(abbreviated '''I-84''') is an —roughly the same route as the
Oregon Trail . Starting in Portland, the interstate runs through the
Columbia River Gorge alongside the
Columbia River Highway to
The Dalles , then continues along the
Columbia River to
Boardman , at which point it veers off in a southeasterly direction, crosses the
Blue Mountains , and continues toward
Ontario at the
Idaho border.
Crossing the "heel" of the Idaho "boot", I-84 passes through
Boise , near
Twin Falls and through
Burley and
Rupert . East of Rupert it veers to the southeast and crosses the
Utah border. Within Utah I-84 passes through
Tremonton ,
Brigham City and
Ogden , terminating at I-80 in the mountains near Echo, Utah.
I-84 was known as until , branching off in Nebraska and going into Denver, was I-80S.) Federal law restricted the use of suffix letters on interstates, and these two were renumbered, as were some other highways that had E and W branches. The only remaining such split is
I-35E and
I-35W , which exists in the Dallas/Fort Worth area and the Minneapolis/St. Paul area.
Bolded cities are officially-designated
Control Cities for signs.
- After renumbering, I-84 violated the Interstate Highway Numbering Convention by being south of I-82.
- The Portland, Oregon segment of then-I-80N was proposed to run on the Mt. Hood Freeway . Plans for this were officially dropped in 1978 after a successful Freeway Revolt .
- In the Portland metro area, I-84 is usually referred to as the Banfield Freeway, though the official name is the Banfield Expressway. The freeway is named after Thomas H. Banfield, chairman of the Oregon Transportation Commission from 1943-1950
