A caution advisory remained in effect for Lake Oroville’s Middle Fork due to a visible algal bloom. The Department of Water Resources issued the advisory after observing the bloom on July 3. DWR staff collected a sample of the algal bloom for analysis, finding no toxins present. Officials say they will continue monitoring the bloom and collecting samples if conditions change. The advisory will stay in place until the bloom dissipates. … Blue-green algae, also known as cyanobacteria, naturally occur in ecosystems. Under certain conditions, such as warmer temperatures and increased nutrients, algae can grow rapidly, causing blooms.

Other water quality advisory news:

• KRCR (Redding, Calif.): Chico expands no-swim advisory to Big Chico Creek amid E. coli outbreak concerns​