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Interstate 84 in Utah

Interstate 84 marker

Interstate 84
Route information
Defined by
Maintained by UDOT
Length: 119.77 mi[1] (192.75 km)
Existed: 1956 – present
Major junctions
West end: I‑84 at Idaho state line
  I‑15 near Tremonton
US‑91 in Willard
I‑15 in Riverdale
US‑89 in Uintah
East end: I‑80 near Echo
Counties: Summit
Highway system
SR‑83 SR‑85

Interstate 84 (I-84) is a part of the 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 and Interstate 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. By 1978, construction of the freeway had been completed across Utah, as well as Oregon and most of Idaho. I-84 is unusual as there are two noncontiguous segments: Oregon, Idaho, and Utah as well as Pennsylvania, New York, Connecticut, and Massachusetts. 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 SR-86 in Henefer, and as many as 18,945 vehicles used the highway at the SR-26 interchange in Riverdale.


  • Route description 1
    • Western segment 1.1
    • Concurrency with I-15 1.2
    • Eastern segment 1.3
  • History 2
    • Earlier roads 2.1
    • Current road 2.2
  • Exit list 3
  • See also 4
  • References 5
  • External links 6

Route description

Out of the three states that the western portion of I-84 passes through, the 119.77-mile-long (192.75 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 average annual 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 Box Elder County and the Curlew Valley near farmland that utilizes center pivot irrigation before intersecting SR-30 at a diamond interchange.[6] The town of Snowville is crossed before passing to the north of the Hansel Mountains and the North Promontory Mountains. The town of Howell, accessible from an interchange with SR-83, lays to the southeast of Blue Creek Reservoir in the Blue Creek Valley. Access to the Golden Spike National Historic Site is provided by SR-83 south of Howell. The Blue Spring Hills form the southern border of Howell as I-84 continues southeast.[7] Additional center irrigation farmland is passed before giving way to more traditional farmland outside of the city of Tremonton,[6] where a trumpet interchange marks 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-15/84 in Ogden

Concurrent highways I-15/84 continue south, parallel to rail belonging to the Union Pacific Railroad (UP) past the Wellsville Mountain Wilderness, to an interchange at 1100 West in Brigham City, also known as US-91, which once in Brigham City becomes concurrent with US-89 and the two highways travel northwest from Brigham City into Box Elder Canyon towards Logan in the heart of the Cache Valley. US-89 closely parallels I-15/84 east,as the highways pass Willard Bay, 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 eastwards near Defense Depot Ogden, as the concurrent highways continue south past Farr West and Slaterville before a 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 the Ogden-Hinckley Airport, with I-15 continuing south towards Salt Lake City and Provo.[6][10]

Eastern segment

Splitting from I-15 near Roy, I-84 passes between Hill Air Force Base, which is to the south of the highway, and Washington Terrace before clipping the extreme northern portions of Davis County.[10] While in Davis County, I-84 intersects 475 East, also known as the Adams Avenue Parkway,[6] before coming to a hybrid partial cloverleaf/half-diamond interchange with US-89 along the Davis-Weber county line.[10][11]

I-84 follows the [12] passing Devil's Slide, an unusual rock formation just off the freeway.[13]

Upon entering Summit County, I-84 passes the Thousand Mile Tree, planted by Union Pacific Railroad workers to mark the construction of 1,000 miles (1,600 km) of rail from its origin in Omaha, Nebraska.[14][15] The tree was said to be the only pine tree between Omaha and Salt Lake City.[16] Another tree was planted as the original tree had died in 1900 and was removed in 1926 to during the conversion from single track to double track through the canyon.[17][18] Past the tree the freeway passes through the town of Henefer before terminating at a 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]


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.[20] In 1926, much of the route was signed as US-30S, from the now eastern terminus at I-80 (US-530 then), northwest into Ogden. Between Ogden and Brigham City, the highway was to be concurrent with US-91, then US-30S split off northwest to the Idaho border.[21] The entire western branch of US-30S was an unimproved road, however the concurrency into Ogden was paved. The remainder of the route to its now terminus was mostly graded with a few 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 renumbering of Utah State highways. Previously, the freeway's legislative designation was SR-3.[24] Unlike the other two main Interstate Highways in Utah, I-15 (the Veterans Memorial Highway) or I-80 (the Purple Heart Trail), I-84 has not been given a special name by UDOT.[25] The highway loosely follows the path of the First Transcontinental Railroad.[26] The original routing of US-30S had the highway passing into Idaho west of Black Pine Peak however,[27] 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][28]

Interstate 80N
Location: Idaho state line to Echo
Existed: 1958–1977[29][30]

Passage of the

Interstate 84
Previous state:
Utah Next state:
  • Media related to at Wikimedia Commons
  • Interstate 84 in Utah on AARoads

