Congressman Neguse, Senator Bennet, Senator Hickenlooper Call on DOI and USDA to Swiftly Address Invasive Zebra Mussels
Lafayette, CO — Today, Colorado Congressman Joe Neguse, joined by Senators Bennet and Hickenlooper, penned a letter to the Department of Interior (DOI) and the Department of Agriculture (USDA) requesting an update on the implementation of the Expanding Public Lands Outdoor Recreation Experiences (EXPLORE) Act, enacted last year. The lawmakers pointed to a specific provision of the law that provided additional authorities to the agencies to respond to and monitor aquatic invasive species. The lawmakers requested an update on these efforts after the Colorado River tested positive for invasive zebra mussels in July.
Read the full letter HERE and below.
Zebra mussels are an invasive species which can cause considerable and costly damage to water ecosystems and infrastructure, rapidly attaching themselves to infrastructure, blocking or interfering with water storage, treatment, and distribution systems. They can negatively impact local communities and economies by disrupting recreational activities, impacting ecosystems, and damaging water pipes, docks, boats, and more.
Congressman Neguse, who serves as founder and Co-Chair of the Congressional Colorado River Caucus, first took action to safeguard the state’s primary water source after Colorado Parks and Wildlife declared it “suspect” for zebra mussels. Alongside Senator Michael Bennet, he introduced the Stop the Spread of Invasive Mussels Act, which was then incorporated into the EXPLORE Act.
August 7, 2025
The Honorable Doug Burgum
Secretary
U.S. Department of the Interior
1849 C Street NW
Washington, D.C. 20240
The Honorable Brooke Rollins
Secretary
U.S. Department of Agriculture
1400 Independence Avenue SW
Washington, D.C. 20250
Dear Secretary Burgum and Secretary Rollins,
We write to request an update on the implementation of the Expanding Public Lands Outdoor Recreation Experiences (EXPLORE) Act, Public Law 118-234. In light of recent news that invasive zebra mussels have been found in the Colorado River and in other waterways in Western Colorado, we specifically request an update on your efforts to implement Section 128: Aquatic Resource Activities Assistance.
Invasive zebra mussels reproduce and spread quickly, often attaching to watercraft and moving quickly through different bodies of water. Zebra mussels are particularly dangerous for water infrastructure, as they can attach to, clog, or block water storage, treatment, and distribution systems–potentially causing millions of dollars of damage. Without natural predators, the mussels also damage ecosystems, which has led to the loss of larger fish in the Great Lakes and resultant declines in outdoor recreation and impacts to local economies.
Zebra mussels have recently been discovered in the Colorado River and other bodies of water along Colorado’s Western Slope, including Eagle County and outside of Grand Junction. More than 40 million people across seven states rely on the Colorado River Basin, and the spread of these invasive species into this critical body of water could have devastating impacts for many communities across the West.
The EXPLORE Act was signed into law in the 118th Congress, which included additional authorities for the Department of Interior (DOI) and U.S. Department of Agriculture (USDA) to respond to and monitor aquatic invasive species, including zebra mussels, and established a Vessel Inspection and Decontamination Station grant program for Reclamation States in Section 128: Aquatic Resource Activities Assistance. We understand the many pressures on your agencies, but request that you prioritize the implementation of these provisions in light of the threat facing our waterways and rivers in the West.
We request responses to the following questions by August 29, 2025:
- What is the status of implementation of Section 128 of Public Law 118-234, including the status of the Grant Program for Reclamation States outlined in Section 128 (c)? When do you anticipate fully implementing the authorities provided within Section 128?
- What actions have DOI and USDA taken to combat the spread of quagga and zebra mussels throughout our nation’s waterways?
- What agency resources have been allocated to address the threat of invasive mussels by DOI and USDA?
- Have DOI and USDA offered assistance to the State of Colorado to combat the spread of the invasive mussels?
Thank you for your prompt attention to this matter.
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