a threat to idaho

In September of 2023, the Idaho State Department of Agriculture confirmed the presence of quagga mussel veligers in the Mid-Snake River. The discovery of quagga mussel veligers in the Snake River marked the first time a rapid response plan had been put into action for quagga mussels in Idaho.

ISDA has closely monitored the Snake River since the initial detections, taking more than 300 samples in the affected area throughout 2024. September 24, 2024, ISDA confirmed the detection of a small number of quagga mussels in the Twin Falls area of the Snake River. Current sample results show a decreased quagga mussel presence in the affected stretch of river since pre-treatment in 2023. More information on the recent detection and response HERE.

The introduction of quagga mussels poses a major threat to Idaho. This invasive species can quickly spread and clog pipes that deliver water for drinking, energy, agriculture, recreation, and a variety of other uses. These mussels can negatively affect fish populations and wildlife habitat. 

The mussels are highly competitive, persistent, and can create monocultures that will eliminate Idaho's diverse biological landscape. If left untreated, a quagga mussel infestation has the potential to cost Idaho hundreds of millions of dollars in actual and indirect costs. This would affect every irrigator, power user, and recreator.    

Quagga mussels are primarily spread through human activities and have been done so unintentionally. Increased, travel, trade and tourism have contributed to the movement of quagga mussels across oceans and inter-state waterbodies; some species find their way accidentally by hitching a ride in, ballast tanks, inflatable watercrafts, cargo, or any items that come into contact with infested water.