They don't list us on the map as having them but I just found this on the net that says they thrive in Lake Washington near Seattle and many other lakes and rivers here. I'll be looking for those castles they build now but since they are different then the ones found in other places around the continent maybe they don't build those mud homes here.
Crawfish thrive in Lake Washington
By
Mark Yuasa
Seattle Times staff reporter
Crawfish are a valued food commodity in Louisiana and clear across the Atlantic Ocean in Sweden.
But, what most people in the Pacific Northwest don't realize, is that a thriving wild and much larger species flourishes in the backyard of Seattle.
The bottoms of Lake Washington, and many other lakes and rivers in the state are filled with the tasty crustaceans.
Full report for those crawfish need to know peeps:
http://community.seattletimes.nwsource.com/archive/?date=20061010&slug=crawfish10