WARNING: Blue-Green Algae Bloom CONFIRMED in Dean Lake September 28, 2010: Algoma Public Health (APH) has issued a warning that a Blue-Green Algae bloom has been confirmed in Dean Lake. APH advises the following: DO NOT swim during an algae bloom DO NOT drink water from the lake (this includes pets) if illness develops, consult your physician For more information please call Algoma Public Health Blind River office: (705) 356-2551