Being from oregon and having spent a ton of time on the west coast, as well as in the wis/mich area, I added my changes in blue. Reason are as follows.
Shasta and Crater Lake are kinda must-sees, so you did good there. However, southeastern oregon is desolate as all get out and southern idaho is as well. You're missing a great deal of the 101, which like I said before, is completely worth hitting up. Also, with my route, you get Portland, which is worth hitting for a multitude of reasons as well as the olympic peninsula, or at the very least, Seattle. Running across the top of Washington and northern idaho seems just better and nicer as far as a ride goes, and you absolutely cannot miss yellowstone. You just can't. The black line you made from where my first blue line starts and then returns to yours (southern oregon through idaho back to washington) just seems very oddly counterintuitive to me, as it will have you going through the most boring parts of all three states, IMO. Also, I've never made that run across the top of the country, but I know there's not a whole lot out there, so be prepared for miles upon miles of nothing at all. That being said, you also seem to have chosen the least interesting parts of Wisconsin, Iowa, Illinois, and Indiana, so I changed that too. The superior shoreline, as well as the UP seems a better option, and honestly, while wisconsin is magnitudes more interesting than Iowa, Illinois, and Indiana, you're not missing much scenery-wise by skipping it altogether. Plus you get chicago, the makinaw (ack?) bridge, and maybe a nice lake michigan drive back down to chicago. Oh, and maybe your paint skills are as good as mine, and that's why, but seriously don't miss new orleans. It's a bit of a shithole, but absolutely worth spending a night in. Just such an interesting city.
Any particular reason for your chosen west coast route? I've been out her all my life, and it seems weird....
