Success at last! This was my third attempt at the Palouse to Cascades state park trail. The trail runs for ~300 miles from Cedar Falls (near north bend) all the way to the border with Idaho (near Tekoa). This trail is a beast - but after three attempts, I finally made it.
Before I jump into this trip, a bit of history. There is a bridge that goes over I-90 as you are going east from Seattle.