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Scientific Investigations Report 2009–5078

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

Table 8. Summary of macrophyte biomass measured in the Kiona reach of the Yakima River, Washington, near river mile 21, 2005–07.

Transect Median dry weight
(grams per square meter)
2005   2006   2007
August 30–
September 2		 Number of
samples
collected		 September 1 Number of
samples
collected		 September 7 Number of
samples
collected
T1 (upstream) 913 5   0 4   0 5
T2 836 5 12 4 0 5
T3 1,034 5 37 5 378 5
T4 566 5 48 5 230 5
T5 1,769 3 236 4 91 5
T6 (downstream) 1,354 5 486 5 634 5
All samples 1,020 28 32 27 84 30
95 percent confidence interval 723–1,495 19–171 70–472

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