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The summertime concentrations of nitrogen and phosphorus in the Willamette River exceed the generally accepted threshold levels for excessive algal growth. Nevertheless, the primary productivity is low for a river, and the algal community is dominated by diatoms. Bioassay tests with various additions of nitrogen and phosphorus, minor nutrients, and municipal and industrial effluents showed no marked increase in algal production over control samples. Results suggest that algal growth in the Willamette is maintained in a state of healthy balance by short detention times of water and possibly also by low light availability resulting from turbidity.

Algal conditions and the potential for future algal problems in the Willamette River, Oregon