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词条 U.S. Route 20 in Idaho
释义

  1. Route description

  2. History

  3. Junction list

  4. References

{{Use mdy dates|date=March 2017}}{{highway detail hatnote|U.S. Route 20}}{{Infobox road
|state=ID
|type=US
|route=20
|length_mi=411
|length_ref=[1]
|formed=1940[2]
|direction_a=West
|terminus_a={{jct|state=OR|US|20|US|26}} at the Oregon state line
|junction={{plainlist|1=
  • {{jct|state=ID|US|95}} in Parma
  • {{jct|state=ID|I|84}} in Caldwell
  • {{jct|state=ID|I|84}} in Garden City
  • {{jct|state=ID|I|84|US|26}} in Mountain Home
  • {{jct|state=ID|US|26}} in Carey
  • {{jct|state=ID|US|26|US|93}} in Atomic City
  • {{jct|state=ID|I|15}} in Idaho Falls }}

|direction_b=East
|terminus_b={{jct|state=MT|US|20}} at the Montana state line
|counties= Payette, Canyon, Ada, Elmore, Camas, Blaine, Butte, Bingham, Bonneville, Jefferson, Madison, Fremont
|previous_type=SH
|previous_route=19
|next_type=SH
|next_route=21
}}

U.S. Route 20 (US-20) is the portion of an east–west U.S. Highway in the state of Idaho. It begins northwest of Parma at the Oregon state line and ends at least {{convert|9.6|mi|km}} away from the Yellowstone National Park west entrance at the Montana state line.

Route description

US 20 crosses into Idaho northwest of Parma, running concurrently with US 26 and joins US 95 through Parma. US 20/US 26 leaves US 95 southeast of Parma and runs to Caldwell where US 20/US 26 joins with I-84 and US 30 for a short time. These four highways parallel each other (on two roadways) to Boise where US 20/US 26 runs through downtown before joining with I-84 and US 30 again to Mountain Home, where it departs at exit 95 to head east, past Rattlesnake Station, Anderson Ranch Dam road, and cresting at Cat Creek summit at {{convert|5527|ft}} above mean sea level. It continues into and across Camas County through Fairfield to Timmerman Junction, the intersection in Blaine County with State Highway 75, the route to Sun Valley, Galena Summit, and Stanley. US 20 continues east through Picabo and Carey, joined with US 26 and US 93, to Craters of the Moon and Arco, where US 93 splits off and turns north-northwest to climb the Big Lost River valley. US 20/US 26 continues on through the Idaho National Laboratory, where the highways split just west of Atomic City; US 26 heads to Blackfoot and US 20 to Idaho Falls, where it turns north-northeast to pass near Rexburg as a freeway. US 20 then climbs through the communities of St. Anthony, Ashton, and Island Park, and crosses the Continental Divide at Targhee Pass at {{convert|7072|ft}}, entering Montana west of West Yellowstone.

History

{{expand section|date=March 2017}}

US 20 was expanded past Yellowstone National Park in 1940.[2]

The Rigby Freeway section of US 20, extending from Idaho Falls to St. Anthony, was constructed in the 1970s. Its northernmost section still featured at-grade intersections until the 2000s, when they were replaced with full interchanges.[3]

