On Tuesday, August 6th, I was driving from South Bend WA to Olympia. I noticed what I first believed to be a cloud formation to my north. As I got closer, it appeared to be a contrail. No other clouds or contrails were in the area. What got my attention was the trail seemed to be made of large clouds with even spaces between. I remember there were contrails thought to be caused by secert aircraft, namely the Arora. The contrail ran east to west from Grays Harbor to the Sound. The trail lasted at least two hours from before 6:00 p.m. till after 8:30 p.m.