• Zebra mussel larvae found in Colorado River and Government Highline Canal.
• Locations now considered “suspect” for presence of zebra mussels.
• Colorado Parks and Wildlife  initiating Rapid Response Plan.

July 17, 2024 — Colorado Parks and Wildlife (CPW)  announced yesterday the discovery of zebra mussel larvae, known as veligers, in the Colorado River and Government Highline Canal following routine testing in early July. While no adult mussels have been found, the detection of veligers means the locations are now considered “suspect” for the presence of zebra mussels.

CPW Director Jeff Davis acknowledged the “challenging discovery” and its potential ecological and economic impacts, stating, “CPW is committed to working with all of our partners as we work to better understand the extent of this discovery and the next steps in protecting the natural resources and infrastructure.”

Zebra mussels pose a significant threat to Colorado’s ecosystem. Their filter-feeding habits can negatively impact native fish populations by depleting essential food sources. Additionally, the mussels’ rapid reproduction and ability to attach to surfaces can clog water infrastructure, leading to long-term maintenance issues.

The Bureau of Reclamation and Grand Valley Water Users Association are collaborating with CPW to address the situation. Ed Warner, Area Manager for the Bureau of Reclamation, expressed disappointment but also optimism for partnership, saying, “We look forward to partnering with CPW, our stakeholders, and all involved to do what we can to address the situation.”

Tina Bergonzini, General Manager of the Grand Valley Water Users Association, called the news “devastating” and emphasized the potential impact on the entire Grand Valley. She stressed the importance of collaborative efforts to protect infrastructure, livelihoods, and water security.

CPW is urging boaters, paddlers, anglers, and others using Colorado’s waters to clean, drain, and dry their vessels and equipment after each use to help prevent the spread of zebra mussels. Signs will be posted at river access points from De Beque Canyon to the Loma Boat Ramp to alert the public about the river’s status. The future management of Highline Lake is under evaluation, and updates will be provided once decisions are made.

Image:

Zebra mussels dreissena polymorpha on native mussel, U.S. Fish and Wildlife Service, public domain.

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