BOISE, Idaho — The Idaho State Department of Agriculture (ISDA) announced Friday that the quagga mussel impact area of the Snake River was reduced by 51%.

ISDA referenced its extensive sampling, which the department says showed significant progress in controlling the infestation. ISDA said it conducted over 450 samples in the infested area of the Snake River and more than 4,514 statewide.

The impacted area now spans approximately 3.5 river miles, down from 7.2 miles in 2024, according to the department.

No quagga mussels have been detected upstream or downstream of the 2024 treatment zone, and none have been found in nearby reservoirs that serve Magic Valley irrigators, per the the Idaho State Department of Agriculture.

"Quagga mussels pose a serious threat to Idaho's water infrastruct

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