Flambeau River Flowage Sediment Monitoring - NOR16_10


Sediment testing of the Flambeau River Flowages downstream from Park Falls in 1989 found high concentrations of mercury and heavy metals present. Twenty years have passed since this was done. In recent years the Flambeau Mine near Ladysmith has been operated and Dairyland Flowage upstream of Ladysmith was drawn down in 2008. Significant mercury concentrations were present in the Dairyland Flowage at the time of drawdown and may have been partially transported downstream. There are 7 flowages to assess (Upper P.F., Lower P.F., Pixley, Crowley, Big Falls, Dairyland, Ladysmith, Thornapple). A single core from the deepest spot in each flowage would be collected and partitioned into 4 segments. Samples would be tested for a range of metals and related parameters.


The objective is to update our knowledge of mercury and heavy metal contamination in the Flambeau River flowages. This information can be used to assess concerns related to future flowage drawdowns or other actions which could mobilize these contaminants.


A report will be produced.

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