS), and cyanotoxin concentrations measured in solid phase adsorption toxin trackers (SPATTs), in the lower Columbia

This data release contains the analytical results of three contaminant classes in water using two types of passive sampling devices. Samples were collected at eight sites in the lower Columbia River and two sites in the lower Willamette River in Oregon and Washington. A Polar Organic Compound Integrating Sampler (POCIS) and a Solid-Phase Adsorption Toxin Tracker (SPATT) sampler were...
By
Oregon Water Science Center

Watershed landscape data used in the dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Puget Sound and the Strait of Juan de Fuca, Washington, 2005 – 2020 Watershed landscape data used in the dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Puget Sound and the Strait of Juan de Fuca, Washington, 2005 – 2020

This data release contains the watershed ancillary data that were used as input for a set of dynamic Spatially Referenced Regression On Watershed attributes (SPARROW) models for watersheds draining to Puget Sound and the Strait of Juan de Fuca, Washington for the years 2005 - 2020. The SPARROW models were used to estimate mean seasonal total nitrogen and total phosphorous conditions and...
By
Oregon Water Science Center

Model application and calibration load data for seasonally dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Washington waters of the Salish Sea, 2005 through 2020 Model application and calibration load data for seasonally dynamic total nitrogen and total phosphorus SPARROW models developed for watersheds draining to Washington waters of the Salish Sea, 2005 through 2020

This data release contains two data sets: 1) the model application data for a set of dynamic total nitrogen (TN) and total phosphorus (TP) SPARROW (SPAtially Referenced Regression On Watershed attributes; Schwarz and others, 2006, https://doi.org/10.3133/tm6B3) load models that were developed for watersheds draining to Washington waters of the Salish Sea (Puget Sound region) 2005 through...
By
Oregon Water Science Center

Daily baseflow discharge and daily stream and baseflow total dissolved solids (TDS) loads for selected locations in the Upper Colorado River Basin for water years 1986 – 2020 Daily baseflow discharge and daily stream and baseflow total dissolved solids (TDS) loads for selected locations in the Upper Colorado River Basin for water years 1986 – 2020

This data release contains measured stream discharge and total dissolved solids (TDS) data and estimated values for daily stream TDS loads, daily baseflow discharge, and daily baseflow TDS loads for 205 locations in the Upper Colorado River Basin. The estimated values, which represent conditions between 10/1/1985 and 9/30/2020, were obtained using the Weighted Regressions on Time...
By
Utah Water Science Center
Filter Total Items: 24

Effects of climate on temporal variability in streamflow and salinity in the Upper Colorado River Basin Effects of climate on temporal variability in streamflow and salinity in the Upper Colorado River Basin

Study RegionThe Upper Colorado River Basin, a critical water source for more than 40 million people in the western United States.Study FocusPotential decreasing streamflow and elevated salinity concentrations threaten this resource. Climate variability has a large and well-studied effect on streamflow in the basin; however, the effect on salinity loading is less understood. This study...
Authors
Natalie K. Day, Patrick C. Longley, Daniel Wise, Morgan C. McDonnell
By
Colorado Water Science Center

Preprint: Simulated seasonal loads of total nitrogen and total phosphorus by major source from watersheds draining to Washington waters of the Salish Sea, 2005 through 2020 Preprint: Simulated seasonal loads of total nitrogen and total phosphorus by major source from watersheds draining to Washington waters of the Salish Sea, 2005 through 2020

The U.S. Geological Survey (USGS) and the Washington State Department of Ecology (Ecology) have developed watershed models of seasonal load estimates of total nitrogen (TN) and total phosphorus (TP) discharging into the Washington waters of the Salish Sea from 2005 through 2020. The modeling approach used was dynamic SPARROW (SPAtially Referenced Regressions On Watershed attributes), a...
Authors
Noah Schmadel, Cristiana Figueroa-Kaminsky, Daniel Wise, Jamie K. Wasielewski, Zachary Johnson, Robert W. Black
By
Ecosystems Mission Area, Water Resources Mission Area, Eastern Ecological Science Center, Washington Water Science Center

Salinity or sum of constituents— Methods comparison for computing dissolved solids concentrations in streams of the Upper Colorado River Basin Salinity or sum of constituents— Methods comparison for computing dissolved solids concentrations in streams of the Upper Colorado River Basin

