Interstate 129

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Interstate 129 overlays 3.5 miles of U.S. 20 from just west of the Lake Avenue underpass outside South Sioux City, Nebraska to the directional cloverleaf interchange joining U.S. 20/75 with I-29 in Sioux City, Iowa. U.S. 20 extends west from I-129 along an expressway another 2.5 miles beyond Crystal Lake. U.S. 20/75 encircle the eastern side of Sioux City along a freeway bypass east to Gordon Drive (U.S. 20 Business) and north to Floyd Boulevard (U.S. 75 Business). I-129/U.S. 20-75 span the Missouri River across the Sergeant Floyd Memorial Bridge. The 2,607 foot long bridge was built in 1976.1

Interstate 129 U.S. 20 East
U.S. 20 proceeds one mile east from Elgin Avenue to the cloverleaf interchange (Exit 1) with U.S. 75 south and U.S. 77 outside South Sioux City. Photo taken 06/17/15.
Milepost zero for Interstate 129 stands at the crossover preceding the Lake Avenue underpass just beyond this shield assembly along U.S. 20 eastbound. Photo taken 06/17/15.
U.S. 75 combines with U.S. 77 south from I-129/U.S. 20, 14 miles to Winnebago in Thurston County. Photo taken 06/17/15.
Exit 1A departs from I-129/U.S. 20 east for U.S. 75/77 south to the nearby Dakota/Thurston County Fairgrounds and Dakota City. Photo taken 06/17/15.
Exit 1B loops onto U.S. 77 north to South Sioux City and Downtown Sioux City, Iowa. U.S. 77 concludes in 3.4 miles at I-29 and U.S. 20 Business (Gordon Drive). Photo taken 06/17/15.
Interstate 129 U.S. 20 East U.S. 75 North
U.S. 75 combines with I-129/U.S. 20 east into Sioux City, Iowa. Photo taken 06/17/15.
The previous first shield for Interstate 129 east. Photo taken 04/20/07.
Ascending across wetland areas linking Crystal Cove and Gateway Lake, I-129/U.S. 20-75 advance a quarter mile to Exit 2 for Dakota Avenue (U.S. 20 Business). Photo taken 06/17/15.
I-129/U.S. 20-75 cross over BNSF Railroad lines leading into the parclo interchange (Exit 2) with Dakota Avenue / IBP Avenue. Photo taken 06/17/15.
Dakota Avenue north through South Sioux City is U.S. 20 Business, though the route is sparsely signed. U.S. 20 Business combines with U.S. 77 across the Missouri River into Sioux City, where it turns onto Gordon Drive east back to U.S. 20. Photo taken 06/17/15.
Continuing east from Dakota Avenue, I-129/U.S. 20-75 meet Interstate 29 in two miles. Exit numbers along I-129 reset at the Iowa state line. Photo taken 06/17/15.
The freeway bends southward across agricultural areas between G Street and the Missouri River. Photo taken 06/17/15.
The directional cloverleaf interchange (Exit 1) with Interstate 29 lies at the east end of the Sergeant Floyd Memorial Bridge. Photo taken 06/17/15.
The succeeding ramp (Exit 1A) connects with I-29 south to Sioux Gateway Airport (SUX). Photo taken 06/17/15.
Climbing onto the Sergeant Floyd Memorial Bridge across the Missouri River. Photo taken 06/17/15.
2 photos
2 photos
Trailblazers for U.S. 75 Business preceded Exit 1A for I-29 south. Established in 2002, U.S. 75 Business in Sioux City follows a combination of I-29 south, Singing Hills Boulevard east and Old Highway 75 / Lewis Boulevard north. Photos taken 04/20/07.
Interstate 129 ends within the exchange joining U.S. 20/75 with I-29. I-29 heads south to Council Bluffs and Kansas City. Photo taken 06/17/15.
Interstate 29 runs along the Missouri Riverfront northward to Downtown Sioux City en route to Sioux Falls, South Dakota. Beyond Sioux City, U.S. 20 continues to Fort Dodge and Waterloo while U.S. 75 ventures north to Le Mars. Photo taken 06/17/15.
Interstate 129 U.S. 20 West U.S. 75 South
Interstate 129 begins westbound along U.S. 20/75 within the exchange at I-29. The route however is not acknowledged until Nebraska. Photo taken 04/20/07.
I-129/U.S. 20-75 cross the Missouri River three miles south of Downtown Sioux City. Photo taken 06/17/15.
The Nebraska state line lies midway across the Sergeant Floyd Memorial Bridge. Photo taken 06/17/15.
A parclo interchange (Exit 2) joins Interstate 129 with Dakota Avenue in the city of South Sioux City in one mile. Photo taken 06/17/15.
The first of two confirming markers for I-129 west stands ahead of the C Avenue overpass. Photo taken 06/17/15.
Dakota Avenue leads north into South Sioux City as U.S. 20 Business. The bannered route is only signed at the south split with U.S. 77. Photo taken 06/17/15.
Exit 2 leaves I-129/U.S. 20-75 west for Dakota Avenue. Dakota Avenue is the historic alignment of U.S. 73/77 between Dakota City and South Sioux City. Photo taken 06/17/15.
U.S. 75 separates with I-129/U.S. 20 west at the forthcoming cloverleaf interchange (Exit 1) with U.S. 77. Photo taken 06/17/15.
2 photos
2 photos
I-129/U.S. 20-75 cross over BNSF Railroad lines and an area of wetlands south of Crystal Cove Park on the approach to U.S. 77 at Exits 1B/A. Photos taken 06/17/15.
Exit 1B departs next from I-129/U.S. 20-75 west for U.S. 77 north into South Sioux City. Photo taken 06/17/15.
U.S. 77 north ends just across the Missouri River at I-29 and U.S. 20 Business (Gordon Drive). Historically it continued west along I-29 to Iowa 12 north. Photo taken 06/17/15.
U.S. 75 combines with U.S. 77, 16 miles south from I-129/U.S. 20 (Exit 1A) to Dakota City, Homer and a roundabout at Winnebago. Photo taken 06/17/15.
The west end shield for Interstate 129 stands beyond the Lake Avenue underpass along U.S. 20. Photo taken 04/20/07.
Milepost zero for I-129 follows this mileage sign posted six miles from the village of Jackson and 18 miles southeast of the Dixon County seat of Ponca. Photo taken 06/17/15.



Photo Credits:

04/20/07, 06/17/15 by AARoads

Connect with:
Interstate 29
U.S. 20
U.S. 75

Page Updated 02-12-2020.

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