Tualatin River Basin Water Quality Assessment

In 1990, the Oregon Water Science Center of the U.S. Geological Survey began a water-quality assessment of the Tualatin River, in partnership with Clean Water Services (formerly Unified Sewerage Agency of Washington County, Oregon). These web pages are intended to provide an overview of that project, and to provide selected data from the Tualatin River Basin.

Rock Creek Wastewater Treatment Plant (Photo by S. Rounds)

General information

Description of the basin and the project
 

Streamflow and Stage

Near-real-time streamflow and stage data from selected Tualatin River Basin sites (data from USGS and Oregon Water Resources Department sources)
 

Continuous Water Quality Monitors

Water-quality data from selected Tualatin River Basin monitors
 

Water Quality Samples

Water-quality data from samples collected from Tualatin River Basin sites
 

Weather and Precipitation

Portland Metropolitan area weather and precipitation links
 

Hagg Lake Water-Quality Model

Information, GIS datasets, models, and visualizations of model output for the USGS water-quality model of Henry Hagg Lake
 

Hagg Lake Model Scenarios

Information, models, and model output for the USGS dam-raise simulations Henry Hagg Lake
 

Reports

Published reports from the project
Recent reports:

• Hagg Lake model scenarios
• evaluation of optical dissolved oxygen probes
• modifications to the CE-QUAL-W2 model to support reservoir outlet temperature blending

Other Links of Interest:

USGS, Oregon Water Science Center

Home page for USGS Water Resources Division operations in Oregon
 

USGS Publications Warehouse

Database and links to more than 60,000 USGS reports
 

USGS real-time streamflow data

...for Oregon stations
 

USGS historic streamflow data

...for Oregon stations
 

Washington County Watermaster home page
 

Tualatin River Watershed Council home page
 

Tualatin Basin Water Supply project
 

Tualatin TMDL documents from the Oregon Department of Environmental Quality.