The Colorado River is an important water source in the southwestern United States and northern Mexico. High concentrations of dissolved solids in the river, sourced mainly from the Upper Colorado River Basin (UCOL), cause hundreds of millions of dollars in damages annually to crops and infrastructure. Determinations of total dissolved solids (TDS) in river and tributary samples often...
Authors
Fred D. Tillman, Matthew P. Miller, Daniel Wise, R. Blaine McCleskey, Natalie K. Day
By
Water Resources Mission Area, Arizona Water Science Center

Database of surface water diversion sites and daily withdrawals for the upper Colorado River Basin, 1980–2022 Database of surface water diversion sites and daily withdrawals for the upper Colorado River Basin, 1980–2022

The Colorado River drains about 8% of the conterminous United States, provides water for 40 million people, and is one of the most overallocated rivers in the world. As the upper Colorado River Basin (UCOL) contributes an estimated 92% of the total basin natural streamflow, knowledge of the location and amount of surface water withdrawals in the UCOL is important for managing the...
Authors
Samuel Francisco Lopez, Jacob E. Knight, Fred D. Tillman, Melissa D. Masbruch, Daniel Wise, Casey J.R. Jones, Matthew P. Miller
By
Water Resources Mission Area, Utah Water Science Center

Assessing the effects of chloride deicer applications on groundwater near the Siskiyou Pass, southwestern Oregon, July 2018–February 2021 Assessing the effects of chloride deicer applications on groundwater near the Siskiyou Pass, southwestern Oregon, July 2018–February 2021

The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation (ODOT), evaluated the effects of cold-weather chloride deicers (road deicing chemicals) on groundwater quality, with a focus on chloride, near the Siskiyou Pass in southwestern Oregon. The study covered the period during July 2018 through February 2021. Between the years 2016 and 2020 ODOT applied up...
Authors
Stephen B. Gingerich, Daniel R. Wise, Adam J. Stonewall
By
Water Resources Mission Area, Oregon Water Science Center

Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type Salinity and total dissolved solids measurements for natural waters: An overview and a new salinity method based on specific conductance and water type

The total concentration of dissolved constituents in water is routinely quantified by measurements of salinity or total dissolved solids (TDS). However, salinity and TDS are operationally defined by their analytical methods and are not equivalent for most waters. Furthermore, multiple methods are available to determine salinity and TDS, and these methods have inherent differences. TDS is...
Authors
R. Blaine McCleskey, Charles A. Cravotta, Matthew P. Miller, Fred D. Tillman, Paul E. Stackelberg, Katherine J. Knierim, Daniel Wise
By
Water Resources Mission Area, National Water Quality Program, Arizona Water Science Center, Lower Mississippi-Gulf Water Science Center, Oregon Water Science Center, Pennsylvania Water Science Center

Visualizations of water quality across the conterminous United States using SPARROW 2012 simulated nutrient load estimates Visualizations of water quality across the conterminous United States using SPARROW 2012 simulated nutrient load estimates

This pipeline uses the data from the 2012 regional Sparrow models (see **Input datasets** below) to produce four types of outputs: 1. Maps of SPARROW-estimated total nitrogen, total phosphorus, and total suspended-sediment yields and concentrations across the conterminous United States (CONUS); 2. Bar plots showing the amount of total nitrogen, total phosphorus, and suspended sediment...
By
Water Resources Mission Area, Integrated Water Availability Assessments

SPARROW modeling: Estimating contaminant transport SPARROW modeling: Estimating contaminant transport

SPARROW (SPAtially Referenced Regression On Watershed attributes) models estimate the amount of a contaminant transported from inland watersheds to larger water bodies by linking monitoring data with information on watershed characteristics and contaminant sources.
By
Oregon Water Science Center
New Publication - Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass, Southwestern Oregon

New Publication - Assessing the Effects of Chloride Deicer Applications on Groundwater near the Siskiyou Pass, Southwestern Oregon

The U.S. Geological Survey, in cooperation with the Oregon Department of Transportation, evaluated the effects of cold-weather chloride deicers (road...

Read Article
USGS uses watershed modeling to assess surface-water nutrient impairment across the Pacific Northwest and California

USGS uses watershed modeling to assess surface-water nutrient impairment across the Pacific Northwest and California

The region-wide, reach-scale results from a new study provide two new tools that might help water-quality managers. One is an estimate of the total...

Read Article
Surface-water nutrient and sediment mappers are now available

Surface-water nutrient and sediment mappers are now available

SPARROW mappers are interactive tools that allow users to evaluate streamflow and nutrient and sediment conditions as well as the importance of...

Read Article
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