Zebra mussels on Marimo moss balls are causing an emergency in WA If the tiny mussel established itself here, it would create over $100 million worth of damage each year to dams, agriculture, salmon and more. by Updated at 11:05 a.m. on March 8, 2021 Participants in the Lake Roosevelt Invasive Mussel Response Exercise in the fall of 2019 deploy mock chemicals into the water. (Washington State Depaartment of Fish and Wildlife/Washington Invasive Species Council.) Capt. Eric Anderson of the Washington State Department of Fish and Wildlife was driving down Highway 101 at 1:30 p.m. Tuesday, when the computer terminal in his car blinked on. His Montana counterpart, Tom Wolfe, had forwarded him an email with an innocuous automated report from the U.S. Geographic Survey about the detection of a zebra mussel in Washington state.