According to this article from The Oregonian, Oregon wildlife officials spotted a suspicious trailered boat being transported up the coast and contacted the Washington State Patrol to warn them to check it. Their concerns were well-warranted: it turns out the boat was from Missouri, and the inspection revealed zebra mussels (Dreissena polymorpha) encrusted under the engine. The boat was on its way to British Columbia...where the owners had also recently delivered yet another boat. This update from the Seattle Post Intelligencer notes that the infested boat was salvaged after it sank in a lake in the Midwest. It is odd that I cannot find any Canadian news sources covering this story - seems like it would be a big deal.