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Kelner points to a row of four Higgins' Eye mussels collected from the Mississippi River Tuesday. The Higgins' Eye mussel is a federally endangered species. Kelner is working to help rehabilitate its populations in the upper Mississippi. The corps' mussel survey this week will help determine how the future pool drawdown will affect not only the Higgins' Eye, but all mussel species.

Measuring Mississippi mussels

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The U.S. Army Corps of Engineers is conducting a mussel survey in the pool at Lock & Dam No. 3 this week and next week.

The survey is in preparation for a pool-wide drawdown, which will take place in the coming years, corps biologist Dan Kelner said. During the drawdown, the pool water level is reduced, allowing some native plants to regrow. However, the reduced water level can put native mussel populations at risk, Kelner said.

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Sarah Gorvin
Sarah Gorvin has been with the Republican Eagle for two years and covers education, business and crime and courts. She graduated from the University of Minnesota-Twin Cities in 2010 with a  journalism degree.
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