ISDA is responding to a small number of quagga mussels detected in the Snake River. Visit Idaho.gov/Quagga for more information.

Invasive Species

Invasive species are harmful, non-native plants, animals and pathogens that damage our economy and environments.  Invasives can move into and dominate both natural and managed systems by disrupting the ability of those systems to function sustainably.  They are highly competitive, persistent, and can create monocultures that will eliminate Idaho’s diverse biological landscape—a landscape that nurtures Idahoan interests from our recreational pursuits to our ability to help feed the nation.    

Snake River Quagga Mussel Detection

The presence of invasive quagga mussels was confirmed in the Snake River near Twin Falls in the fall of 2023. 

September 24, 2024, ISDA confirmed the detection of quagga mussels in the Twin Falls area of the Snake River. Current monitoring results show a decrease of quagga mussel presence in the affected stretch of river since the pre-treatment surveys in 2023.  

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. Quagga mussels have the potential to destroy our waters and cost Idaho hundreds of millions of dollars in actual and indirect costs.  

In 2023 ISDA implemented a treatment of the river with a chelated copper product. It was the first treatment of this type and scale ever attempted in North America. Sampling results indicate the chelated copper treatment was effective in reducing the mussel population.   

Since the detection in 2023, ISDA has doubled quagga mussel sampling, ran more inspections stations, increased statewide communications, added manpower, and collaborated with more partners. The ISDA Invasive Species Program has more information and resources than ever before to combat this invasive species. 

ISDA is currently implementing a public access closure and mandatory inspection and decontamination of watercraft in certain stretches of the Mid-Snake River. These efforts are a part of a rapid response plan to minimize the potential movement of invasive quagga mussels. 

Please visit our Invasive Species of Idaho website for more information: IDAHO.GOV/QUAGGA

Questions about the Snake River?

(208) 332-8620

 

Hot Wash Information

1-877-336-8676

Media Inquiries

Sydney Kennedy

(208)986-1566

Idaho’s first line of defense against Aquatic Invasive Species

Checking Idaho waterways for invasive species like Quagga mussels

Visit the ISDA Invasive Species of Idaho website to learn more about our programs.

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