Junction list

{{jcttop|exit|length_ref=[4]
}}{{Jctint|exit
|river=Snake River
|lspan=2
|mile=0.000
|mspan=2
|road={{Jct|state=OR|US|20|dir1=west|US|26|dir2=west|city1=Bend}}
|notes=Continuation into Oregon
}}{{jctbridge|exit
|mile=none
|bridge=Snake River Bridge; Oregon–Idaho state line
}}{{IDint|exit
|county=Payette
|location=none
|mile=1.578
|road={{jct|state=ID|US|95|city1=Fruitland}}
|espan=2
|type=concur
|notes={{ccr-end|West|US 95}}
}}{{IDint
|county=Canyon
|cspan=5
|location=none
|mile=9.647
|road={{jct|state=ID|US|95|location1=Jordan Valley}}
|type=concur
|notes={{ccr-end|East|US 95}}
}}{{IDint|exit
|location=Caldwell
|lspan=4
|mile=21.995
|mile2=22.129
|exit=26
|road={{jct|state=ID|I|84|US|30|location1=Baker City}}
|type=concur
|notes={{ccr-end|West|I-84 / US 30}}
}}{{IDint|exit
|mile=
|exit=27
|road={{jct|state=ID|BL|84|dab1=Caldwell|dir1=east|to2=to|SH|19|city1=Caldwell|city2=Wilder|city3=Homedale}}
|notes=}}{{IDint|exit
|mile=
|exit=28
|road=10th Avenue – Caldwell City Center
|notes=}}{{IDint|exit
|mile=24.840
|mile2=24.994
|exit=29
|road={{jct|state=ID|I|84|US|30|city1=Boise|city2=Twin Falls}}
|type=concur
|notes={{ccr-end|East|I-84 / US 30}}
}}{{IDint|exit
|county=Ada
|cspan=11
|location=none
|mile=34.267
|espan=3
|road={{jct|state=ID|SH|16|city1=Emmett}}
}}{{IDint
|location=Boise
|lspan=7
|mile=40.229
|road={{jct|state=ID|SH|55|city1=Caldwell|city2=Eagle}}
}}{{IDint
|mile=44.166
|road={{jct|state=ID|SH|44|city1=Eagle}}
}}{{IDint|exit
|mile=47.300
|exit=—
|road={{jct|state=ID|I|184|dir1=west|to2=y|I|84}}
|notes=I-184 exit 3
}}{{IDint|exit
|mile=48.050
|road=River Street
|exit=—
|notes=Eastbound exit only
|type=incomplete
}}{{IDint|exit
|mile=51.975
|exit=—
|road=South Federal Way
|notes=Interchange
}}{{IDint|exit
|mile=52.560
|mile2=52.664
|exit=54
|road={{jct|state=ID|I|84|US|30|city1=Caldwell}}
|type=concur
|notes={{ccr-end|West|I-84 / US 30}}
}}{{IDint|exit
|mile=
|exit=57
|road={{jct|state=ID|SH|21|name1=Gowen Road|city1=Idaho City}}
|notes=Exit for South Federal Way}}{{IDint|exit
|location=none
|mile=
|exit=59
|road=South Eisenman Road Interchange
|notes=Signed as exits 59A (South Eisenman IC) and 59B (Memory Road) eastbound}}{{IDint|exit
|location=none
|mile=
|exit=64
|road=Blacks Creek Road – Kuna
|notes=}}{{IDint|exit
|location=none
|mile=
|exit=71
|road=Orchard, Mayfield
|notes=}}{{IDint|exit
|county=Elmore
|cspan=3
|location=none
|mile=
|exit=74
|road=Simco Road
|notes=}}{{IDint|exit
|location=none
|mile=
|exit=90
|road={{jct|state=ID|BL|84|dab1=Mountain Home|dir1=east|to2=to|SH|51|SH|67|city1=Mountain Home|city2=Bruneau}}
|notes=}}{{IDint|exit
|location=Mountain Home
|mile=95.066
|mile2=95.307
|exit=95
|road={{jct|state=ID|I|84|US|26|US|30|SH|51|city1=Bliss|city2=Twin Falls}}
|type=concur
|notes={{ccr-end|East|I-84 / US 26 / US 30}}
}}{{IDint|exit
|county=Camas
|location=Fairfield
|road={{jct|state=ID|SH|46|city1=Gooding|city2=Wendell}}
}}{{IDint|exit
|county=Blaine
|cspan=2
|location=none
|road={{jct|state=ID|SH|75|city1=Shoshone|city2=Challis}}
}}{{IDint|exit
|location=Carey
|road={{jct|state=ID|US|26|US|93|city1=Bliss|city2=Twin Falls}}
|type=concur
|notes={{ccr-end|West|US 26 / US 93}}
}}{{IDint|exit
|county=Butte
|cspan=3
|location=Arco
|road={{jct|state=ID|US|93|city1=Challis}}
|type=concur
|notes={{ccr-end|East|US 93}}
}}{{IDint|exit
|location=Butte City
|road={{jct|state=ID|SH|33|city1=Howe}}
}}{{IDint|exit
|location=Atomic City
|road={{jct|state=ID|US|26|city1=Idaho Falls}}
|type=concur
|notes={{ccr-end|East|US 26}}
}}{{jctco|state=ID|county=Bingham}}{{IDint|exit
|county=Bonneville
|cspan=10
|location=Idaho Falls
|lspan=6
|mile=
|exit=118
|road={{jct|state=ID|I|15|BL|15|US-Bus|20|dab2=Idaho Falls|dab3=Idaho Falls|city1=Pocatello}}
|type=concur
|notes={{ccr-end|West|I-15}}
}}{{IDint|exit
|mile=
|exit=119
|road={{jct|state=ID|I|15|extra=airport|location1=Butte}}
|type=concur
|notes={{ccr-end|East|I-15}}; access to Idaho Falls Regional Airport; west end of freeway via partial Interstate-standard interchange
}}{{IDint|exit
|road=Lindsay Boulevard
}}{{jctbridge|exit
|bridge=Bridge over the Snake River}}{{IDint|exit
|road=Fremont Avenue
}}{{IDint|exit
|road=Science Center Drive
|type=incomplete
|notes=Eastbound exit and westbound entrance
}}{{IDint|exit
|location=none
|road={{jct|state=ID|US-Bus|20|name1=Holmes Avenue|dab1=Idaho Falls|city1=Idaho Falls}}
}}{{IDint|exit
|location=Orvin
|road=Saint Leon Road
}}{{IDint|exit
|location=none
|road=North 25th East
}}{{IDint|exit
|location=Ucon
|road={{jct|state=ID|SH|43|name1=105th North|city1=Beachs Corner}}
}}{{IDint|exit
|county1=Bonneville
|county2=Jefferson
|location=none
|road=County Line Road
}}{{IDint|exit
|county=Jefferson
|cspan=3
|location=Rigby
|lspan=2
|road={{jct|state=ID|SH|48|city1=Menan|city2=Ririe}}
|type=incomplete
|notes=Eastbound exit and westbound entrance
}}{{IDint|exit
|road=Farnsworth Way / Yellowstone Highway
}}{{IDint|exit
|location=Lorenzo
|road=Yellowstone Highway / East 700 North
|notes=Interchange; east end of freeway
}}{{IDint|exit
|county=Madison
|cspan=5
|location=Rexburg
|lspan=3
|road=University Boulevard
|notes=Interchange
}}{{IDint|exit
|road={{jct|state=ID|SH|33|city1=Driggs}}
|notes=Interchange
}}{{IDint|exit
|road=North 2nd East
|notes=Interchange
}}{{IDint|exit
|location=Sugar City
|lspan=2
|road=Center Street
|type=incomplete
|notes=Interchange; eastbound exit and westbound entrance
}}{{IDint|exit
|road=9th North
|notes=Interchange
}}{{IDint|exit
|county=Fremont
|cspan=4
|location=Saint Anthony
|lspan=2
|road=Bridge Street
|notes=Interchange
}}{{IDint|exit
|road={{jct|state=ID|US-Bus|20|dab1=Saint Anthony|city1=Saint Anthony}}
}}{{IDint|exit
|location=Ashton
|road={{jct|state=ID|SH|47|city1=Marysville}}
}}{{IDint|exit
|location=Henrys Lake
|road={{jct|state=ID|SH|87|extra=airport}}
|notes=Access to Henrys Lake Airport
}}{{Jctplace|exit
|river=Targhee Pass
|lspan=2
|mile=
|mspan=2
|place=Idaho–Montana state line
}}{{MTint|exit
|mile=none
|road={{jct|state=MT|US|20|dir1=east|city1=West Yellowstone}}
|notes=Continuation into Montana
}}{{jctbtm|exit|keys=concur,incomplete}}

