Interstate 84 (I-84) is an

Interstate Highway The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. T ...

in the

northwestern United States The Northwestern United States, also known as the American Northwest or simply the Northwest, is an informal geographic region of the United States. The region consistently includes the states of Oregon, Washington, Idaho, Montana and Wyoming. ...

. The highway runs from

Portland, Oregon Portland (, ) is a port city in the Pacific Northwest and the largest city in the U.S. state of Oregon. Situated at the confluence of the Willamette and Columbia rivers, Portland is the county seat of Multnomah County, the most populous ...

, to a junction with

I-80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from downtown San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one o ...

near

Echo, Utah Echo is a census-designated place located in northwestern Summit County, Utah, United States. The population was 56 at the 2010 census. Echo was founded in 1854. The community took its name from nearby Echo Canyon. History Echo originated as a ...

. The highway serves and connects Portland,

Boise Boise (, , ) is the capital and most populous city of the U.S. state of Idaho and is the county seat of Ada County. On the Boise River in southwestern Idaho, it is east of the Oregon border and north of the Nevada border. The downtown area' ...

, and

Ogden, Utah Ogden is a city in and the county seat of Weber County, Utah, United States, approximately east of the Great Salt Lake and north of Salt Lake City. The population was 87,321 in 2020, according to the US Census Bureau, making it Utah's eighth ...

. With connections to other highways, I-84 connects these cities to points east and also serves as part of a corridor between

Seattle Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest region o ...

and

Salt Lake City Salt Lake City (often shortened to Salt Lake and abbreviated as SLC) is the capital and most populous city of Utah, United States. It is the seat of Salt Lake County, the most populous county in Utah. With a population of 200,133 in 2020, th ...

. The sections running through Oregon and Idaho are also known as the Vietnam Veterans Memorial Highway."" The highway originally served as a fork of I-80 to serve the

Pacific Northwest The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Thou ...

, and was originally numbered Interstate 80N. It was generally built along the corridor of U.S. Route 30 (US 30) and US 30S, which themselves largely followed the

Oregon Trail The Oregon Trail was a east–west, large-wheeled wagon route and emigrant trail in the United States that connected the Missouri River to valleys in Oregon. The eastern part of the Oregon Trail spanned part of what is now the state of Kans ...

; the US 30S designation was decommissioned in the 1970s after the freeway replacement was mostly complete. The highway was signed with the I-84 designation in 1980, when a 1977 change in guidelines took effect that discouraged highway numbers with directional suffixes. The renumbering resulted in two highways being numbered I-84, with the other located in the

Northeastern United States The Northeastern United States, also referred to as the Northeast, the East Coast, or the American Northeast, is a geographic region of the United States. It is located on the Atlantic coast of North America, with Canada to its north, the Southe ...

Route description

, - , , , - , , , - , , , - , Total ,

Oregon

In the

Portland metropolitan area The Portland metropolitan area is a metro area in the U.S. states of Oregon and Washington centered on the principal city of Portland, Oregon. The U.S. Office of Management and Budget (OMB) identifies it as the Portland–Vancouver–Hillsboro, ...

, I-84 is sometimes referred to as the "Banfield Freeway" or simply "the Banfield", although the official name is the Banfield Expressway. This freeway is named after Thomas H. "Harry" Banfield (1885–1950), the chairman of the Oregon Transportation Commission from 1943 to 1950. As I-84 heads east, it also follows US 30 in a majority of I-84 from Portland, Oregon, to near Rupert, Idaho, with splits being variant in Oregon and Idaho, but before leaving Portland, there is a junction with

I-205 Interstate 205 may refer to either of two unconnected Interstate Highways in the United States, both of which are related to Interstate 5 * Interstate 205 (California), a connector in the San Francisco Bay Area * Interstate 205 (Oregon–Washin ...

, along with cities Gresham, Fairview, Wood Village and Troutdale . I-84 ColumbiaR

Immediately after leaving Troutdale, I-84 and US 30 runs east along the south bank of the

Columbia River The Columbia River ( Upper Chinook: ' or '; Sahaptin: ''Nch’i-Wàna'' or ''Nchi wana''; Sinixt dialect'' '') is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia ...

