Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, 2007: Quality-assurance data and comparison to water-quality standards
Open-File Report
2007-1408
Prepared in cooperation with the U.S. Army Corps of Engineers
By: Dwight Q. Tanner, Heather M. Bragg, and Matthew W. Johnston
Links
- More information: USGS Index Page (html)
- Document: Report (1.50 MB pdf)
- Download citation as: RIS | Dublin Core
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:
- From early July to mid-September 2007, water temperatures were above 20°C (degrees Celsius) at each of the eight lower Columbia River sites. According to the Oregon temperature standard, the 7-day average maximum temperature of the lower Columbia River should not exceed 20°C; Washington regulations state that the 1-day maximum should not exceed 20°C due to human activities.
- Most in-situ field checks of total-dissolved-gas sensors with a secondary standard were within ± (plus or minus) 1% saturation after 3 to 4 weeks of deployment in the river. All of the field checks of barometric pressure were within ±2.5 millimeter of mercury of a secondary standard, and water-temperature field checks were all within ±0.2 °C.
- For the eight monitoring sites in water year 2007, an average of 99.5% of the total-dissolved-gas data were received in real time by the USGS satellite downlink and were within 1% saturation of the expected value on the basis of calibration data, replicate quality-control measurements in the river, and comparison to ambient river conditions at adjacent sites. Data received from the sites ranged from 97.9% to 100.0% complete.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Total dissolved gas and water temperature in the lower Columbia River, Oregon and Washington, 2007: Quality-assurance data and comparison to water-quality standards |
| Series title | Open-File Report |
| Series number | 2007-1408 |
| DOI | 10.3133/ofr20071408 |
| Edition | - |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Oregon Water Science Center |
| Description | vi, 23 p. |
| State | Oregon, Washington |
| Other Geospatial | Lower Columbia River |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |