This is a continuation of the posts I wrote during or immediately after my trip from Portland, Oregon to Roslyn and Spokane, Washington and return:
Here was the initial route: I followed Highway 84 from Portland to Biggs, following the Oregon side of the Columbia River. Here is a photo I found from the web showing the Biggs crossing to the Washington side:
The route I followed is shown below. This is the Portland-to-Cle Elum/Roslyn segment of the trip. You can click this map for a larger image. If I recall I completed this run in about 4 1/2 hours.