References

1. ^{{google maps |title=Snake River to Yellowstone National Park|url=https://www.google.com/maps/dir/43.8769625,-116.9838711/43.496621,+-112.098217/Yellowstone+National+Park/@43.6087197,-116.20201,15z/data=!4m38!4m37!1m25!3m4!1m2!1d-116.3219898!2d43.6612966!3s0x54ae5571f06f7e13:0xceb961811dd41a38!3m4!1m2!1d-116.1952599!2d43.6068989!3s0x54aef8f891bc7eb5:0x6b6f0b271fcffbc7!3m4!1m2!1d-116.1885657!2d43.6018357!3s0x54aef8515cc34b15:0x64093aaf8bc0514b!3m4!1m2!1d-116.1935443!2d43.5982936!3s0x54aef85a9537bb69:0x8681471507c12f14!3m4!1m2!1d-113.5423774!2d43.4803583!3s0x54aa1235cc86b08d:0x37f7db115d807e56!1m3!2m2!1d-112.098217!2d43.496621!1m5!1m1!1s0x5351e55555555555:0xaca8f930348fe1bb!2m2!1d-110.588455!2d44.427963!3e0|accessdate=February 29, 2016}}
2. ^1 {{cite web | url=http://www.fhwa.dot.gov/infrastructure/longest.cfm | title=Ask the Rambler: What Is the Longest Road in the United States? | publisher=Federal Highway Administration | date=October 17, 2013 | accessdate=December 4, 2014 | last=Weingroff |first= Richard }}
3. ^{{cite news |date=November 18, 2016 |title=Thornton Interchange opens, U.S. 20 improvements now complete |url=https://www.eastidahonews.com/2016/11/thornton-interchange-opens-u-s-20-improvements-now-complete/ |publisher=East Idaho News |accessdate=July 16, 2018}}
4. ^{{cite web|title=Milepoint Log — State Highway System|url=http://itd.idaho.gov/highways/milepointlog/logs/usHW/US_20_MPLog.pdf|publisher=Idaho Transportation Department|accessdate=April 15, 2016}}
{{state detail page browse|type=US|route=20|statebefore=Oregon|state=Idaho|stateafter=Montana}}

15 : United States Numbered Highways|U.S. Highways in Idaho|U.S. Route 20|Transportation in Payette County, Idaho|Transportation in Canyon County, Idaho|Transportation in Ada County, Idaho|Transportation in Elmore County, Idaho|Transportation in Camas County, Idaho|Transportation in Blaine County, Idaho|Transportation in Butte County, Idaho|Transportation in Bingham County, Idaho|Transportation in Bonneville County, Idaho|Transportation in Jefferson County, Idaho|Transportation in Madison County, Idaho|Transportation in Fremont County, Idaho
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