External links

  1. ^ a b Adderly, Kevin (January 19, 2012). "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List.  
  2. ^ Staff (2012) (PDF). Traffic on Utah Highways (Report). Utah Department of Transportation. p. 16. Retrieved December 27, 2013.
  3. ^ Staff (2012) (PDF). Truck Traffic on Utah Highways (Report). Utah Department of Transportation. pp. 15. 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 (Map). 1:772200. Retrieved December 27, 2013.
  6. ^ a b c d e f g h Google Inc. "Interstate 84 Overview". Google Maps (Map). Cartography by Google, Inc.!data=!1m4!1m3!1d825030!2d-112.3919444!3d41.4773975!2m1!1e3!4m29!3m20!1m5!1sInterstate+84%2C+Malad+City%2C+UT+83252!2s0x80ab2642f4ddddfd%3A0xbe52f05313361e6!3m2!3d42.0093271!4d-112.8434984!1m4!3m2!3d40.9711504!4d-111.4422272!6e2!3m8!1m3!1d3248!2d-111.4416157!3d40.9701419!3m2!1i1278!2i828!4f13.1!5m2!13m1!1e1!7m4!11m3!1m1!1e1!2b1&fid=0i7. Retrieved December 27, 2013.
  7. ^ a b Utah Department of Transportation (2005). Box Elder County (Map). 1:29040. General Highway Map. p. 6. Retrieved December 27, 2013.
  8. ^ Utah Department of Transportation (2005). Box Elder County (Map). 1:29040. General Highway Map. p. 7. Retrieved December 27, 2013.
  9. ^ a b "Route 84". Highway Reference. Utah Department of Transportation. January 2, 2013. Retrieved December 27, 2013. 
  10. ^ a b c Utah Department of Transportation (2005). Weber County (Map). 1:22440. General Highway Map. p. 1. Retrieved December 27, 2013.
  11. ^ Utah Department of Transportation (2005). Davis County (Map). 1:22440. General Highway Map. Retrieved December 27, 2013.
  12. ^ Utah Department of Transportation (2005). Morgan County (Map). 1:29040. General Highway Map. Retrieved December 27, 2013.
  13. ^ Powell, Allan Kent (2003). The Utah Guide (3rd ed.). Golden, Colo.: Fulcrum Publishing. p. 84.  
  14. ^ Leng, Sir John (1877). America in 1876: Pencillings During a Tour. Dundee, Scotland: Dundee Advertiser Office. p. 109.  
  15. ^ Hayden, F.V.; Davis, Daniel M. "Sun Pictures of Rocky Mountain Scenery, Photographic Collection".  
  16. ^ Wilcox, H. K. W. (1870). "Famous Trees". Appletons' Journal of Literature, Science and Art ( 
  17. ^ Staff. "Historic Sites". Morgan County Historical Society. 2007. Retrieved December 27, 2013. 
  18. ^ Smith, Linda H. (1999). A History of Morgan County. Utah Centennial County History. Salt Lake City:  
  19. ^ Utah Department of Transportation (2005). Summit County (Map). 1:22440. General Highway Map. p. 3. Retrieved December 27, 2013.
  20. ^ Lincoln Highway Association (1923). Map of Strategic Routes between Salt Lake City, Utah and California (Map). 1:2500000. Cartography by Matthews-Northrup Works. OCLC 36006905.,1909. Retrieved December 27, 2013.
  21. ^ Bureau of Public Roads (November 11, 1926). United States System of Highways Adopted for Uniform Marking by the American Association of State Highway Officials (Map). 1:7,000,000. Cartography by U.S. Geological Survey. OCLC 32889555. Retrieved December 27, 2013.
  22. ^ . Retrieved December 27, 2013.
  23. ^ Texaco (1937). Texaco Road Map Idaho, Montana, Wyoming (Map). 1:1,774,080. Cartography by Rand McNally. Section L5-M7. OCLC 52950564.,-Montana,-Wyo. Retrieved December 26, 2013.
  24. ^ a b "Route 84". Highway Resolutions. Utah Department of Transportation. November 2007. Retrieved September 21, 2008. 
  25. ^ Utah Department of Transportation. Utah's Special Highways (Map). Not to scale. Retrieved December 28, 2013.
  26. ^  
  27. ^ Shell Oil Company. Highway Map of Utah (Map). 1:1203840. Cartography by H.M. Gousha Company. Section C2.;sort:Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No;lc:RUMSEY~8~1&mi=1&trs=3. Retrieved December 26, 2013.
  28. ^ . Retrieved December 26, 2013.
  29. ^ 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. Retrieved December 27, 2013.
  30. ^ a b Staff (August 13, 1977). "Interstate 80 to become 84".  
  31. ^ Lewis, Tom (1997). Divided Highways: Building the Interstate Highways, Transforming American Life. New York: Viking. pp. 120–1, 136–7.  
  32. ^ 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. Cartography by Public Roads Administration. Retrieved December 26, 2013.
  33. ^ Public Roads Administration (October 17, 1957). Routes to be Added to the National System of Interstate and Defense Highways (Map). Scale not given. Retrieved December 27, 2013.
  34. ^ Union Oil Company of California (1968). Western United States (Map). 1:3104640. Cartography by Rand McNally & Co.. Section H7-8.
  35. ^ State Road Commission of Utah (1971). Utah Official Highway Map (Map). 1:1,102,464. Cartography by Rand McNally. Section B4-C5.
  36. ^ Staff (December 3, 1978). "Other Projects Get $5 Billion in Interstate Road 'Trades': Fewer Than 11,000 Miles Complete".  
  37. ^ Staff (September 1, 1993). "N-Waste shipments to Pass Through N. Utah in 1994".  
  38. ^ Staff (March 23, 1999). "Judge's Ruling May Open Path Through Utah for Nuke Waste". The Salt Lake Tribune. Associated Press. p. A8.  
  39. ^ a b United States nominal Gross Domestic Product per capita figures follow the "Measuring Worth" series supplied in Johnston, Louis; Williamson, Samuel H. (2014). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved April 18, 2014.  These figures follow the figures as of 2012.
  40. ^ Gorrell, Mike (October 28, 1998). "Fed Funds Pave Way For Roads; Most of $90M transportation grant will go to Olympic highway work; Grant Provides $75M for Olympic Roads". The Salt Lake Tribune. p. A1.  
  41. ^ Gorrell, Mike (October 19, 1999). "As Feds Divvy Up Last of Highway Funds, SLOC Holds Breath". The Salt Lake Tribune. p. B2.  
  42. ^ "Granite Construction Awarded $19.0 Million Highway Reconstruction Project in Utah" (Press release).  
  43. ^ Manson, Pamela (July 8, 2009). "Orem construction company admits lying". The Salt Lake Tribune.  