(and the northern Oregon border, as well) for nearly with the first 80 miles being in the Columbia River Gorge National Scenic Area, running from Troutdale to nearby Biggs Junction, passing through the cities of Hood River and The Dalles in the Scenic Area. It also passes through Biggs Junction, Arlington, and Boardman outside of the Scenic Area before heading southeast to the junction with southern end of

I-82 Interstate 82 (I-82) is an Interstate Highway in the Pacific Northwest region of the United States that travels through parts of Washington and Oregon. It runs from its northwestern terminus at I-90 in Ellensburg, Washington, to its southeast ...

immediately southeast of the

Umatilla Chemical Depot The Umatilla Chemical Depot, (UMCD) based in Umatilla, Oregon, was a U.S. Army installation in the United States that stored chemical weapons. The chemical weapons originally stored at the depot consisted of various live munitions and storage co ...

near Hermiston. From the junction it continues southeast on to Pendleton. East of Pendleton, I-84 climbs Emigrant Hill, a 6% grade, into the Blue Mountains. The westbound lanes switchback twice on its descent into Pendleton. Eastbound lanes feature the tightest curves allowed on the Interstate Highway system, even though those curves are on the uphill (eastbound) direction. This grade is also well known because of the distance between eastbound and westbound lanes, nearly between the opposite directions of travel at some points. The road summits at

above sea level Height above mean sea level is a measure of the vertical distance ( height, elevation or altitude) of a location in reference to a historic mean sea level taken as a vertical datum. In geodesy, it is formalized as '' orthometric heights''. Th ...

before descending to the Grand Ronde River and La Grande. It passes by North Powder and

Baker City Baker City is a city in and the county seat of Baker County, Oregon, United States. It was named after Edward D. Baker, the only U.S. Senator ever killed in military combat. The population was 10,099 at the time of the 2020 census. History Pla ...

and through the Burnt River canyon. Around Huntington, it crosses into the

Mountain Time Zone The Mountain Time Zone of North America keeps time by subtracting seven hours from Coordinated Universal Time (UTC) when standard time ( UTC−07:00) is in effect, and by subtracting six hours during daylight saving time ( UTC−06:00). The clo ...

then briefly follows the southwest bank of the

Snake River The Snake River is a major river of the greater Pacific Northwest region in the United States. At long, it is the largest tributary of the Columbia River, in turn, the largest North American river that empties into the Pacific Ocean. The Snake ...

( Brownlee Reservoir), then continues to

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central Ca ...

before crossing the Snake River into

Idaho Idaho ( ) is a U.S. state, state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Monta ...

. On March 1, 2016, the speed limit from The Dalles to Ontario was raised to , while the truck speed was raised to .

Idaho

I-84 enters Idaho by crossing the

, Oregon. From there, it continues on to the major cities of the Treasure Valley (or

Boise metropolitan area The Boise–Nampa, Idaho Metropolitan Statistical Area (MSA) (commonly known as the Boise Metropolitan Area or the Treasure Valley) is an area that encompasses Ada, Boise, Canyon, Gem, and Owyhee counties in southwestern Idaho, anchored by the ...

) including

Caldwell Caldwell may refer to: People * Caldwell (surname) * Caldwell (given name) * Caldwell First Nation, a federally recognized Indian band in southern Ontario, Canada Places Great Britain * Caldwell, Derbyshire, a hamlet * Caldwell, Eas ...

Nampa The Namibia Press Agency (NAMPA) is the national news agency of the Republic of Namibia. It was founded in 1987 under the name Namibia Press Association as a SWAPO partisan press agency, and resuscitated after independence under its current name ...

, Meridian, and

(where

I-184 Interstate 184 (I-184) is a short auxiliary Interstate Highway in Boise, Idaho, United States. It is a spur route of I-84 that connects the freeway to Downtown Boise, terminating at US Highway 20 (US 20) and US 26. Rout ...

connects travelers to downtown). From Boise, I-84 continues southeast passing near several small cities ( Mountain Home, Glenns Ferry, and

Jerome Jerome (; la, Eusebius Sophronius Hieronymus; grc-gre, Εὐσέβιος Σωφρόνιος Ἱερώνυμος; – 30 September 420), also known as Jerome of Stridon, was a Christian priest, confessor, theologian, and historian; he is co ...

