A wake boat traveling from Minnesota to Georgetown Lake near Anaconda was stopped at a Montana inspection station after aquatic invasive species inspectors discovered hundreds of zebra mussels attached to the vessel, state wildlife officials announced. The interception prevented what authorities say could have been a catastrophic introduction of the invasive species into one of southwest Montana’s most popular recreational lakes.
What Inspectors Found
Inspectors at the Anaconda boat check station flagged the Minnesota-registered wake boat and found mussels in multiple locations — some clinging directly to the hull, others attached to fragments of Eurasian watermilfoil caught on the trailer. The boat also had ballast tanks, a design feature common to wake boats that prevents complete drainage of water between uses.
The vessel had been out of the water for four days before the stop. That detail matters, because zebra mussels can survive out of water for up to 30 days, meaning the mussels discovered on the boat were still viable and capable of establishing a new population if the boat had been launched.
The boater told inspectors he had no idea he was transporting the mussels. After inspectors completed a decontamination of the vessel, Montana Fish, Wildlife & Parks wardens responded to the scene and the boat was locked to its trailer to prevent any launch.
Why the Intercept Matters
Montana FWP aquatic invasive species bureau chief Tom Woolf was direct about the stakes involved. “Boats like this can ruin Montana’s waters forever,” he said. “This is the boat that would introduce mussels.”
Zebra mussels, native to Eastern Europe, have spread aggressively through the Great Lakes and into inland waterways across the Midwest. Once established in a water body, they are essentially impossible to eradicate. The mussels reproduce rapidly, filter enormous volumes of water in ways that disrupt native food webs, and colonize hard surfaces including intake pipes, boat engines, docks, and shoreline rocks — causing both ecological and infrastructure damage that can run into the millions of dollars annually.
Georgetown Lake, a reservoir situated in the Pintler Mountains west of Anaconda, is a heavily used fishery and recreation area. An introduction of zebra mussels there would threaten not only the lake itself but potentially downstream waterways in the Clark Fork drainage.
Montana’s Inspection Requirements
Under state law, all watercraft entering Montana must pass through an aquatic invasive species inspection. Boats equipped with ballast tanks or bladder systems face an additional requirement: they must be decontaminated before they are permitted to launch on any Montana water body. Wake boats, which use ballast systems to create larger waves for water sports, have become a growing concern for invasive species managers because those tanks can retain standing water — and whatever organisms may be living in it — long after a boat leaves an infested lake.
FWP operates check stations at key entry points across the state during the boating season and has intercepted multiple mussel-fouled vessels in recent years. State officials have repeatedly credited the inspection network with keeping zebra and quagga mussels out of Montana waters, even as the species have reached lakes and rivers increasingly close to the state’s borders.
What Happens Next
The boat remained locked to its trailer following decontamination pending further review by FWP wardens. Officials did not specify whether any citation was issued to the boater, but state law authorizes penalties for transporting aquatic invasive species.
FWP continues to urge anyone transporting a watercraft into Montana — especially vessels coming from mussel-positive states in the Midwest — to drain all water from bilges, live wells, and ballast systems before leaving any body of water and to contact the nearest inspection station before launching. A list of check station locations is available through the Montana FWP website.
With the peak of summer boating season underway, officials say vigilance at inspection stations is at its highest — and that stops like the one in Anaconda are exactly the reason Montana’s waterways have so far remained free of established mussel populations.
