A health advisory was issued July 18, 2018 for Fernan Lake by the Panhandle Health District and the Idaho Department of Environmental Quality. Water samples confirmed the presence of blue-green algae that can produce toxins harmful to humans and animals.
Updated information on harmful algae blooms in northern Idaho can be found online at: http://www.deq.idaho.gov/water-quality/surface-water/recreation-health-advisories/blue-green-algae/.