) on its way to Twin Falls. Just east of Jerome, I-84 passes within of Twin Falls, but does not cross the Snake River Canyon or into Twin Falls County. Access to Twin Falls is afforded by an intersection with US 93 at Exit 173; US 93 southbound crosses the Snake River via the Perrine Bridge. After Twin Falls, I-84 continues through Burley and Heyburn. Approximately east of Declo in rural Cassia County, I-84 meets the western terminus of the western section of

I-86 Interstate 86 may refer to any of three unconnected Interstate Highways in the United States: * Interstate 86 (Pennsylvania–New York) * Interstate 86 (Idaho) * Interstate 84 (Pennsylvania–Massachusetts) Interstate 84 (I-84) is an I ...

. While I-86, along with US 30 heads east, then northeast to

American Falls The American Falls is the second-largest of the three waterfalls that together are known as Niagara Falls on the Niagara River along the Canada–U.S. border. Unlike the much larger Horseshoe Falls, of which approximately 90% is in Ontari ...

and Pocatello (following the

), I-84 heads southeast to the border with

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its ...

. In 2014, the speed limit on rural sections of I-84 in Idaho was raised to .

Utah

From Idaho, I-84 enters Utah at a point approximately 7 miles (11.3 km) from Snowville in

Box Elder County Box Elder County is a county at the northwestern corner of Utah, United States. As of 2018, the estimated population is 54,950. Its county seat and largest city is Brigham City. The county was named for the box elder trees that abound in the c ...

. It proceeds southeast through Rattle Snake Pass towards

Brigham City Brigham City is a city in Box Elder County, Utah, United States. The population was 17,899 at the 2010 census. It is the county seat of Box Elder County. It lies on the western slope of the Wellsville Mountains, a branch of the Wasatch Range ...

where I-84 joins

I-15 I15 may refer to: * Interstate 15, a north–south Interstate Highway in the United States of America * Polikarpov I-15, a Soviet fighter aircraft * I15 (band) "Soulja Girl" is the second single from American rapper Soulja Boy's studio album '' ...

(just west of Tremonton) for its next . I-84atEcho

Just north of Brigham City, at

Corinne, Utah Corinne ( ) is a town in Box Elder County, Utah, United States. The population was 685 at the 2010 census. Geography Corinne is located in southeastern Box Elder County, on the west side of the Bear River. It is the last town on the river bef ...

, I-84 joins the route of the

First transcontinental railroad North America's first transcontinental railroad (known originally as the "Pacific Railroad" and later as the " Overland Route") was a continuous railroad line constructed between 1863 and 1869 that connected the existing eastern U.S. rail netwo ...

which the highway follows to its terminus. I-15/I-84 heads south to the cities of the Wasatch Front (Or the Ogden-Clearfield Utah Metropolitan part) passing through several smaller communities and then the west side of Ogden before I-84 separates towards Cheyenne, Wyoming, while I-15 heads to Salt Lake City, I-84 follows the

Weber River The Weber River ( ) is a long river of northern Utah, United States. It begins in the northwest of the Uinta Mountains and empties into the Great Salt Lake. The Weber River was named for American fur trapper John Henry Weber. The Weber River ...

east. As the freeway gradually ascends through Weber Canyon it also passes through several small farming communities, including

Morgan Morgan may refer to: People and fictional characters * Morgan (given name), including a list of people and fictional characters * Morgan le Fay, a powerful witch in Arthurian legend * Morgan (surname), a surname of Welsh origin * Morgan (singer ...

, where the

Browning Arms Company Browning Arms Company (originally John Moses and Matthew Sandefur Browning Company) is an American marketer of firearms and fishing gear. The company was founded in Ogden, Utah, in 1878 by brothers John Moses Browning (1855–1926) and M ...

headquarters can be seen from the freeway. Also visible in the canyon is Devil's Slide, an unusual rock formation just off the freeway. Farther up the canyon is the Thousand Mile Tree, planted by

Union Pacific Railroad The Union Pacific Railroad , legally Union Pacific Railroad Company and often called simply Union Pacific, is a freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Paci ...

workers to mark from the railroad's origin in

Omaha, Nebraska Omaha ( ) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County. Omaha is in the Midwestern United States on the Missouri River, about north of the mouth of the Platte River. The nation's 39th-largest ...

