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Scientific Investigations Report 2009–5078

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

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

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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