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Scientific Investigations Report 2009–5078

Assessment of Eutrophication in the Lower Yakima River Basin, Washington, 2004–07

Table 9. Summary of water temperature, dissolved oxygen, and pH conditions in the Yakima River, Washington, March 1–June 30 and July 1–September 30, 2004–07.

[Kiona, U.S. Geological Survey (USGS) site 12510500 at RM 30; Mabton, USGS site 12509060 at RM 55; Zillah, USGS site 12505330 at RM 87. Abbreviations: mg/L, milligram per liter; –, no data]

Year Percentage of time water temperature was greater than Washington State standard (21 degrees Celsius)
March 1 – June 30   July 1 – September 30
Kiona Mabton Zillah Kiona Mabton Zillah
12004 22   66
2005 17 14 4.5 69 64 48
2006 4 0.6 68 29
2007 6 69
Year Percentage of time dissolved oxygen concentration was less than Washington State standard (8 mg/L)
March 1 – June 30   July 1 – September 30
Kiona Mabton Zillah Kiona Mabton Zillah
12004 21   47
2005 19 6.0 18 54 20 48
2006 1 0 33 33 33
2007 3 42
Year Percentage of time pH was greater than Washington State standard (8.5)
March 1 – June 30   July 1 – September 30
Kiona Mabton Zillah Kiona Mabton Zillah
12004 39   38
2005 65 21 50 60 30 37
2006 36 16 51 38
2007 22 54

1Monitored data collection at Kiona began on April 20, 2004.

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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