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 |
– |
– |
– |
|
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U.S. Department of the Interior | U.S. Geological Survey