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Gregory Daniel Clark

Greg is a project chief in the groundwater and water quality section at the Wyoming-Montana Water Science Center.

Greg’s training is in hydrologic response to landscape disturbance and his work typically focuses on the linkages between water chemistry and watershed characteristics. He works with local, state, and federal partners to develop a scientific understanding of watershed response to significant landscape disturbances that can be used in future decision making. This work primarily centers on, but is not limited to, water quality response to wildfire, mining, and logging. Greg has a particular interest in using continuous water quality sensing to characterize event-based response in these landscapes.

Professional Experience

  • 2019 - present Hydrologist [Project Chief], U.S. Geological Survey Wyoming-Montana Water Science Center.

  • 2018 - 2019 Terrestrial Field Ecologist, NSF-Batelle, National Ecological Observatory Network, Front Royal, Virginia.

Education and Certifications

  • M.S. Environmental Science (Soils), Washington State University, 2018.

  • B.S. Environmental Resource Management (Water Science), Pennsylvania State University, 2016.

Science and Products

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
By
Water Resources Mission Area, California Water Science Center, Colorado Water Science Center, Kansas Water Science Center, New Mexico Water Science Center, Oregon Water Science Center, Oklahoma-Texas Water Science Center

Water-quality, bed-sediment, and invertebrate tissue trace-element concentrations for tributaries in the Clark Fork Basin, Montana, October 2019–September 2020

Water, bed sediment, and invertebrate tissue were sampled in streams from Butte to near Missoula, Montana, as part of a monitoring program in the Clark Fork Basin. The sampling program was completed by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, to characterize aquatic resources in the Clark Fork Basin and monitor trace elements associated with histori
Authors
Gregory D. Clark, Michelle I. Hornberger, Eric J. Hepler, Terry L. Heinert
By
Water Resources Mission Area, Wyoming-Montana Water Science Center

Water-quality, bed-sediment, and invertebrate tissue trace-element concentrations for tributaries in the Clark Fork Basin, Montana, October 2018–September 2019

Water, bed sediment, and invertebrate tissue were sampled in streams from Butte to near Missoula, Montana, as part of a monitoring program in the Clark Fork Basin. The sampling program was completed by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, to characterize aquatic resources in the Clark Fork Basin and monitor trace elements associated with histori
Authors
Gregory D. Clark, Michelle I. Hornberger, Eric J. Hepler, Thomas E. Cleasby, Terry L. Heinert
By
Water Resources Mission Area, Wyoming-Montana Water Science Center

Water-quality, bed-sediment, and invertebrate tissue trace-element concentrations for tributaries in the Clark Fork Basin, Montana, October 2017–September 2018

Water, bed sediment, and invertebrate tissue were sampled in streams from Butte to near Missoula, Montana, as part of a monitoring program in the Clark Fork Basin. The sampling program was completed by the U.S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, to characterize aquatic resources in the Clark Fork Basin and monitor trace elements associated with histori
Authors
Gregory D. Clark, Michelle I. Hornberger, Thomas E. Cleasby, Terry L. Heinert, Matthew A. Turner
By
Water Resources Mission Area, Wyoming-Montana Water Science Center

Non-USGS Publications**

GD Clark, KB Moffett (2018). Multiple wildfire disturbances amplify seasonal moisture stress in a moist, mixed-conifer montane ecosystem. Washington State University. Pullman, Washington.

**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.

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Mule Creek, tributary to Camas Creek (Meagher, Co) at Mule Creek Met Station

Wildfires and Water Quality in Montana

The WY-MT WSC is collaborating with the USGS Water Mission Area and other federal and state partners to quantify and understand the effects wildfires have on water quality. These findings provide high value datasets to researchers and assist resource managers with decision making in fire-prone landscapes throughout Wyoming and Montana. Two watersheds are currently being studied in Montana. Each...
By
Wyoming-Montana Water Science Center
link

Wildfires and Water Quality in Montana

The WY-MT WSC is collaborating with the USGS Water Mission Area and other federal and state partners to quantify and understand the effects wildfires have on water quality. These findings provide high value datasets to researchers and assist resource managers with decision making in fire-prone landscapes throughout Wyoming and Montana. Two watersheds are currently being studied in Montana. Each...
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Clark Fork 4

Long-Term Surface-Water Monitoring in the Upper Clark Fork River Basin

The U.S. Geological Survey (USGS) has collected water-quality samples from selected stream sites upstream from Missoula since 1985.
By
Wyoming-Montana Water Science Center
link

Long-Term Surface-Water Monitoring in the Upper Clark Fork River Basin

The U.S. Geological Survey (USGS) has collected water-quality samples from selected stream sites upstream from Missoula since 1985.
Learn More
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Science and Products