Interstate 84 in Idaho
Vietnam Veterans Memorial Highway | ||||
Route information | ||||
Maintained by ITD | ||||
Length | 275.650 mi[1] (443.616 km) | |||
NHS | Entire route | |||
Major junctions | ||||
West end | I-84 at Oregon state line | |||
East end | I-84 at Utah state line | |||
Location | ||||
Country | United States | |||
State | Idaho | |||
Counties | Payette, Canyon, Ada, Elmore, Gooding, Jerome, Minidoka, Cassia, Oneida | |||
Highway system | ||||
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Interstate 84 (I-84) in the U.S. state of
I-84 runs for 276 miles (444 km) within Idaho, beginning near
Route description
I-84 is the longest Interstate highway in Idaho, running for 276 miles (444 km) and connecting several of the state's largest metropolitan areas. It has a single auxiliary route, I-184 in Boise, and several business routes.[2] The highway was officially designated as the Vietnam Veterans Memorial Highway in 2014, mirroring the name for Oregon's section of I-84.[3][4] The Idaho section of I-84 is maintained by the Idaho Transportation Department (ITD), which conducts an annual survey of traffic on certain highway segments that is expressed in terms of annual average daily traffic (AADT), a measure of traffic volume for any average day of the year. Average daily traffic volumes on I-84 in 2018 ranged from a minimum of 9,552 vehicles near Sweetzer Summit and 139,113 vehicles at I-184 in western Boise.[5]
Boise and Treasure Valley
I-84 enters the state of Idaho after crossing the
The freeway enters the
I-84 expands to eight lanes as it leaves Nampa and enters Ada County, passing through suburban neighborhoods in Meridian.[9] The freeway crosses under two single-point urban interchanges at Ten Mile Road and SH-69, along with a partial cloverleaf interchange where SH-55 splits from the concurrency to head north.[10] I-84 enters the city of Boise and expands to ten lanes before an interchange with I-184, an auxiliary route that travels into Downtown Boise. I-84 turns southeast and travels around the city's outer residential neighborhoods, passing the main terminal at Boise Airport and a nearby industrial area. The freeway is rejoined by US 20 and US 26 before leaving Boise, climbing out of Treasure Valley by following Fivemile Creek over a barren plateau.[7][8]
Mountain Home and Magic Valley
The highway crosses into
I-84 travels upstream along the north bank of the Snake River to
The freeway travels around the south side of Wendell and turns east to follow an active railroad through a rural area that marks the boundary of
Southeastern Idaho
I-84 passes north of Burley, intersecting SH-27 near Paul. At a partial cloverleaf interchange in northeastern Heyburn, the freeway intersects SH-24 and is rejoined by US 30, beginning a new concurrency as the highway leaves the Magic Valley. I-84 crosses over the Snake River into Cassia County and intersects SH-25 and SH-25 at an interchange on the east bank of the river near Declo. Near the Minidoka National Wildlife Refuge, I-84 reaches the western terminus of I-86, which carries US 30 and follows the Snake River upstream to American Falls and Pocatello. I-84 turns southeast from the interchange and continues into the Raft River Valley, running parallel to SH-81 near Horse Butte in view of the Cotterel Mountains.[7][8]
After crossing the rural valley, I-84 begins following Meadow Creek and climbs into Mortenson Canyon, which marks the northeastern extent of the Black Pine Mountains. The highway crests at Sweetzer Summit, located 5,522 feet (1,683 m) above sea level, and descends into the Juniper Valley on the south side of the Sublett Range in Sawtooth National Forest.[13][14] I-84 continues southeast across the valley, passing a set of rest areas in Oneida County, and reaches the Utah state border northwest of Snowville.[7][8] The freeway continues into Utah and passes through Ogden before terminating at a junction with I-80 in the Wasatch Range.[15]
History
Prior to the construction of I-84, the corridor was served by Idaho State Highway 2 and Route A of the Sampson Trails system.
