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Adult zebra mussels found in Colorado River, which is now designated “infested”

A hand holding a rock with a zebra mussel on it.
Colorado Parks and Wildlife
Adult zebra mussel on a rock. Colorado Parks and Wildlife confirmed the presence of adult zebra mussels, a rapidly spreading invasive species, in the Colorado River in September 2025.

Adult zebra mussels have been found in the Colorado River and a nearby lake in Grand Junction, Colorado Parks and Wildlife said Monday.

The agency has detected the invasive species in its larval stage, called a veliger, in past sampling efforts in the river and nearby lakes. This is the first time an adult zebra mussel, a sign of a more established population, has been found in the Colorado River in Colorado.

“While this is news we never wanted to hear, we knew this was a possibility since we began finding veligers in the river,” CPW Director Jeff Davis said in the news release. “I can’t reiterate this enough. It was because we have a group of individuals dedicated to protecting Colorado’s water resources that these detections were made.”

Read the full story here

Shannon Mullane writes about the Colorado River Basin and Western water issues for The Colorado Sun. She frequently covers water news related to Western tribes, Western Slope and Colorado with an eye on issues related to resource management, the environment and equity.