Thanks for that map, Richard. I clicked on your link and zoomed in on the mouth of the Columbia R and zeroed in on the WA side. Looks like one was found at the boat launch in Ilwaco, and other ones found at a couple of other spots along the shoreline and jetties. Actually, it looks like 3 - 5 were found at the boat launch over near the Coast Guard Station. The color code for the dots indicates only one snail found at each other spot, but it does indicated their presence. These could have arrive on waders, boots, maybe boats/trailers, shore birds or migrating water fowl, etc. I didn't see any locations "around the corner" in Willapa Bay, but I did see a couple dots on the Grays River, which I have fished in waders and felt soles, but not for 3 or 4 years. My guess is that we'll likely see them in Willapa Bay streams very shortly. I'll bet that they are already in the Naselle River. Its not that far from the Grays. Lots of fishers can hit each river system in the same day, if they want to.