I have arrived. Here is more mileage:

529 miles from Billings to Missoula because I took a few hours through or near Yellowstone.
463 miles from Missoula to Issaquah. It didn't take nearly as long as I was told, so I continued on instead of staying in Spokane for the night.

I posted some more pictures. We went to the Columbia River gorge. I think that Bucky, the intrepid canine, enjoyed this stop. The previous day we (I, I don't think that the dog was paying attention although sometimes she would get up to look out the window) saw some beautiful scenery in Yellowstone. I could see Mt Rainier but the pictures I took don't do it justice. Here is the Olympic range from a distance and the inevitable rain once we enter the mountain pass. Pretty cool all the way around. Today Joe and I will drive to the Olympic peninsula for some camping with Tracy and a friend. Bucky knows the camping routine. Here are a few more pictures from Yellowstone.