Just moved to Mercer Island, WA from CT. I saw some BMW bikes on the road today and figured I should pop in and see what the ADV forums out here are like. This trip sounds like it would be pretty awesome. I've never seen any of the country between WI and WA and am really looking forward to seeing it. I'm hoping to find places as beautiful as CO that's a closer bike trip.
I'm not familiar with the weather though, what's to be expected as far as snow riding goes? I've never ridden on snow with 2 wheels.