Routing Help WO to CO

[BobAin'tStoppin']

It's winter, and time to plan next summers travel. I'm looking to go south from Rock Springs, Wyoming into Colorado. Google maps is suggesting route 430/10N/318 will get me down to route 40. I'm a little suspicious on this. Can anyone advise if this is all paved roads?

Thanks for any help.

ps: I've done the route 191 down to Vernal before, and am looking for something new. But if this is the best way, I need to consider it.