Columbia River Gorge and I-84 as seen from Crown Point, Oregon

Interstate 84 runs from an intersection with Interstate 5 at Portland, Oregon to an intersection with Interstate 80 at Echo, Utah —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 and Twin Falls, continuing on to the southeast and the border with Utah. Within Utah, I-84 connects Brigham City and Ogden, terminating at I-80 in the mountains near Echo, Utah.

I-84 was known as I-80N until the late 1970s. The western I-76 (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.

Length

Major cities along the route

• Portland, Oregon
• Boise, Idaho
• Ogden, Utah

Intersections with other Interstates

• Interstate 5 in Portland, Oregon
• Interstate 82 in Hermiston, Oregon
• Interstate 86 in Heyburn, Idaho
• Interstate 15 in Tremonton, Utah. They stay joined until Ogden, Utah.
• Interstate 80 in Echo, Utah

Spur routes

• Boise, Idaho - I-184

See also

• Interstate 84 (east)

Reference

• 2005 Rand McNally "The Road Atlas 2005"