Oregon Water Science Center

Watershed/Basin Studies

Filter Total Items: 40
Date published: April 6, 2017

A Thermal Mosaic for the Willamette River

The U.S. Army Corps of Engineers operates 12 dams in the Willamette River Basin. The dams alter natural temperature and hydrologic regimes. Unnatural water temperatures can negatively impact all life stages of salmonid fish species. Water temperature in the mainstem Willamette River regularly exceeds the standard of 18.0 °C (64.4 °F) designated for salmon and trout rearing and migration for...

Date published: March 31, 2017
Status: Completed

Columbia River Contaminants and Habitat Characterization Study

Fish, wildlife, and human populations along the lower Columbia River are exposed to an ever-growing variety of contaminants as a result of increasing urbanization, industrialization, and agricultural development.

Date published: June 1, 2016
Status: Active

Future Water Clarity and Dissolved Oxygen in Crater Lake

Warming air temperature may change water temperature and water column mixing in Oregon’s Crater Lake over the next several decades, potentially impacting the clarity and health of the iconic lake.

Contacts: Tamara Wood
Date published: December 7, 2015
Status: Completed

Geomorphology of the Sprague River Basin

The USGS documents historical and current channel and floodplain processes and conditions to assist management and regulatory agencies in evaluating restoration proposals and designing effective restoration and monitoring strategies for the Sprague River and its principle tributaries. The study involves multiple analyses, including assessments of historical channel change, riparian and...

Contacts: Jim E O'Connor
Date published: October 31, 2015
Status: Active

North Santiam River Basin Study

The streamflow and water-quality conditions monitored by the USGS in the North Santiam River basin provide valuable information to water resource managers

Date published: January 8, 2015
Status: Active

Nutrient and Sediment Loading to Upper Klamath Lake

The USGS employs state-of-the-science techniques to estimate nutrient and suspended-sediment loads to Upper Klamath Lake.

Contacts: Liam Schenk
Date published: January 8, 2015
Status: Completed

Nutrient Loading to Lost River and Klamath River Subbasins

The USGS has characterized nutrient concentrations in the Klamath River and Lost River drainages over multiple years, identified spatial and temporal patterns in nutrient and organic carbon concentrations, and quantified surface water nutrient loads entering and exiting the Klamath Project.

Contacts: Liam Schenk
Date published: October 10, 2014
Status: Completed

Umpqua River Basin Studies

The Wild and Scenic North Umpqua River is one of the highest-quality waters in the State of Oregon, supporting runs of wild salmon, steelhead, and trout. The USGS has been studying water-quality in the Umpqua River Basin since 1998.

Date published: October 5, 2014
Status: Active

Fall Creek Drawdown

Each autumn Fall Creek Lake is drawn down to allow endangered juvenile salmonids to pass freely through the dam. The drawdowns involve lowering the lake water level to the lake bed, creating a fluvial environment characterized by large amounts of sediment being transported through the dam and into Fall Creek and the Middle Fork Willamette River.

Date published: December 19, 2013
Status: Completed

Columbia River Basalt Stratigraphy in the Pacific Northwest

The Columbia River Basalt Group (CRBG) consists of a thick sequence of Miocene flood basalt that covered northern Oregon, eastern Washington, and western Idaho between 17 and 6 million years ago. It is an important regional aquifer system, and, in its folded and faulted flows, it records the...

Contacts: Terrence Conlon
Date published: October 31, 2013
Status: Active

Clackamas River Basin Water-Quality Assessment

Starting in 1997, the USGS began routinely studying water resources in the Clackamas River Basin. Whether it be assessing harmful algal blooms, runoff issues, streamflow, or watershed health, the USGS has worked with its partners to maintain one of Oregon's most beloved rivers.

Date published: October 5, 2012
Status: Completed

Assessing Mercury Loads in Cottage Grove Reservoir

Cottage Grove Reservoir is an impoundment of the Coast Fork of the Willamette River and is managed by the U.S. Army Corps of Engineers (USACE) as part of the Willamette Valley Flood Control Plan.  The reservoir is currently under a fish consumption advisory because of elevated levels of mercury in fish tissue observed in an Oregon Department of Environmental Quality sampling survey in 2003 (...

Contacts: Liam Schenk