The Interstate highway was initially designated in 1957 as Interstate 82, but was renumbered as Interstate 80N in 1958 to correspond with US 30.[18]
The route of I-80N between Nampa and Boise was selected in 1958 as one of eight proposals and completed in stages between 1965 and 1968.[19][20] Rural sections in southwestern Idaho had already been completed by the mid-1960s, connecting Ontario, Oregon, to Caldwell, and Boise to Mountain Home.[19] The 6.6-mile (10.6 km) Nampa–Meridian section opened to traffic on September 29, 1965.[21] Another 4.5 miles (7.2 km) from SH-69 in Meridian to western Boise opened on December 12, 1968, at a cost of $9.5 million.[22] The freeway was extended west from Nampa to Caldwell on December 21, 1966, filling a gap in Interstate 80N and connecting to an already-completed rural section.[23] The 11.1-mile (17.9 km) bypass around southeastern Boise was opened on December 1, 1969. It cost $7.13 million to construct and included five interchanges.[24] Another section was opened around the same time in Sublett in eastern Cassia County, which caused the killing of eighteen mule deer from a local herd from collisions with drivers within the first six weeks.[25]
Renumbering and reconstruction
On May 1, 1980, I-80N was renumbered to I-84 to eliminate confusion with the western section of the non-suffixed I-80, which split from I-80N in Salt Lake City and continued west to San Francisco.[26] The change was approved by AASHTO in July 1977 and resulted in the replacement of 1,000 signs along the freeway in Idaho.[27][28]
Several rest areas on I-84 were closed in 1992 due to budget cuts and maintenance issues and their restoration was dependent on several federal highway bills that were never passed.[29]
To address increasing traffic congestion in the Boise metropolitan area, fueled by population growth and suburban development, the Idaho Transportation Department (ITD) has widened 24 miles (39 km) of I-84 with funds from a bond sale approved by the state legislature in 2005.[30][31] A six-mile (10 km) section between eastern Nampa and Meridian was widened to six lanes in October 2009 and eight lanes in August 2011 as part of a $113 million expansion project.[32][33] The agency has also built several single-point urban interchanges (SPUIs) in Meridian and Boise to improve efficiency.[10][34]
Construction of a widened eight-lane section of I-84 through Nampa began in July 2019 and was completed two years later at a cost of $150 million.[35][36] The project included several new overpasses and rebuilt interchanges—including one SPUI—from Franklin Boulevard to Karcher Road (SH-55).[37][38] A second phase to expand the freeway to six lanes for four miles (6.4 km) through Caldwell began construction in 2021 and was completed in August 2023 at a cost of $300 million.[39][40] The third phase, extending north to Centennial Way, is planned to begin construction in 2023; the final phase to the SH-44 interchange near Middleton is under design and study as of 2021[update].[36]
In 2017, the ITD also began work to resurface and restore fifteen bridges on I-84 that had deteriorated over their lifespan. The project also included pavement repair and improvements on 21 miles (34 km) of the highway in the Magic Valley region.[41]
In 2014 and 2019, because of increased speeds and the installation of new interchanges at Declo and Twin Falls, the ITD closed the Jerome rest area and extended the Cotterell rest area to make way for a new weigh station.[42][43] To remedy this Idaho joined the Interstate Oasis Program and opened three truck stops in Twin Falls and Jerome.[44]
Exit list
County | Location | mi[1] | km | Exit | Destinations | Notes |
---|---|---|---|---|---|---|
Payette | | 0.000 | 0.000 | I-84 west – Portland | Continuation into Oregon | |
| 2.876 | 4.628 | 3 | US 95 – Parma, Fruitland, Payette | ||
| 9.498 | 15.286 | 9 | US 30 west – Emmett, New Plymouth | West end of US-30 overlap | |
