USGS Scientific Investigations Report 2009–5078Assessment of Eutrophication in the Lower Yakima River Basin, Washington, 2004

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

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