Interstate 84 in Utah

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This article is about the section of Interstate 84 in Utah. For the entire route, see Interstate 84 (Oregon–Utah).

East end I-80 near Echo
Location
CountryUnited States
StateUtah
CountiesBox Elder, Weber, Davis, Morgan, Summit
Highway system
  • Utah State Highway System
←
SR-85

Interstate 84 (I-84) is a part of the Interstate Highway System that links Portland, Oregon, to I-80 near Echo, Utah. The 117.38-mile-long (188.90 km) segment in the US state of Utah is the shortest of any of the three states the western I-84 passes through and contains the eastern terminus of the highway. I-84 enters Box Elder County near Snowville before becoming concurrent with I-15 in Tremonton. The concurrent highways travel south through Brigham City and Ogden and separate near Ogden-Hinckley Airport. Turing east along the Davis County border, I-84 intersects US Route 89 (US-89) and enters Weber Canyon as well as Morgan County. While in Morgan County, I-84 passes the Devil's Gate-Weber Hydroelectric Power Plant and Devil's Slide rock formation. Past Morgan, the highway crosses into Summit County, past the Thousand Mile Tree before reaching its eastern terminus at I-80 near Echo.

Construction of the controlled-access highway was scheduled in late 1957 under the designations Interstate 82S (I-82S) and Interstate 80N (I-80N). The I-82S designation was only applied on paper for about a year, but the I-80N designation was the highway's official designation until 1977 when it was renumbered I-84 by the American Association of State Highway and Transportation Officials (AASHTO). By 1986, construction of the freeway had been completed across the three states. Average traffic in 2012, along the non-concurrent parts of I-84, ranged from as few as 6,655 vehicles traveling along I-84 at the interchange with State Route 86 (SR-86) in Henefer, and as many as 18,945 vehicles used the highway at the SR-26 interchange in Riverdale.

Route description

Out of the three states that the western portion of I-84 passes through, the 117.38-mile-long (188.90 km) segment in Utah is the shortest. By comparison, the longest stretch of western I-84 through a single state is the 375.17-mile-long (603.78 km) segment in Oregon. I-84 also has a noncontiguous eastern segment that passes through Pennsylvania, New York, Connecticut, and Massachusetts: all four of these segments are shorter than the Utah segment.[1]

Every year, the Utah Department of Transportation (UDOT) conducts a series of surveys on its highways in the state to measure traffic volume. This is expressed in terms of annual average daily traffic (AADT), a measure of traffic volume for any average day of the year. In 2012, UDOT calculated that as few as 6,655 vehicles traveled I-84 at the interchange with SR-86 in Henefer, and as many as 18,945 vehicles used the highway at the SR-26 interchange in Riverdale.[2] Between 27 and 57 percent of the traffic recorded consisted of trucks.[3] These counts are of the portion of the freeway in Utah and are not reflective of the entire Interstate or of its concurrency with I-15. As part of the Interstate Highway System,[4] the entire route is listed on the National Highway System, a system of roads that are important to the nation's economy, defense, and mobility.[5]

Western segment

Crossing the Idaho–Utah state line, I-84 enters

trumpet interchange marks where I-15 turns north towards Malad City and Pocatello.[8] Heading southeast from this interchange, I-84 and I-15 are concurrent for just over 38 miles (61 km).[9]

Concurrency with I-15

Northbound along I-15/I-84 in Ogden

Concurrent highways I-15/I-84 continue south, parallel to rail belonging to the

Willard Bay State Park, and Bear River Migratory Bird Refuge before crossing into Weber County.[6][7]

Upon entering Weber County, the rail line that the highway has paralleled since Tremonton splits off eastward near

Southern Pacific Railroad rail line, which traverses the Great Salt Lake on a causeway, crosses under the freeway. The city of Ogden is bypassed by the Interstates, with US-89 serving downtown. US-89 is accessible via interchanges with SR-39, SR-79, and SR-104 in addition to I-84 further southeast. I-84 splits from I-15 at the south end of Ogden-Hinckley Airport, with I-15 continuing south toward Salt Lake City and Provo.[6][10]

