I'm not 100% sure but those look like roundworms to me. Roundworms are fairly common, and are zoonotic.
I'll send the link over to my friend who's a vet and get his $.02.
I would have taken a few samples to send to the CDC or the state veterinarian.
Or, maybe the WDFW biologists would be interested in it.
Thanks for posting the picture! Very interesting.
Kurt