See also

County Location Mile[9] km Exit Destinations Notes
Box Elder   0.000 0.000 Idaho–Utah state line
I‑84 continues into Idaho
  4.660 7.500 5 SR‑30 west – Park Valley, Elko West end of SR-30 overlap; Former US-30S
Snowville 7.125 11.467 7 Snowville
  11.978 19.277 12 Ranch Exit
  15.808 25.441 16 Hansel Valley
  17.385 27.978 17 Rattlesnake Pass
  20.317 32.697 20 Blue Creek
  24.457 39.360 24 Pocatello Valley
Howell 26.567 42.755 26 SR‑83 south – Howell, ATK Access to Golden Spike National Historic Site
  32.414 52.165 32 Ranch Exit
  39.508 63.582 39 Garland, Bothwell
Bothwell Junction 40.824 65.700 40 SR‑102 – Tremonton, Bothwell
  42.012 67.612 41 I‑15 north (SR-30 east) – Pocatello West end of I-15 overlap; east end of SR-30 overlap; no exit number westbound
  I-84 overlaps Interstate 15 for 38.309 mi (61.652 km)
Weber Riverdale 81.043 130.426 I‑15 south – Salt Lake City East end of I-15 overlap; westbound exit is via exit 81
81.727 131.527 81 SR‑26 – Riverdale
Davis Uintah 84.594 136.141 85 Uintah, South Weber (Adams Avenue Parkway) Adams Avenue Parkway is a private toll road
county line
Uintah Junction 87.771 141.254 87 US‑89 – South Ogden, Salt Lake City, Ogden Signed as exits 87A (north) and 87B (south) westbound
Morgan   91.240 146.837 Rest area
Eastbound exit and entrance only
  92.339 148.605 92 SR‑167 – Mountain Green, Huntsville Westbound exit is via exit 96
  93.904 151.124 Rest area
Westbound exit and entrance only
  96.504 155.308 96 Stoddard, Peterson
Morgan 103.333 166.298 103 Morgan
  106.173 170.869 106 Ranch Exit
  108.272 174.247 108 Taggart
  111.313 179.141 111 Croydon Former SR-158
  110.761 178.253 Devil's Slide View Area
Summit   112.739 181.436 112 Henefer (SR-86)
Henefer 115.399 185.717 115 Henefer, Echo (SR-65)
  119.773 192.756 120 I‑80 – Salt Lake City, Cheyenne Eastern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Exit list

[43] 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.[42][39] In 1994 I-84 was planned to be used to transport

The I-80N designation was changed to I-84 in 1977 by the American Association of State Highway and Transportation Officials, 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][30] By 1978, construction of I-84 was complete across Utah, Oregon and most of Idaho.[36]

[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.[34]

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