Eastern segment

Thousand Mile Tree

Splitting from I-15 near

half diamond interchange with US-89 along the Davis–Weber county line.[10][11]

I-84 follows the Weber River into Weber Canyon, Morgan County, and Wasatch–Cache National Forest. Once in the canyon, the carriageways of the highway split to accommodate the Devil's Gate-Weber Hydroelectric Power Plant. Following the river south, I-84 exits the forest and enters the county seat of Morgan. Leaving the city the highway turns back east,[6][12] passing Devil's Slide, an unusual rock formation just off the freeway.[13]

Upon entering

directional T interchange with I-80 just south of the census-designated place of Echo. Immediately south of the interchange is Echo Reservoir and Echo Dam.[6][19]

History

I-84 approaching its eastern terminus

Earlier roads

Most of the original routing of what is now I-84 existed as early as 1923; however, the portion of now I-84 into Idaho was not yet constructed.

improved sections,[22] and, by 1937, the entire route was paved.[23]

Current road

The first Utah state route to have the number 84 is what is now known as SR-126. SR-126 was originally numbered SR-84 until the 1977 Utah state route renumbering. Previously, the freeway's legislative designation was SR-3.[24] Like the other two main Interstate Highways in Utah, I-15 (Veterans Memorial Highway) and I-80 (Purple Heart Trail), I-84 has also been given a special name of "Vietnam Veterans Memorial Highway". House Bill HB275, sponsored by Utah Representative Justin Fawson, North Ogden, authorizing the name designation was signed into law by Utah Governor Gary Herbert on March 30, 2015.[25][26] The highway loosely follows the path of the first transcontinental railroad.[27] The original routing of US-30S had the highway passing into Idaho west of Black Pine Peak; however,[28] the new I-84 was constructed to the east. The original roadways are now numbered SR-30, SR-42 and Idaho State Highway 2847.[6][29]

Interstate 80N marker

Interstate 80N

LocationIdaho state line to Echo
Existed1958–1977[30][31]

Passage of the Federal-Aid Highway Act of 1956 formed the Interstate Highway System;[32] however, only the western segment of now I-84 was approved at this time, and a designation of I-82S was assigned to a then unconstructed controlled-access highway across Box Elder County in 1957.[33] The eastern segment of the highway was added later in 1957,[34] and the route was numbered I-80N by 1958.[30] By 1968, portions of the western half of the freeway had been completed, along with the segment between Tremonton and Brigham City. A portion of the freeway was completed around Morgan as well.[35] By 1971, most of the western portions of the freeway had been constructed with two sections remaining that had at-grade intersections. Along the concurrency, there were gaps between Brigham City and Pleasant View and one small gap near the Devil's Slide.[36]

The I-80N designation was changed to I-84 in 1977 by the AASHTO, over objections from the Washington State Department of Transportation and the Idaho Transportation Department, and with the support of UDOT and the Oregon Department of Transportation.[24][31] By 1978, construction of I-84 was complete across most of the three states.[37] In September 1986, the final section of the highway was opened on the 11 miles (18 km) from Tremonton to Blue Creek Summit, following three years of construction that cost $21 million (equivalent to $49.5 million in 2023[38]).[39]

In 1994, I-84 was planned to be used to transport

low-level radioactive waste from Idaho National Laboratory to the Waste Isolation Pilot Plant in Carlsbad, New Mexico, via Wyoming.[40] This did not start until 1999 however due to the delay in the opening of the New Mexican plant.[41] A $20-million (equivalent to $34.9 million in 2023[38]) reconstruction of the US-89 interchange at the mouth of Weber Canyon was financed partly by the funding obtained by the state in preparation for the 2002 Winter Olympics in 1998[42] and was scheduled to begin in 2000.[43] Reconstruction of a 10-mile-long (16 km) segment of I-84 between Mountain Green and Morgan was done between 2004 and 2005 at a cost of $19 million (equivalent to $29.4 million in 2023[38]).[44] One of the sub-contractors on the job was found guilty of lying about sub-par work done on installation of roadside impact absorbers along this stretch.[45]

