Watershed/Basin Studies
Watershed/Basin Studies
Filter Total Items: 43
Water-quality monitoring during reservoir drawdowns
The USGS is monitoring water-quality above, within, and below Middle Fork Willamette and the South Santiam River dams to understand how reservoir drawdowns influence downstream water-quality conditions.
Harney Basin Groundwater Study
In response to increasing groundwater demand and declining groundwater levels in the Harney Basin of southeastern Oregon, the U.S. Geological Survey and Oregon Water Resources Department conducted a groundwater-availability study during 2016–22. Read to learn about the key findings
Multiscale comparison of hyperspectral reflectance from periphyton in three Oregon rivers used for municipal supply
In this study, USGS scientists from multiple centers used advanced hyperspectral imaging techniques to advance monitoring of attached benthic algae (periphyton) in Cascade Range rivers used for municipal water supply. Periphyton are naturally occurring, but excess growth can harm ecosystems and degrade raw and treated drinking water quality. In these rivers, periphyton contain cyanobacteria that...
Estimating Groundwater Budgets for Oregon
Scientists Stephen Gingerich and Adel Haj, Jr. are leading efforts to estimate groundwater budgets across the state. Water hidden beneath the earth’s surface is a vital resource and quantifying its availability is crucial for long-term management. USGS scientists are collaborating with scientists at the Oregon Water Resources Department to gain a better understanding of this valuable resource.
Willamette FIP Effectiveness Monitoring Framework
The goal of this project is to develop an effectiveness monitoring framework that can be used to inform monitoring and data collection for the Willamette River Focused Investment Partnership (WFIP) Effectiveness Monitoring Program. The USGS is developing this monitoring framework in collaboration with the Benton Soil and Water Conservation District (BSWCD), Bonneville Environmental Foundation (BEF...
Fernhill Natural Treatment Wetlands
The amount and type of algae in the Tualatin River affect the river’s water quality and ecological health, as well as its value as a recreational resource. As a relatively new source of summertime flow to the upper Tualatin River, discharges from the Fernhill Natural Treatment System (NTS) have the potential to enhance or degrade downstream water quality. Discharges of low nutrient concentrations...
Synthesizing the State of Science of Coldwater Refuges in the Willamette River Basin
Many regulatory, management, and conservation organizations are interested in protecting and increasing coldwater refuges and thermal diversity for Chinook salmon, steelhead, and other natives fishes in the Willamette River basin. This study synthesizes current and emerging science related to coldwater refuges and thermal diversity. It is also develops conceptual frameworks for understanding the...
Controls on Habitat for Native Lampreys in the Umpqua River Basin
Native lampreys are culturally significant fishes for tribal communities in Oregon. As such, the USGS has begun working with the Cow Creek Band of Umpqua Tribe of Indians to study changes that may be affecting habitat for native Pacific and western brook lampreys in the Umpqua River basin.
Willamette Instream Flows
When streamflow fluctuates in the Willamette River so does the amount of available rearing habitat used by Threatened Upper Willamette River spring Chinook salmon and winter steelhead trout. The USGS investigates how flow conditions and dam operations affect rearing habitat availability so that flow managers can maintain suitable flows for these species.
Geomorphic Response to Fall Creek Lake Drawdowns
The USGS has been documenting the geomorphic response to the annual Fall Creek Lake drawdown since 2011.
Vertical Hydraulic Gradient at the Sediment-Water Interface in Upper Klamath Lake
"The goal of this project is to characterize the vertical hydraulic gradient at the sediment-water interface in Upper Klamath Lake."
Ecosystem Effects of Increased Coal Transport Across the Pacific Northwest
Proposed new coal export terminals in Washington and Oregon could increase rail traffic through the Northwest and potentially increase unintended release of coal dust to the environment.