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Scientific Investigations Report 2009–5078

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

Table 11. Summary of continuous water-quality monitoring for water temperature, dissolved oxygen concentration, and pH, in the Zillah reach between RM 103 and 87, Yakima River, Washington, July 26–August 9, 2006, July 17–July 31, 2007, and August 23–September 3, 2007.

[Abbreviations: RM, river mile; °C, degrees Celsius; mg/L, milligram per liter]

Monitoring period Location Water
temperature
greater than
21ºC
(percentage
of time)
Dissolved
oxygen
concentration
less than
8 mg/L
(percentage
of time)
pH greater
than 8.5 pH
units
(percentage
of time)
July 26 – August 9, 2006 Yakima River at RM 92 22 26 42
  Yakima River at RM 87 37 35 35
July 17 – July 23, 2007 Yakima River at RM 103 0 0 5
July 17 – July 31, 2007 Yakima River at RM 87 41 22 24
August 23 – September 3, 2007 Yakima River at RM 103 0.7 1.8 21
  Yakima River at RM 87 29 41 29

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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