Exit list

CountyLocationmi[9]kmExitDestinationsNotes
Box Elder​0.0000.000
 I-84 west – Boise		Continuation into Idaho
​4.6607.5005
US-30S
Snowville7.12511.4677Snowville
​11.97819.27712Ranch Exit
​15.80825.44116Hansel Valley
​17.38527.97817Rattlesnake Pass
​20.31732.69720Blue Creek
​24.45739.36024Pocatello Valley
Golden Spike National Historic Site
​32.41452.16532Whites Valley RoadFormerly signed as "Ranch Exit"
​39.50863.58239Garland, Bothwell
Bothwell Junction
40.82465.70040 SR-102 – Tremonton, Bothwell
​42.01267.61241
 I-15 north – Pocatello		West end of I-15 overlap; signed as exit 379 westbound
I-84 overlaps Interstate 15 for 38.309 mi (61.652 km)
Salt Lake City
East end of I-15 overlap; I-15 exit 340; westbound access via exit 81
81.727131.52781

 SR-26 (Riverdale Road) to I-15 south – Riverdale
private toll road
here
Salt Lake City, Ogden
Signed as exits 87A (south) and 87B (north) westbound
Morgan​91.240146.837Rest area (eastbound)
​92.339148.60592
 SR-167 north – Mountain Green, Huntsville		Eastbound exit and westbound entrance
​93.904151.124Rest area (westbound)
​96.504155.30896Stoddard, Peterson
Morgan103.333166.298103 SR-66 – Morgan
​106.173170.869106Rees LaneFormerly signed as "Ranch Exit"
​108.272174.247108Taggart
​111.313179.141111
SR-158
​110.761178.253Devil's Slide View Area
Summit​112.739181.436112
 SR-86 east – Henefer
Henefer115.399185.717115
 SR-65 south – Henefer, Echo
​119.773192.756120
semi-directional T interchange
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References