| 12.906 | 20.770 | 13 | Black Canyon Junction | ||
Canyon | | 17.335 | 27.898 | 17 | Sand Hollow | |
| 24.839 | 39.974 | 25 | SH-44 – Middleton | ||
| 25.994 | 41.833 | 26 | US 20 west / US 26 west – Parma, Notus | West end of US-20/US-26 overlap | |
27.620 | 44.450 | 28 | 10th Avenue – Caldwell City Center | |||
28.650 | 46.108 | 29 | US 20 east / US 26 east (Franklin Road) | East end of US-20/US-26 overlap | ||
Nampa | 33.539 | 53.976 | 33 | SH-55 south / Midland Boulevard – Nampa, Marsing | West end of SH-55 overlap | |
34.965 | 56.271 | 35 | Northside Boulevard | |||
35.985 | 57.912 | 36 | Franklin Boulevard | |||
37.945 | 61.067 | 38 | ||||
Ada | | 42.000 | 67.592 | 42 | Ten Mile Road | |
Meridian | 44.007 | 70.822 | 44 | SH-69 – Meridian, Kuna | ||
45.998 | 74.027 | 46 | SH-55 north – McCall, Eagle | East end of SH-55 overlap | ||
Boise | 49.307 | 79.352 | 49 | I-184 east / Franklin Road – City Center | Left exit eastbound; I-184 exit 0 | |
50.140 | 80.693 | 50 | Cole Road / Overland Road | Signed as exits 50A (Overland Rd. west) and 50B (Cole/Overland) eastbound, and 50A (Cole/Overland) and 50B (Overland Rd. east) westbound | ||
51.997 | 83.681 | 52 | Orchard Street | |||
53.483 | 86.073 | 53 | Vista Avenue – Boise Airport | |||
54.485 | 87.685 | 54 | US 20 / US 26 west (Broadway Avenue) | West end of US-20/US-26 overlap | ||
56.932 | 91.623 | 57 | SH-21 (Gowen Road) – Idaho City | |||
| 59.510 | 95.772 | 59 | S. Eisenman Road / Memory Road | Signed as exits 59A (S. Eisenman Rd.) and 59B (Memory Rd.) eastbound | |
| 63.517 | 102.221 | 64 | Blacks Creek Road – Kuna | ||
| 70.772 | 113.896 | 71 | Mayfield, Orchard | ||
Elmore | | 74.333 | 119.627 | 74 | Simco Road | |
| 90.280 | 145.292 | 90 | Eastbound signage | ||
West Mountain Home | Westbound signage | |||||
| 95.193 | 153.198 | 95 | East end of US-20 overlap | ||
| 99.570 | 160.242 | 99 | Old Oregon Trail Road – Mountain Home | ||
| 111.800 | 179.925 | 112 | |||
| 113.856 | 183.233 | 114 | Westbound exit and eastbound entrance | ||
| 120.149 | 193.361 | 120 | I-84 BL east – Glenns Ferry | Eastbound exit and westbound entrance | |
| 121.094 | 194.882 | 121 | I-84 BL west – King Hill, Glenns Ferry | ||
| 125.159 | 201.424 | 125 | Paradise Valley | ||
| 128.993 | 207.594 | 129 | King Hill | ||
East end of US-30 overlap | ||||||
| 140.405 | 225.960 | 141 | East end of US-26 overlap | ||
| 146.870 | 236.364 | 147 | Tuttle | ||
| 155.260 | 249.867 | 155 | To SH-46 – Wendell, Hagerman | ||
| 156.581 | 251.993 | 157 | SH-46 – Gooding, Wendell | ||
Jerome | | 165.160 | 265.799 | 165 | SH-25 – Jerome | |
Jerome | 168.010 | 270.386 | 168 | SH-79 | ||
| 173.013 | 278.437 | 173 | US 93 – Twin Falls, Sun Valley | Main exit into Twin Falls via the Perrine Bridge | |
| 181.930 | 292.788 | 182 | SH-50 – Kimberly, Eden, Twin Falls | ||
| 188.301 | 303.041 | 188 | Valley Road – Hazelton, Eden | ||
| 193.525 | 311.448 | 194 | SH-25 west (Ridgeway Road) – Hazelton | West end of SH-25 overlap | |
Jerome–Minidoka county line | | 200.536 | 322.731 | 201 | SH-25 east / Kasota Road – Paul | East end of SH-25 overlap |
West end of US-30 overlap | ||||||
Cassia | | 216.395 | 348.254 | 216 | SH-25 / SH-77 – Albion, Rupert, Declo | |
| 221.880 | 357.081 | 222 | I-86 east / US 30 east to I-15 – Pocatello | Left exit eastbound; East end of US-30 overlap | |
| 227.950 | 366.850 | 228 | To SH-81 / Yale Road – Malta, Declo | ||
| 236.655 | 380.859 | 237 | Idahome Road | ||
| 244.810 | 393.984 | 245 | Sublett Road – Malta | ||
| 253.705 | 408.299 | 254 | Sweetzer Road | ||
Oneida | | 262.512 | 422.472 | 263 | Juniper Road | |
| 275.650 | 443.616 | Salt Lake City | Continuation into Utah | ||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References
- ^ a b Idaho Transportation Department, Milepoint Log Reports Archived July 14, 2004, at the Wayback Machine
- ^ a b "Interstate 84 – Idaho". Idaho Transportation Department. May 2006. Archived from the original on September 1, 2010. Retrieved June 21, 2018.
