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Scientific Investigations Report 2009–5078

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

Table 10. Percentage of days and percentage of time when threshold values were exceeded for daily maximum water temperature, daily mean turbidity, daily minimum dissolved oxygen concentration, and daily maximum pH, Yakima River at Kiona, Washington, 2004–07.

[Threshold values for water temperature, dissolved oxygen, and pH are the Washington State water-quality standards for the Yakima River. Abbreviations: FNU, Formazin nephelometric units; °C, degrees Celsius; mg/L, milligram per liter; –, no data collected; <, less than]

Days/time when maximum temperature was greater than 21°C (percent)
Year January February March April May June July August September October November December
2004 0/0 10/8 67/38 100/55 100/57 11/29 0/0 0/0 0/0
2005 0/0 0/0 0/0 0/0 26/18 89/55 100/99 100/96 17/9 0/0 0/0 0/0
2006 0/0 0/0 0/0 0/0 0/0 27/18 100/99 100/90 40/16 0/0 0/0 0/0
2007 0/0 0/0 0/0 0/0 0/0 60/24 100/97 97/84 46/20
Days/time when minimum dissolved oxygen concentration was less than 8 mg/L (percent)
Year January February March April May June July August September October November December
2004 0/0 29/8 96/38 100/55 100/57 96/29 43/8 0/0 0/0
2005 0/0 0/0 0/0 63/17 85/29 100/39 100/57 100/58 100/46 46/16 0/0 0/0
2006 0/0 0/0 0/0 0/0 0/0 19/5 100/42 100/39 63/17 6/2 0/0 0/0
2007 0/0 0/0 0/0 0/0 0/0 40/12 100/47 100/43 89/28
Days/time when maximum pH was greater than 8.5 (percent)
Year January February March April May June July August September October November December
2004 100/55 65/27 100/46 100/43 83/27 95/45 48/18 17/<1 0/0
2005 0/0 25/7 100/55 87/66 96/60 100/79 100/79 100/58 93/42 39/3 53/3 0/0
2006 0/0 21/5 100/57 0/0 32/10 97/78 100/60 100/48 100/45 100/25 19/4 0/0
2007 0/0 57/9 0/0 40/21 58/17 70/44 100/58 100/52 96/51
Days/time when average turbidity was greater than 20 FNU (percent)
Year January February March April May June July August September October November December
2004 40/25 0/0 0/0 0/0 0/0 0/0 0/0 0/0 3/4
2005 5/3 0/0 0/0 3/1 3/1 0/0 0/0 0/0 0/0 0/0 0/0 23/19
2006 61/54 0/0 3/<1 44/46 61/61 53/53 0/0 0/0 0/0 3/0 15/11 6/8
2007 10/12 14/13 59/56 57/44 48/28 20/17 6/6 3/0 0/0

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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