  1. ^ a b "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. December 31, 2021. Retrieved August 7, 2022.
  2. ^ Utah Department of Transportation (2012). Traffic on Utah Highways (Report). Utah Department of Transportation. p. 16. Archived from the original (PDF) on September 2, 2015. Retrieved December 27, 2013.
  3. ^ Utah Department of Transportation (2012). Truck Traffic on Utah Highways (Report). Utah Department of Transportation. p. 15. Archived from the original (PDF) on September 2, 2015. Retrieved December 25, 2013.
  4. ^ Slater, Rodney E. (Spring 1996). "The National Highway System: A Commitment to America's Future". Public Roads. 59 (4). Retrieved January 24, 2011.
  5. ^ Federal Highway Administration (November 18, 2013). National Highway System: Utah (PDF) (Map). 1:772,200. Washington, DC: Federal Highway Administration. Retrieved December 27, 2013.
  6. ^ a b c d e f g h Google (December 27, 2013). "Interstate 84 Overview" (Map). Google Maps. Google. Retrieved December 27, 2013.
  7. ^ a b Utah Department of Transportation (2005). Box Elder County (Map). 1:29,040. General Highway Map. Salt Lake City: Utah Department of Transportation. p. 6. Archived from the original on October 22, 2013. Retrieved December 27, 2013.
  8. ^ Utah Department of Transportation (2005). Box Elder County (Map). 1:29,040. General Highway Map. Salt Lake City: Utah Department of Transportation. p. 7. Archived from the original on December 27, 2013. Retrieved December 27, 2013.
  9. ^ a b Utah Department of Transportation (January 2, 2013). "Route 84". Highway Reference. Utah Department of Transportation. Archived from the original on September 22, 2008. Retrieved December 27, 2013.
  10. ^ a b c Utah Department of Transportation (2005). Weber County (Map). 1:22,440. General Highway Map. Salt Lake City: Utah Department of Transportation. p. 1. Archived from the original on December 28, 2013. Retrieved December 27, 2013.
  11. ^ Utah Department of Transportation (2005). Davis County (Map). 1:22,440. General Highway Map. Salt Lake City: Utah Department of Transportation. Archived from the original on October 23, 2013. Retrieved December 27, 2013.
  12. ^ Utah Department of Transportation (2005). Morgan County (Map). 1:29,040. General Highway Map. Salt Lake City: Utah Department of Transportation. Archived from the original on October 23, 2013. Retrieved December 27, 2013.
  13. ISBN 9781555911140
    . Retrieved December 27, 2013.
  14. OCLC 1658991
    . Retrieved December 28, 2013.
  15. ^ Hayden, F.V.; Davis, Daniel M. "Sun Pictures of Rocky Mountain Scenery, Photographic Collection". Utah State University Special Collections and Archives. Archived from the original on January 12, 2007. Retrieved January 6, 2007.
  16. OCLC 8241845
    . Retrieved December 27, 2013.
  17. ^ Morgan County Historical Society (2007). "Historic Sites". Morgan County Historical Society. Retrieved December 27, 2013.
  18. ISBN 978-0913738368. Archived from the original
    (PDF) on December 28, 2013. Retrieved December 27, 2013.
  19. ^ Utah Department of Transportation (2005). Summit County (Map). 1:22,440. General Highway Map. Salt Lake City: Utah Department of Transportation. p. 3. Archived from the original on October 23, 2013. Retrieved December 27, 2013.
  20. OCLC 36006905. Archived from the original
    on December 26, 2013. Retrieved December 27, 2013.
  21. OCLC 32889555. Retrieved November 7, 2013 – via Wikimedia Commons
    .
  22. OCLC 39724225
    . Retrieved December 27, 2013.
  23. OCLC 52950564
    . Retrieved December 26, 2013.
  24. ^ a b Utah Department of Transportation (November 2007). "Route 84". Highway Resolutions. Utah Department of Transportation. Archived from the original on September 22, 2008. Retrieved September 21, 2008.
  25. ^ "HB0275". le.utah.gov. Retrieved August 7, 2022.
  26. ^ Utah Department of Transportation. Utah's Special Highways (Map). Not to scale. Salt Lake City: Utah Department of Transportation. Archived from the original on January 9, 2013. Retrieved December 28, 2013.
  27. ^ United States Congress (1969). Congressional Record. Vol. 115, Part 2. Government Printing Office. p. 29631. Retrieved December 27, 2013.
  28. H.M. Gousha Company. Highway Map of Utah
    (Map). 1:1,203,840. § C2. Retrieved December 26, 2013.
  29. ^ Idaho Transportation Department. Idaho Official State Highway Map (PDF) (Map). Scale not given. Boise: Idaho Transportation Department. §§ M5–M6. Retrieved December 26, 2013.
  30. ^ a b Public Roads Administration (June 27, 1958). Official Route Numbering for the National System of Interstate and Defense Highways as Adopted by the American Association of State Highway Officials (Map). Scale not given. Washington, DC: Public Roads Administration. Retrieved December 27, 2013.
  31. ^
    OCLC 367900151
    .
  32. ISBN 0-670-86627-X
    .
  33. ^ Public Roads Administration (August 14, 1957). Official Route Numbering for the National System of Interstate and Defense Highways as Adopted by the American Association of State Highway Officials (Map). Scale not given. Washington, DC: Public Roads Administration. Retrieved December 26, 2013.
  34. ^ Public Roads Administration (October 17, 1957). Routes to be Added to the National System of Interstate and Defense Highways (Map). Scale not given. Washington, DC: Public Roads Administration. Retrieved December 27, 2013.
  35. Union Oil Company of California
    ; Rand McNally & Co. (1968). Western United States (Map). 1:3,104,640. §§ H7–H8.
  36. ^ State Road Commission of Utah; Rand McNally (1971). Utah Official Highway Map (Map). 1:1,102,464. Salt Lake City: State Road Commission of Utah. §§ B4-C5.
  37. ProQuest 123565578
    .
  38. ^
    Gross Domestic Product deflator
    figures follow the MeasuringWorth series.
  39. Newspapers.com. Free access icon
  40. ProQuest 288598169
    .
  41. ProQuest 288903298
    .
  42. ProQuest 288847913
    .
  43. ProQuest 288909759
    .
  44. ProQuest 448224430
    .
  45. ProQuest 280593335
    .

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Interstate 84
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Idaho 		Utah Next state:
Terminus

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