Mill Creek has a few decent bouldering problems that, while not worth a drive from out of town, provide a local with some thing to feed the need when driving to a crag or gym is impossible.
Not sure on the ratings and as far as I know no routes have been named.
UPDATE:the park does not allow climbing! So help us clean the area, and show them we are willing to up keep the area.
I believe there are more bouldering routes here than at the mills. The area needs cleaned,Team Homeless is working to open the area. We opened up and cleaned a few routes 10/21/06. This area is worth the drive, maybe crimpdaddy needs to look around a little bit more.