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Scientific Investigations Report 2009–5078

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

Table 5. Periphyton biomass in the lower Yakima and Naches Rivers, Washington, 2005–07.

[Algal biomass data from the Bureau of Reclamation laboratory, Boise, Idaho. Median values are given where replicates were analyzed. Shading indicates chlorophyll a value that was above nuisance condition level. Abbreviations: Chl a, chlorophyll a; Pheo-a, pheophytin a; AFDM, ash-free dry mass; mg/m2, milligram per square meter; g/m2, gram per square meter; RM, river mile; USGS, U.S. Geological Survey; –, no data]

USGS site identification No. Sampling location RM Date Number of
samples
Chl a
(mg/m2)
Pheo-a
(mg/m2)
AFDM
(g/m2)
Naches Reach, 2007
12494450 Naches River at RM 12.2 near Naches 12.2 07-24 3 34 3 17
08-07 3 70 5 23
12498690 Naches River above Diversion Dam near Yakima 3.5 08-23 3 41 7 15
09-03 3 49 4 13
12498990 Naches River at 40th Avenue near Yakima 2.8 07-24 3 20 3 9
08-07 3 46 5 15
Zillah Reach, 2005
1250532120 Yakima River at RM 90.9 near Zillah 90.9 06-28 1 83 119 26
1250532250 Yakima River at RM 90.1 near Zillah 90.1 06-28 1 93 88 28
1250532340 Yakima River at RM 89.5 near Zillah 89.5 06-28 1 92 236 47
Zillah Reach, 2006
12505045 Yakima River at RM 102.8 near Parker 102.8 07-11 2 255 48 63
12505060 Yakima River at RM 102.6 near Parker 102.6 07-11 2 168 18 42
12505085 Yakima River at RM 100.8 near Donald 100.8 07-11 2 214 31 48
12505090 Yakima River at RM 100.7 near Donald 100.7 07-11 2 82 10 29
1250532100 Yakima River below North Myers Road Bridge right bank near Zillah 91.0 07-12 2 340 26 58
1250532110 Yakima River below North Myers Road Bridge left bank near Zillah 91.0 07-12 2 178 26 61
1250532200 Yakima River at RM 90.4 near Zillah 90.4 07-12 2 144 27 56
1250532210 Yakima River at RM 90.3 near Zillah 90.3 07-12 2 305 67 103
1250532400 Yakima River 3 ft from right bank at RM 89 near Zillah 89.0 07-12 2 195 67 147
12505040 Yakima River at RM 103 near Wapato 103.0 08-14 3 67 19 22
12505100 Yakima River at Donald Road at RM 100.3, at Donald 100.3 08-14 3 57 5 16
12505310 Yakima River below Highway 22 near Toppenish 92.0 08-14 3 57 5 16
12505325 Yakima River at RM 88.1 near Toppenish 88.1 08-15 3 41 4 12
12505330 Yakima River above East Toppenish Drain near Granger 86.5 08-15 3 56 7 19
09-21 3 243 15
12505040 Yakima River at RM 103 near Wapato 103.0 10-02 3 132 11 24
12505100 Yakima R at Donald Road at RM 100.3, at Donald 102.5 10-03 3 225 15 36
12505310 Yakima River below Highway 22 near Toppenish 92.0 10-03 3 225 15 36
12505325 Yakima River at RM 88.1 near Toppenish 88.1 10-03 3 155 27 31
12505330 Yakima River above East Toppenish Drain near Granger 86.5 10-03 3 168 27 30
Zillah Reach, 2007
12505040 Yakima River at RM 103 near Wapato 103.0 05-30 3 66 9 16
12505330 Yakima River above East Toppenish Drain near Granger 86.5 05-30 3 38 23 12
12505040 Yakima River at RM 103 near Wapato 103.0 06-12 3 76 2 22
07-16 9 40 7 19
12505270 Yakima River at RM 94.4 near Buena 94.4 07-16 3 39 2 15
12505330 Yakima River above East Toppenish Drain near Granger 86.5 07-17 3 29 2 15
12505040 Yakima River at RM 103 near Wapato 103.0 07-31 9 54 5 25
12505270 Yakima River at RM 94.4 near Buena 94.4 07-31 6 31 3 21
12505330 Yakima River above East Toppenish Drain near Granger 86.5 07-31 3 30 2 20
12505040 Yakima River at RM 103 near Wapato 103.0 08-23 3 51 10 12
12505330 Yakima River above East Toppenish Drain near Granger 86.5 08-23 3 34 7 11
12505040 Yakima River at RM 103 near Wapato 103.0 09-03 3 72 8 20
12505330 Yakima River above East Toppenish Drain near Granger 86.5 09-03 3 77 6 16
Kiona Reach, 2007
12510500 Yakima River at Kiona 29.9 08-07 3 8 1 2

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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