We'll be heading South on I-15 thru ID., heading to Vernal Utah, GS Trip Planner wants to take me on I-84 near South Ogden to US 40, 310.5 mi,5.0 hours, Google Maps takes me to I-80 at South Salt Lake...
just south of pocatello at McCammon take hiway 30 east, it comes out at little america ,excellent road all the truckers us it to miss salt lake. take 191 just before rock spring through the flaming gorge to vernal