BYPASS Northern Utah Metro Salt Lake City complex, AND a much more pleasant drive.
In Wyoming, I-80 to a few miles past Green River, WY to Hwy 30 to Granger, Opal, Kremmer;
Then still on Hwy 30 to Bear Lake/Montpelier, Soda Springs, Lava Hot Springs to I-15 north.
I-15 north to Pocatello to I-86 on to Boise.