USGS hydrologist working in the field.
Hank Johnson
I am a research hydrologist at the USGS Oregon Water Science Center. I have been working on groundwater and water-quality issues regionally and nationally for more than 20 years. My research interests include arid-system hydrology, groundwater and spring systems, and environmental tracers.
Education and Certifications
B.S., Geological Sciences, Virginia Polytechnic Institute & State University, Blacksburg, Virginia, 1992
M.S., Environmental Science and Engineering, Oregon Graduate Institute of Science & Technology, Hillsboro, Oregon, 1996
Science and Products
Assessment of long-term changes in surface-water extent within Klamath Marsh, south-central Oregon, 1985–2021
Timing and source of recharge to the Columbia River Basalt groundwater system in northeastern Oregon
Groundwater resources of the Harney Basin, southeastern Oregon
Groundwater resources of the Harney Basin, southeastern Oregon
Groundwater development has increased substantially in southeastern Oregon’s Harney Basin since 2010, mainly for the purpose of large-scale irrigation. Concurrently, some areas of the basin experienced groundwater-level declines of more than 100 feet, and some shallow wells have gone dry. The Oregon Water Resources Department has limited new groundwater development in the basin until an improved u
Climate impacts on source contributions and evaporation to flow in the Snake River Basin using surface water isoscapes (δ2H and δ18O)
Nitrate in streams during winter low‐flow conditions as an indicator of legacy nitrate
Landscape drivers of dynamic change in water quality of US rivers
Deep aquifer recharge in the Columbia River Basalt Group, upper Umatilla River Basin, northeastern Oregon
Springs as hydrologic refugia in a changing climate? A remote sensing approach
Water-quality trends in the nation’s rivers and streams, 1972–2012—Data preparation, statistical methods, and trend results
A new approach for continuous estimation of baseflow using discrete water quality data: Method description and comparison with baseflow estimates from two existing approaches
Estimation of total nitrogen and total phosphorus in streams of the Middle Columbia River Basin (Oregon, Washington, and Idaho) using SPARROW models, with emphasis on the Yakima River Basin, Washington
Surface-water extent in the Klamath Marsh
Recharge to the Columbia River Basalt Groundwater System
Harney Basin Groundwater Study
Walla Walla River Basin groundwater-flow system, Oregon-Washington
Groundwater of the Umatilla River Basin
Spring Vulnerability Study for Southeastern Oregon
Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022
Location Information, Discharge, and Water-Quality Data for Selected Wells, Springs, and Streams in the Harney Basin, Oregon
Water-quality and streamflow datasets used in the Weighted Regressions on Time, Discharge, and Season (WRTDS) models to determine trends in the Nations rivers and streams, 1972-2012
Water-quality and streamflow datasets used in Seasonal Kendall trend tests for the Nations rivers and streams, 1972-2012
![USGS scientist collecting a water-quality sample from Zollner Creek, Oregon](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/zollner_creek_oregon_sampling_img_3169.jpg?itok=OUBUGTwn)
USGS Scientist Collecting a Water-Quality Sample from Zollner Creek, Oregon, for the Analysis of Dissolved Pesticides
linkU.S. Geological Survey (USGS) hydrologic technician Dan Polette collecting a water-quality sample from Zollner Creek, Oregon for a national-scale investigation of the environmental occurrence of neonicotinoid insecticides in agricultural and urban settings.
USGS Scientist Collecting a Water-Quality Sample from Zollner Creek, Oregon, for the Analysis of Dissolved Pesticides
linkU.S. Geological Survey (USGS) hydrologic technician Dan Polette collecting a water-quality sample from Zollner Creek, Oregon for a national-scale investigation of the environmental occurrence of neonicotinoid insecticides in agricultural and urban settings.
Science and Products
Assessment of long-term changes in surface-water extent within Klamath Marsh, south-central Oregon, 1985–2021
Timing and source of recharge to the Columbia River Basalt groundwater system in northeastern Oregon
Groundwater resources of the Harney Basin, southeastern Oregon
Groundwater resources of the Harney Basin, southeastern Oregon
Groundwater development has increased substantially in southeastern Oregon’s Harney Basin since 2010, mainly for the purpose of large-scale irrigation. Concurrently, some areas of the basin experienced groundwater-level declines of more than 100 feet, and some shallow wells have gone dry. The Oregon Water Resources Department has limited new groundwater development in the basin until an improved u
Climate impacts on source contributions and evaporation to flow in the Snake River Basin using surface water isoscapes (δ2H and δ18O)
Nitrate in streams during winter low‐flow conditions as an indicator of legacy nitrate
Landscape drivers of dynamic change in water quality of US rivers
Deep aquifer recharge in the Columbia River Basalt Group, upper Umatilla River Basin, northeastern Oregon
Springs as hydrologic refugia in a changing climate? A remote sensing approach
Water-quality trends in the nation’s rivers and streams, 1972–2012—Data preparation, statistical methods, and trend results
A new approach for continuous estimation of baseflow using discrete water quality data: Method description and comparison with baseflow estimates from two existing approaches
Estimation of total nitrogen and total phosphorus in streams of the Middle Columbia River Basin (Oregon, Washington, and Idaho) using SPARROW models, with emphasis on the Yakima River Basin, Washington
Surface-water extent in the Klamath Marsh
Recharge to the Columbia River Basalt Groundwater System
Harney Basin Groundwater Study
Walla Walla River Basin groundwater-flow system, Oregon-Washington
Groundwater of the Umatilla River Basin
Spring Vulnerability Study for Southeastern Oregon
Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022
Location Information, Discharge, and Water-Quality Data for Selected Wells, Springs, and Streams in the Harney Basin, Oregon
Water-quality and streamflow datasets used in the Weighted Regressions on Time, Discharge, and Season (WRTDS) models to determine trends in the Nations rivers and streams, 1972-2012
Water-quality and streamflow datasets used in Seasonal Kendall trend tests for the Nations rivers and streams, 1972-2012
USGS hydrologist working in the field.
![USGS scientist collecting a water-quality sample from Zollner Creek, Oregon](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/masonry/public/thumbnails/image/zollner_creek_oregon_sampling_img_3169.jpg?itok=OUBUGTwn)
USGS Scientist Collecting a Water-Quality Sample from Zollner Creek, Oregon, for the Analysis of Dissolved Pesticides
linkU.S. Geological Survey (USGS) hydrologic technician Dan Polette collecting a water-quality sample from Zollner Creek, Oregon for a national-scale investigation of the environmental occurrence of neonicotinoid insecticides in agricultural and urban settings.
USGS Scientist Collecting a Water-Quality Sample from Zollner Creek, Oregon, for the Analysis of Dissolved Pesticides
linkU.S. Geological Survey (USGS) hydrologic technician Dan Polette collecting a water-quality sample from Zollner Creek, Oregon for a national-scale investigation of the environmental occurrence of neonicotinoid insecticides in agricultural and urban settings.