Interstate 84 (west)

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Interstate 84 runs from an intersection with Interstate 5 at Portland, Oregon (Map) to an intersection with Interstate 80 (Map) 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, 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 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.

Contents 1 Length 1.1 Major cities along the route 2 Intersections with other Interstates 3 Spur routes 4 Trivia 5 See also 6 Reference

Length

Miles	km	state
375	608	Oregon
276	447	Idaho
119	193	Utah
770	1247	Total

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

	edit Three-digit Interstates from Interstate 84
I-184	Interstate 184

Trivia

• 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.

See also

• Interstate 84 (east)

edit Primary Interstate Highways
4	5	8	10	12	15	16	17
19	20	22	24	25	26	27	29
30	35	37	39	40	43	44	45
49	55	57	59	64	65	66	68
69	70	71	72	73	74	75	76 (W)
76 (E)	77	78	79	80	81	82	83
84 (W)	84 (E)	85	86 (W)	86 (E)	87	88 (W)	88 (E)
89	90	91	93	94	95	96	97
99	238	H-1	H-2	H-3
Unsigned Interstate Highways
A-1	A-2	A-3	A-4	PRI-1	PRI-2	PRI-3
Lists Two-digit Interstates - Three-digit Interstates Gaps in Interstates - Intrastate Interstates Interstate standards - Proposed Interstates

Reference

• 2005 Rand McNally "The Road Atlas 2005"