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

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.

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