Interstate 129
Route information | ||||||
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Auxiliary route of I-29 | ||||||
Length | 3.50 mi[1][2] (5.63 km) Nebraska: 3.21 mi (5.17 km) Iowa: 0.286 mi (460 m) | |||||
Existed | November 22, 1976[3]–present | |||||
NHS | Entire route | |||||
Major junctions | ||||||
West end | US 20 in South Sioux City, Nebraska | |||||
US 75 / US 77 in South Sioux City, Nebraska | ||||||
East end | I-29 / US 20 / US 75 in Sioux City, Iowa | |||||
Location | ||||||
Country | United States | |||||
States | ||||||
Counties | ||||||
Highway system | ||||||
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Interstate 129 (I-129) is an auxiliary Interstate Highway which connects South Sioux City, Nebraska, to I-29 in Sioux City, Iowa. Opened in 1976, I-129 is a 3.5-mile-long (5.6 km) route, running 3.21 miles (5.17 km) in Nebraska. At 0.286 miles (0.460 km), I-129 is the shortest highway in the state of Iowa. All of the route's length is concurrent with U.S. Route 20 (US 20) and most of its length is concurrent with US 75.
Route description
I-129 begins along
East of Dakota Avenue, I-129/US 20/US 75 travels south of South Sioux City and passes through rolling farmland. For the rest of I-129's length, the two directions of I-129/US 20/US 75 traffic are separated by a Jersey barrier instead of a grassy median. The three routes cross the Missouri River and immediately intersect I-29 at an interchange. Due to the minimum amount of space along the Missouri River banks, the I-29 interchange is a modified two-level cloverstack interchange. At I-29, US 20 and US 75 continue east around Sioux City and I-129 ends.[4]
History
After the passage of the
Exit list
State | County | Location | mi[1][2] | km | Exit | Destinations | Notes |
---|---|---|---|---|---|---|---|
Nebraska | Dakota | Covington Precinct | 0.00 | 0.00 | US 20 west | Western end of US 20 concurrency; continuation beyond western terminus | |
0.38– 0.40 | 0.61– 0.64 | 1 | US 75 south / US 77 – Fair Grounds, Sioux City | Western end of US 75 concurrency; signed as exits 1A (south) & 1B (north) | |||
US 20 Bus. east) – South Sioux City, Dakota City | Western terminus of US 20 Bus. | ||||||
Missouri River | 3.21 0.000 | 5.17 0.000 | Sergeant Floyd Memorial Bridge; Nebraska–Iowa line | ||||
US 75 Bus. north – Council Bluffs, Sioux Gateway Airport , Downtown Sioux City | Eastern end of US 20 and US 75 concurrencies; eastern terminus of I-129; southern terminus of US 75 Bus.; signed as exits 1A (south) and 1B (north); I-29 exits 144A-B | ||||||
US 20 east / US 75 north – Fort Dodge, Le Mars | Continuation beyond I-29 | ||||||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References
- ^ a b c "Nebraska Highway Reference Log Book" (PDF). Nebraska Department of Roads. 2015. p. 270. Retrieved January 8, 2017.
- ^ ESRI shapefile). Ames: Iowa Department of Transportation. April 9, 2021. Retrieved April 18, 2021.
- ^ a b Iowa Department of Transportation. The National System of Interstate Defense Highways: 1956–1996.
- ^ Google (February 27, 2010). "Interstate 129" (Map). Google Maps. Google. Retrieved February 27, 2010.
- ^ Federal Highway Administration. "FHWA By Day - December 13". Retrieved August 1, 2010.
- ^ Iowa State Highway Commission (1973). State of Iowa Transportation Map (PDF) (Map). Ames: Iowa State Highway Commission. Sioux City inset. Retrieved August 1, 2010.
Browse numbered routes | ||||
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← IA | → Iowa 130 | |||
← NE | → N-133 |