Those of you who think there is no sewer outfall on the Cowlitz River need to think again. The Cowlitz salmon and trout hatcheries represent the second largest fish hatchery in the world, last I heard. The fish waste and feed waste coming from the hatcheries probably equal the nutrient load coming from the sewage treatment plant of a small town. This type of algae doesn't need really warm water; high 40s and low 50s is plenty warm enough.

Sincerely,

Salmo g.