Oregon Health Authority website has information on Blue-Green Algae, including Current Cyanobacteria Advisories. They note, "Don't go into water that looks foamy, scummy, thick like paint, pea-green, blue-green or brownish red. A good rule of thumb for you and your pet is: When in Doubt, Stay Out!"
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Beef cattle, Sheep and goats, Weeds, Ponds