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Publication: Open-File Report 2007-1408

U.S. GEOLOGICAL SURVEY
Open-File Report 2007-1408

Total Dissolved Gas and Water Temperature in the Lower Columbia River, Oregon and Washington, 2007: Quality-Assurance Data and Comparison to Water-Quality Standards

Prepared in cooperation with the U.S. Army Corps of Engineers

By Dwight Q. Tanner, Heather M. Bragg, and Matthew W. Johnston

Water quality monitoring

A USGS scientist calibrates the water-quality station below John Day Dam, December 27, 2006.

Significant Findings

When water is released through the spillways of dams, air is entrained in the water, increasing the downstream concentration of dissolved gases. Excess dissolved-gas concentrations can have adverse effects on freshwater aquatic life. The U.S. Geological Survey (USGS), in cooperation with the U.S. Army Corps of Engineers, collected dissolved-gas and water-temperature data at eight sites on the lower Columbia River in 2007. Significant findings from the data include:

Contents

Significant Findings
Introduction
Purpose and Scope
Methods of Data Collection
Summary of Total-Dissolved-Gas Data Completeness and Quality
Quality-Assurance Data
Effects of Spill on Total Dissolved Gas
Comparison of Total Dissolved Gas and Temperature to Standards
References Cited

This report is available online in Portable Document Format (PDF). If you do not have the Adobe Acrobat PDF Reader, it is available for free download from Adobe Systems Incorporated.

Download the report (PDF, 1.7 MB)

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Send questions or comments about this report to the author, D.Q. Tanner, (503)251-3289.

For more information about USGS activities in Oregon, visit the USGS USGS Oregon Water Science Center home page.

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