- ^ Russell, Betsy (August 12, 2014). "I-84 now officially Vietnam Veterans Memorial Highway". The Spokesman-Review. Retrieved June 18, 2018.
- ^ "Idaho S1227: "Archived copy" (PDF). Archived from the original (PDF) on December 22, 2014. Retrieved August 14, 2014.
{{cite web}}
: CS1 maint: archived copy as title (link)" - ^ "ATR & WIM Data: Interstate 84". Idaho Transportation Department. Retrieved April 21, 2019.
- ^ "Rest Area Map". Idaho Transportation Department. Retrieved March 14, 2019.
- ^ a b c d e f g h Google (March 14, 2019). "Interstate 84 (Idaho)" (Map). Google Maps. Google. Retrieved March 14, 2019.
- ^ a b c d e f g h i j Idaho State Highway Map (PDF) (Map). 1:1,248,000. Idaho Transportation Department. May 2017. Retrieved March 14, 2019.
- The Idaho Press-Tribune. October 30, 2009. p. 1.
- ^ a b Beech, Holly (September 6, 2015). "Meridian Interchange about 2 months away from completion". Idaho Press. p. 3. Retrieved April 19, 2019.
- ^ "Idaho Statewide Rail Plan" (PDF). Idaho Transportation Department. June 21, 2013. Retrieved April 20, 2019.
- ^ Weeks, Andrew (May 20, 2009). "Historic Malad Gorge popular outdoors spot". Times-News. Twin Falls, Idaho. Retrieved April 20, 2019.
- ^ Welch, Laurie (December 6, 2009). "Lonesome highway". Times-News. Twin Falls, Idaho. p. 5. Retrieved April 20, 2019.
- ^ Cothern, Mike (September 1, 2011). "A Lesser Known Mountain Range Offers Hikers Birds-eye View of Great Salt Lake". Times-News. Twin Falls, Idaho. Retrieved April 20, 2019.
- OCLC 1056775025. Retrieved April 20, 2019.
- ^ 1926 map of Southern Idaho
- .
- ^ "Interstate 82N Changed to 80N". Idaho State Journal. Pocatello, Idaho. July 5, 1958. p. 8. Retrieved April 21, 2019 – via Newspapers.com.
- ^ a b Benthien, Arden (September 4, 1965). "Gap Being Filled In Superhighway". Weekender Magazine. Idaho Free Press. p. 3. Retrieved April 19, 2019 – via Newspapers.com.
- ^ "Interstate Opens Near Boise". Idaho State Journal. Associated Press. December 13, 1968. p. 8. Retrieved April 19, 2019 – via Newspapers.com.
- ^ Benthien, Arden (September 29, 1965). "Nampa-to-Meridian Superhighway Opens". Idaho Free Press. Nampa, Idaho. p. 1. Retrieved April 23, 2019 – via Newspapers.com.
- ^ "Boise West Connector Dedicated at Ceremonies Thursday; New Highway Connector Links Boise, Interstate". The Idaho Statesman. December 13, 1968. p. 1D. Retrieved August 26, 2021 – via Newspapers.com.
