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Scientific Investigations Report 2007–5186

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186

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Table 15. Summary of total point-source annual nutrient loads as a percentage of predicted instream annual loads, Columbia River and Puget Sound basins, water year 2000.

[Abbreviations: TN, total nitrogen; TP, toal phosphorus; <, less than; >, greater than]

Constituent Number of sites with total annual point-source
catchment nutrient loads (percent)
< 25 25 – 50 50 – 75 > 75
TN 24 6 0 1
TP 13 15 2 1

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