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Posted on: June 1, 2018

Dierkes Lake Reopened; Samples Show Non-hazardous Algae

The City of Twin Falls has reopened Dierkes Lake and Dierkes Lake Park after test results showed that the discoloration in the lake does not pose a health risk to humans, pets, or wildlife. Tests showed that the lake’s sudden and vivid green hue is the result of Carteria — a normal algae growth that is not harmful.

Dierkes Lake has been reopened to the public for swimming, fishing and other activities. The lake will return to it’s normal color as the algae dissipates, but divers and swimmers should be aware that visibility in the water remains low.

Dierkes Lake Park was closed on Friday, May 25 as a precautionary measure while the city sent water samples to labs for analysis. The results of the analysis were returned and reviewed by officials with the Department of Environmental Quality and the City of Twin Falls. DEQ reported that the algae is not a harmful bacteria bloom, and based on the test results, the water is safe for human use.

The city appreciates the public’s patience and understanding while the park was closed. Anyone with questions or concerns is encouraged to contact the City of Twin Falls Recreation Department at 208-736-2265.

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