Table 6. Planktonic (water column) chlorophyll a in the lower Yakima and Naches Rivers, Washington, 2004–05.
[Point (grab) sample concentration data given in micrograms per liter (μg/L). Samples analyzed spectrophotometrically by the Bureau of Reclamation Laboratory, Boise, Idaho. Shading indicates chlorophyll a value that was above nuisance condition level. Abbreviation: RM, river mile]
USGS site
identification
No. |
Site name |
RM |
Date |
Chlorophyll a
(µg/L) |
| Naches Reach |
| 12499000 |
Naches River near North Yakima |
1.0 |
05-24-04 |
2.2 |
|
06-30-04 |
0.8 |
| Zillah Reach |
| 12487000 |
Yakima River at Selah Gap near North Yakima |
117.0 |
07-26-04 |
3.4 |
|
05-24-04 |
5.3 |
|
06-28-04 |
5.1 |
| 12500450 |
Yakima River above Ahtanum Creek at Union Gap |
107.3 |
07-26-04 |
3.2 |
| 12504490 |
Sunnyside Canal at Diversion near Parker |
103.8 |
05-25-04 |
4.6 |
|
06-30-04 |
2.5 |
| 12505330 |
Yakima River above East Toppenish Drain near Granger |
86.5 |
06-23-05 |
6.6 |
| 12505320 |
Yakima River at RM 91 at Zillah |
91.2 |
07-27-04 |
2.7 |
| 12505330 |
Yakima River above East Toppenish Drain near Granger |
86.5 |
04-05-05 |
19.2 |
|
04-27-05 |
17.5 |
|
04-19-05 |
11.1 |
|
05-24-04 |
7.8 |
|
05-19-05 |
7.2 |
|
06-23-05 |
6.6 |
|
06-28-05 |
6.5 |
|
10-13-05 |
4.4 |
|
08-18-05 |
2.8 |
|
06-28-04 |
2.7 |
|
07-27-04 |
2.6 |
| 12505440 |
Yakima River at Bridge Avenue at Granger |
83.0 |
07-27-04 |
3.5 |
| 12507580 |
Yakima River above Satus Creek at RM 73 near Satus |
73.0 |
07-27-04 |
3.6 |
| Mabton Reach |
| 12507584 |
Yakima River at Murray Road near Sunnyside |
72.0 |
05-25-04 |
8.9 |
|
06-30-04 |
4.8 |
|
09-21-04 |
4.5 |
| 12508680 |
Yakima River above Sulphur Creek at RR 61.3 near Mabton |
61.3 |
07-28-04 |
10.8 |
| Mabton Reach—Continued |
| 12509060 |
Yakima River at Mabton Siphon near Grandview |
53.0 |
09-14-05 |
20.7 |
|
03-31-05 |
19.5 |
|
06-23-05 |
18.3 |
|
08-09-05 |
17.9 |
|
04-15-05 |
15.1 |
|
05-12-05 |
14.7 |
|
05-25-05 |
12.9 |
|
08-09-05 |
12 |
|
03-15-05 |
9.9 |
|
04-28-05 |
8.9 |
| 12509050 |
Yakima River at Euclid Bridge near Grandview |
55.0 |
07-28-04 |
15.5 |
|
08-10-05 |
13.3 |
|
08-10-05 |
11.7 |
| 12509489 |
Yakima River at Prosser |
47.0 |
06-29-05 |
15.9 |
| Kiona Reach |
| 12509900 |
Yakima River above Chandler Pump near Whitstran |
37.0 |
06-30-04 |
9.8 |
| 12510500 |
Yakima River at Kiona |
29.9 |
04-26-05 |
15.4 |
|
04-11-05 |
12.9 |
|
08-10-05 |
12.5 |
|
04-25-05 |
10.4 |
|
09-14-05 |
10.1 |
|
05-12-05 |
6.2 |
|
04-20-04 |
4.4 |
|
10-12-05 |
3.4 |
|
09-20-04 |
2.5 |
|
09-21-04 |
2.3 |
|
09-23-04 |
2.1 |
|
06-30-04 |
1.7 |
|
09-22-04 |
1.7 |
| 12511800 |
Yakima River at Van Geisan Bridge near Richland |
8.4 |
07-29-04 |
2.6 |
|
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U.S. Department of the Interior | U.S. Geological Survey