By Associated Press - Tuesday, October 27, 2015

BOZEMAN, Mont. (AP) - State biologists say they’re puzzled by the murky conditions of the upper Beaverhead River that has harmed fishing there.

The Bozeman Daily Chronicle ( ) reports the water has been clouded with fine sediments and some algae just below Clark Canyon Dam since mid-July.

Montana Fish, Wildlife and Parks water pollution biologist Trevor Selch says officials aren’t sure what’s going on and there is no memory of the phenomenon happening in the past.

State biologists have taken samples, studied possible causes and plan to discuss it during a Tuesday meeting in Dillon.

Regional fisheries biologist Matt Jaeger says one theory is that varying reservoir temperatures at different depths combined with warm and cool weather spells cause chemical reactions that help algae bloom and send sediment and dead algae into the river.


Information from: Bozeman Daily Chronicle,

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