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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. These web pages are intended to provide an overview of that project, and to provide selected data from the Tualatin River Basin.

Highlights (new!)

image: wwtp.jpg
Rock Creek Wastewater Treatment Plant
(Photo by S. Rounds)
The Tualatin River / Wapato Lake blue-green algae bloom that occurred in 2008 has been documented in a new USGS report, available online at:

Read an annotated bibliography of published research results in the Tualatin River basin over the last 20+ years. These historical studies are being used to better understand Tualatin River ecosystems and prioritize future data collection and research activities as well as potential management strategies.

Project Links

o General information
Description of the basin and the project
o 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)
o Continuous Water Quality Monitors
Water-quality data from selected Tualatin River Basin monitors
o Water Quality Samples
Water-quality data from samples collected from Tualatin River Basin sites
o Weather and Precipitation
Portland Metropolitan area weather and precipitation links
o Hagg Lake Water-Quality Model
Information, GIS datasets, models, and visualizations of model output for the USGS water-quality model of Henry Hagg Lake
o Hagg Lake Model Scenarios
Information, models, and model output for the USGS dam-raise simulations Henry Hagg Lake
o Posters
Conference posters used to communicate results from studies and data
o Reports
Published reports from the project
Recent reports:
  • documentation of the 2008 Tualatin River / Wapato Lake blue-green algae bloom (new!)
  • three papers and a Fact Sheet documenting the sources and transport of organic matter in Fanno Creek
  • characterization of Tualatin River plankton communities
  • use of fluorescence techniques to identify wastewater in Tualatin River streams


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Page Contact Information: Stewart Rounds
Page Last Modified: Tuesday - Dec 22, 2015 at 11:07:17 EST