Something bad is blooming at Anderson Lake, a popular trout fishing destination, which has closed it to fishing and all water related activities including swimming.
This 70-acre lake in Jefferson County, which ranks as one of the top trout fishing destinations in Western Washington, is undergoing a spring bloom made up predominantly of the genus Anabaena which is harmful to humans and pets.
Tests performed at King County Environmental Labs show that this bloom is producing anatoxin-a, a potent neurotoxin.
Water samples taken on May 11 show anatoxin-a concentrations at 103 µg/L, which is 100 times the proposed safe recreational limit of 1 µg/L.
State Health will continue to monitor the lake weekly.
Other nearby alternative lakes recently planted with trout are Horseshoe, Ludlow, Sandy Shore, Silent, Tarboo and Teal.
For more information, call 360-385-1259 or go to Jefferson County Public Health Web site.