- ^ "Mayors Cite Importance Of New Highway Section". Idaho Free Press. Nampa, Idaho. December 21, 1966. p. 1. Retrieved April 23, 2019 – via Newspapers.com.
- ^ Bailey, Margaret (December 2, 1969). "Trucks Roll in Opening Of Bypass". The Idaho Statesman. p. 9A. Retrieved February 11, 2023 – via Newspapers.com.
- ^ "Studying wildlife ecology through road-killed animals". Idaho State Journal. October 31, 2018. Retrieved April 19, 2019.
- ^ "Interstate 80N will become Interstate 84 on May Day". Statesman Journal. April 3, 1980. p. B. Retrieved April 21, 2019 – via Newspapers.com.
- ^ Special Committee on U.S. Route Numbering (July 6, 1977). "Route Numbering Committee Agenda" (PDF) (Report). Washington, DC: American Association of State Highway and Transportation Officials. p. 485. Retrieved February 12, 2023 – via Wikimedia Commons.
- ^ "Interstate signs changed to read I-84". Times-News. Twin Falls, Idaho. April 25, 1980. p. B2. Retrieved April 23, 2019 – via Newspapers.com.
- ^ Williams, Terrell; Garber, Virginia (July 17, 1996). "New Interstate 84 rest area slated for Malad Gorge". Times-News. Twin Falls, Idaho. p. B1. Retrieved April 20, 2019 – via Newspapers.com.
- ^ Kreller, Kathleen (November 14, 2004). "Meridian growth, traffic on a collision course". Idaho Statesman. p. 1.
- ^ Sewell, Cynthia (January 11, 2017). "From the archives: ITD cancels I-84 makeover of Nampa-Caldwell section". Idaho Statesman. Retrieved February 12, 2023.
- ^ Nance, Jesse (October 31, 2009). "I-84 milestone celebrated". Idaho Press. p. 1.
- ^ Sewell, Cynthia (August 2, 2011). "Fourth westbound lane on I-84 between Meridian, Garrity interchanges will open Wednesday". Idaho Statesman.
- ^ "Ten Mile Interchange now open". The Idaho Press. May 25, 2011. Retrieved April 19, 2019.
- ^ Talerico, Kate (June 23, 2019). "Drivers have wanted this stretch of I-84 widened for a decade. It's finally happening". Idaho Statesman. Retrieved February 12, 2023.
- ^ a b I-84 Corridor: Caldwell–Nampa (PDF) (Map). Idaho Transportation Department. December 2021. Retrieved February 12, 2023.
- ^ Bamer, Erin (September 2, 2019). "I-84 construction in Nampa to last through next year". The Idaho Press. Retrieved February 12, 2023.
- ^ Bamer, Erin (March 28, 2020). "Widening of I-84 continues in Canyon County". The Idaho Press. Retrieved February 12, 2023.
- ^ Corbin, Clark (July 13, 2021). "$300M I-84 expansion project will add lanes, replace bridges in Canyon County". The Idaho Press. Retrieved February 12, 2023.
- ^ Roberts, Rachel (April 19, 2023). "Update: Weather delays opening of extra lanes on I-84 between Caldwell and Nampa". Idaho Statesman. Retrieved June 21, 2023.
- ^ Kennison, Heather (April 27, 2017). "State to spend $36M in new construction in region". Times-News. Twin Falls, Idaho. Retrieved April 20, 2019.
- ^ Rumpf, Morgan. "Jerome rest area to permanently close". www.kmvt.com. Retrieved November 9, 2019.
- ^ "Cotterell Rest Area wins engineering excellence award". Weekly Mailer. Retrieved November 9, 2019.
- ^ ":: Interstate Oasis Program, 9855-9857 [E6-2682] ::". Justia Regulation Tracker. Retrieved November 9, 2019.
External links
- Idaho Transportation Dept. – Milepost log – Interstate 84
- Roadcams – Interstate 84
- David Rumsey Map Collection – Historic road map (1937) – Idaho, Montana, Wyoming – Texaco (Rand McNally)
- Idaho highway map (1956) – Shell (H.M. Gousha)