April 27, 2026 — The U.S. state of Washington is taking emergency action to reclassify golden mussels as a Prohibited Level 1 invasive species following the discovery of the species in Oregon earlier in the month.
Originally from China and Southeast Asia, golden mussels are an invasive species in the U.S. that are known to cause damage to infrastructure and reduce water quality, harming local fishing operations. The species was first detected in California in 2024, but a second instance was detected in Oregon in April 2026. According to the Oregon Department of Fish and Wildlife (ODFW), a watercraft was intercepted at the Ashland Boat Inspection Station carrying golden mussels.