Washington on guard for troublesome mussel found in Idaho last year

Quagga mussels from Lake Mead, in Nevada. Washington officials are monitoring waterways in their state after the invasive species was detected in Idaho in 2023. (Dave Britton/U.S. Fish and Wildlife Service)

Washington is upping efforts to keep an invasive freshwater mussel from gaining a shell-hold in the state’s rivers and lakes, using tactics ranging from DNA testing to shellfish-sniffing dogs.

Quagga mussels can cause major problems as layers of them crust over components of hydroelectric dams and locks, or clog drinking water or irrigation systems. Fisheries and fish ladders that allow salmon to bypass dams could be disrupted, too. The mussels can also outcompete native species, throw off water quality, and otherwise degrade ecosystems.

They were found last year in Idaho , stoking new worries about their threat to the region.

Snake River quagga mussel monitoring is an ongoing effort, state officials say

Washington’s Invasive Species Council cites estimates that it will cost $100 million annually to keep the state’s power and water infrastructure running if quagga mussels or non-native zebra mussels were to invade. That amount doesn’t factor in the cost of harm to habitat or fishing.

Even taking the potential problems for dams out of the equation, Justin Bush, aquatic invasive species policy coordinator at the state’s Department of Fish and Wildlife, said the mussels would have “a devastating, catastrophic impact to our environment and our economy.”

The Columbia River Basin for years has been the last major U.S. watershed free of the invasive mussels. But last September, Idaho officials said they’d detected quagga mussels near Twin Falls in the Snake River, which runs into the Columbia.

Starting July 1, new Idaho laws took effect to combat the aquatic invasive species. Changes to the Idaho law include mandatory inspection and decontamination for out of state watercraft, requirements for removing drain plugs and new requirements for local watercraft inspection stations.

The Idaho State Department of Agriculture operates a hotline (1-877-336-8676) for anyone needing information or a free decontamination wash for watercraft that may have been in mussel-infested waters. For more information on the department’s Invasive Species Program, including inspection station locations and program activities, visit invasivespecies.idaho.gov .

Invasive species stickers can be purchased from the Idaho Department of Parks and Recreation at parksandrecreation.idaho.gov/activities/sailing/invasive-species-program /.

The new law requires all out of state watercraft must be inspected and decontaminated at a watercraft inspection station prior to launch, according to a press release from the Idaho State Department of Agriculture. Before launching in Idaho, a nonresident watercraft owner must also purchase an invasive species sticker. In Idaho, a conveyance or watercraft includes but is not limited to a boat, kayak, paddleboard, inflatable watercraft, sailboat, trailer or any other means or method of water transportation.

“Before transporting any watercraft, operators must remove the drain plug and drain all water, including all internal compartments, such as ballasts, bilges, live wells and motors,” the press release said.  “All bilge and ballast plugs and other barriers that prevent water drainage from a conveyance must be removed and remain open while a watercraft is transported by land within the state.”

Funding is now available for Idaho counties, cities or other local entities for equipment and supply costs necessary for the operation of watercraft inspection stations, the press release said.

So what’s to be done in Washington? The Department of Fish and Wildlife has some new money to deal with the shellfish. The Legislature approved $1.81 million for the fiscal year that begins July 1 to combat invasive mussels and the Army Corps of Engineers is providing an equal sum, for a total of $3.6 million.

“We’re significantly increasing efforts,” Bush said this week during a meeting of the Invasive Species Council.

Monitoring for quagga mussels

The main way the mussels tend to spread is on recreational boats moved between bodies of water. When grown, they’re 1 to 2 inches and easy to spot but larvae, known as veligers, are microscopic.

Fish and Wildlife wants to fully staff watercraft inspection stations, Bush told the council.

The agency is turning to a variety of techniques to detect mussels in the water. These include measuring calcium levels (the bivalves rely on calcium to build their shells), using a grabber device to pull up and check material from lakebeds, and looking for traces of mussel DNA.

Bush said the department will also add a monitoring crew to three two-person crews it has had.

And he said the department is looking to bring on another mussel-sniffing dog. The dog would join Fin, a canine already doing this work. Puddles , a dog that had been, is retired, Bush said.

More public outreach is also planned to remind people to clean, drain, and dry boats and other gear that’s been in the water and could spread the mussels.

It’s unclear if Idaho’s attempt last year to kill quagga mussels in the Snake River worked. The $3 million project involved treating a 16-mile stretch of the river with a copper-based chemical to kill the mussels. There was collateral damage as thousands of fish died, too.

Idaho Department of Agriculture Director Chanel Tewalt told state lawmakers that it was the largest operation of its kind ever attempted in the U.S.

“Since Idaho’s Legislature took action in 2008, our state has taken the forefront in combating aquatic invasive species,” Tewalt said in a July 1 press release referencing Idaho’s new law changes. “Today, Idaho adds additional tools in our fight to protect agriculture, power generation, recreation and private property.”

Along with zebra mussels, quagga mussels were first documented in the U.S. in the 1980s in the Great Lakes, having made it there in the ballast water of ships. They’ve spread since.

In addition to detection and monitoring, Washington Fish and Wildlife officials are also preparing to respond if the mussels aren’t stopped and become a fixture in state waters.

“We’re planning for the very worst, but we’re hoping that Idaho was successful in eradicating this problem,” said Bush.

Idaho Capital Sun editor-in-chief Christina Lords contributed to this report.

Washington State Standard , like the Idaho Capital Sun, is part of States Newsroom, a nonprofit news network supported by grants and a coalition of donors as a 501c(3) public charity. Washington State Standard maintains editorial independence. Contact Editor Bill Lucia for questions: info@washingtonstatestandard.com . Follow Washington State Standard on Facebook and X .

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