Originally Posted by ChileRick
Of all of the routes you've suggested, we've taken all of them, and we'd opt for the I-15 thru Utah. Don't know about getting to the I-15 from Oregon though, never have done that.
I5 to 89/44 to 395 to I80 to I15.
I5 to 140 to 395 to I80 to I15 (or 95)
Been both routes, nice scenery but if you go in winter can have snow/ice problems.
I5 to I80 to I15, good winter travel.
You could also consider using 95 in Nev to Las Vegas to I15, 95 isn't a bad road (2 lane though), a little boring, but lots of straight areas, easy to drive.
Guess it depends on where your final destination is.