Michael,
Your mystery critter sure sounds like a rubber boa. The dimensions,
shape, range, and behavior fit pretty well. Colors are pretty variable,
and the young in particular can be pink. I also wonder about the quality
of the light under which you saw it. You might check Reptiles of
Washington and Oregon by Storm et al. You're within the range of the
critter, but they don't usually appear in developed areas. If you're on the
edge of town, that makes it more likely. They are hard to find unless you
turn over rocks and logs.

The only blindworms I know of aren't known from here. I don't know
where they are native, but they have been introduced to Hawaii. They
are much smaller than a nightcrawler. Most worms in built-up areas of
North America are introduced. East of the Rockies, almost all are
introduced. In some areas, substantial changes in soil characteristics
have been blamed on them. It's a good thing they don't grab toes or we'd
have an entirely different view of going barefoot.

John Fleckenstein
Natural Heritage Program
Washington Department of Natural Resources
John.Fleckenstein at wadnr.gov