NOR_02_08 - Chetek River & Chetek Chain of Lakes Diurnal DO and problematic algae bloom monitoring


1.conduct diurnal D.O. and temperature monitoring on the Chetek River between Hwy 53 and its confluence with the Red Cedar River to determine the frequency and duration of standards violations below the 3mg/l D.O. standard during late July and August. 2. Collect weekly blue green algae samples on the Chetek River near the campground on the west side of Hwy 53 to document species present as well as density and toxin production if problem blooms merit closer scrutiny July 15th to August 30th. 3. Collect weekly water chemistry samples at least 4 out of the 6 weeks when problem bloom periods occur to assess contributions of suspended solids, B.O.D., Total Phosphorus, Nitrate+Nitrite, Total kjeldahl \0096 N, Ammonia July 15th to August 30th from the Chetek Chain of Lakes to the Chetek River.


It is necessary to properly document the kind and severity of the limiting factors which may be keeping the Chetek River and downstream receiving waters from meeting their full biological potential as required by the clean water act. These efforts also mesh closely with at least one of the four main goals identified within the Department’s Strategic Plan (Goal #2 Sustaining Ecosystems) and also closely meshes with at least 2 of the 4 main goals for the Water Division (Goal #1;To protect the waters of the state that are held in trust for all people of the state through enforcement of the public trust doctrine & Goal #2 to fully implement the Clean Water Act in order insure a water body is meeting its full biological potential including Endangered, Threatened, and Rare species which are often intolerant of pollution and low D.O.).


Collect weekly water chemistry samples and conduct continuous D.O. monitoring during the period when aquatic plants are senescing within the Chetek Chain of Lakes and nutrients released from tissues begin to drive dangerous blue green algae blooms which can be concentrated in flows over the dam depending upon wind direction. These contributions are likely the dominate limiting factor for the Chetek River and are likely to still exert a strong influence on the Red Cedar River (one of the states best warm water riverine fisheries). A report will be completed summarizing annual data interpretation and recommended future monitoring and potential management implications to insure the Chetek River is fully meeting its biological potential.

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