In recent years, attention has been drawn to the presence of Blue-Green Algae, or Cyanobacteria, at unsafe, high levels in the Russian River waters in late summer.
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One of the greatest threats to water quality in the Russian River and most of the United States is polluted urban run-off. Urban areas have high amounts of what we call impervious surfaces such as driveways, parking lots, roads, rooftops that are hardened and do not absorb water.
If you see a bloom, stay out of the water and keep your pets and livestock out of the water. You cannot tell if a bloom is harmful by looking at it, so it is best to use caution and stay away. Do not fish, swim, boat, or play water sports in areas where there are harmful algae or cyanobacteria.
Algae, including blue-green algae (aka cyanobacteria), can be normally found in many water environments, such as the Russian River. When high temperatures and increased nutrient levels in the water occur, algae can grow more rapidly than normal.