Biologists Found Zebra Mussels in Colorado River

The invasive species was confirmed in Utah waters following DNA testing and the discovery of live adults.

Updated on Oct. 8, 2026 in National Parks

A close-up shot of small, mottled zebra mussel shells clinging to a submerged piece of driftwood in clear river water. — Biologists confirmed the presence of invasive zebra mussels in Utah's Colorado River, threatening critical water infrastructure used by over one-third of the state's population. AI Illustration. Upload story photo >

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Biologists identified live adult zebra mussels near the Westwater Recreation Area in September 2026. Lab results confirmed the presence of the invasive species on Wednesday, October 7, 2026, following earlier water testing.

Why it matters

The presence of zebra mussels poses a significant threat to critical water infrastructure, which could lead to millions of dollars in damages. Over one-third of the Utah population relies on the Colorado River for their drinking water, making this a major public resource concern.

Testing identified zebra mussel DNA fragments in 4 of 22 water samples collected near the Potash Boat Ramp in June and July 2026. Utah currently manages 23% of the total water allocated to Upper Colorado River Basin states.

The details

The invasive mussels spread by attaching themselves to boats and other watercraft used in the river. Officials warn that the species is expected to clog critical pipes and water infrastructure throughout the region.

June 2026: DNA fragments were first identified during water testing.
July 2026: Additional water testing occurred.
September 2026: Biologists discovered live adult mussels.
Wednesday, October 7, 2026: Laboratory tests confirmed the presence of adult zebra mussels.

Travel Outlook

This discovery follows the destructive ecological patterns established by the Great Lakes zebra mussel infestation of the 1980s. The arrival of the species in Utah marks a significant and concerning expansion of the invasive mussels into the Colorado River basin.

Recreational boaters should expect increased inspections and stricter cleaning protocols at boat ramps to prevent further spread. Residents and businesses should prepare for potential long-term infrastructure maintenance costs related to water utility systems.

The takeaway

Invasive species like zebra mussels can cause rapid and expensive damage to essential public infrastructure. Communities should prioritize rigorous decontamination of all watercraft to help slow the spread of these organisms in the river system.