I also saw a wolf on the south side of the freeway around mid May, it was standing in a small field just watching traffic, about 2-3miles west of tumwater as well. I would have turned around and got a pic if I didn't have the trailer and family with me. It was a grey one with a fairly whitish coat.
On a side note that was the second wolf I saw in one months time! There are really starting to populate I'm afraid!!!
Regards,
H&F