. The freeway ends at

Echo In audio signal processing and acoustics, an echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the lis ...

, a near ghost town that before served as a stopover for the railroad, at a junction with

Interstate 80 Interstate 80 (I-80) is an east–west transcontinental freeway that crosses the United States from downtown San Francisco, California, to Teaneck, New Jersey, in the New York metropolitan area. The highway was designated in 1956 as one ...

, to Cheyenne, Wyoming, and US 189, to Jackson, Wyoming. Also near the junction are Echo Reservoir and Echo Dam. The Utah sections of I-84 that are not concurrent with

Interstate 15 Interstate 15 (I-15) is a major Interstate Highway in the western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Cana ...

are defined at Utah Code Annotated § 72-4-114(4).

History

The Portland to Utah corridor was proposed as one of the national "toll superhighways" in a 1939 report by the

Bureau of Public Roads The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. The agency's major activities are grouped into two programs, the Federal-aid Highway Program a ...

. It was formally included in the

Interstate Highway System The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. T ...

, created in 1956, and was originally proposed to be numbered as Interstate 82; however, it was never signed with this designation, and the Interstate 82 designation was later assigned to a different road that connects Ellensburg, Washington, to

Yakima, Washington Yakima ( or ) is a city in and the county seat of Yakima County, Washington, and the state's 11th-largest city by population. As of the 2020 census, the city had a total population of 96,968 and a metropolitan population of 256,728. The uninc ...

, the

Tri-Cities Tri-Cities most often refers to: *Tri-Cities, Tennessee, United States *Tri-Cities, Washington, United States Tri-City, Tricity or Tri-Cities may also refer to: Populated places Americas Canada *Tri-Cities (British Columbia), consisting of Co ...

region, and

Hermiston, Oregon Hermiston () is a city in Umatilla County, Oregon, United States. Its population of 19,696 makes it the largest city in Eastern Oregon. Hermiston is the largest, and fastest-growing, city in the Hermiston-Pendleton Micropolitan Statistical Ar ...

. The freeway was assigned the designation of I-80N in the 1958 plan, in part to correspond with US 30. The Portland segment of then-I-80N was proposed to run on the

Mount Hood Freeway The Mount Hood Freeway is a partially constructed but never to be completed freeway alignment of U.S. Route 26 and Interstate 80N (now Interstate 84), which would have run through southeast Portland, Oregon. Related projects would have cont ...

and a section of

. Plans for this were officially dropped in 1974 after a successful

freeway revolt Highway revolts (also freeway revolts, expressway revolts, or road protests) are organized protests against the planning or construction of highways, freeways, expressways, and other civil engineering projects that favor vehicles. Many freeway r ...

. The

American Association of State Highway and Transportation Officials The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United ...

established guidelines recommending that "suffixed" highways, such as I-80N, be renumbered. In 1977, Idaho officials recommended that I-80N be renumbered to I-84. The motion was seconded by officials in Utah (who initially proposed this as I-82), but opposed by Oregon and Washington. The motion passed on July 7, 1977, and the states were given until July 1, 1980, to implement a coordinated renumbering strategy. After renumbering, I-84 violated the Interstate Highway Numbering Convention by being south of the modern incarnation of I-82.

Major intersections

;Oregon * in Portland * in Portland * near Hermiston ;Idaho * in

* near Declo ;Utah * from Tremonton to Ogden * in

Auxiliary routes

Boise, Idaho Boise (, , ) is the capital and most populous city of the U.S. state of Idaho and is the county seat of Ada County. On the Boise River in southwestern Idaho, it is east of the Oregon border and north of the Nevada border. The downtown ar ...

References

External links

* {{DEFAULTSORT:Interstate 84 (Oregon-Utah) Interstate 84 84 west 84 west