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Southern region proposes hypolimnetic siphon for Pangewich Lake to curb algal blooms
Summary
Southern Region staff asked Blue Ribbon and Habitat councils for under $100,000 this fiscal year to buy materials for a proposed hypolimnetic siphon that would remove nutrient‑rich bottom water from Pangewich Lake to reduce harmful algal blooms and fish kills; project partners include DEQ and local irrigators but some maintenance and agreements remain to be finalized.
Southern Region fisheries staff asked joint Habitat Council and Blue Ribbon members to help fund the early phase of a hypolimnetic‑siphon project at Pangewich (Pangewich) Lake intended to remove nutrient‑rich bottom water and reduce summer harmful algal blooms and fish kills.
Nick Braithwaite, fisheries biologist for the Southern Region, said the siphon would draw denser, nutrient‑laden water from the hypolimnion and route it for irrigation use rather than releasing warmer surface water at the dam. He said the concept could reduce late‑summer algal blooms and compressive thermal stress that can cause fish mortality.
"We thought it…
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