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Interstate 29 in Iowa

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This article is about the section of Interstate 29 in Iowa. For the entire route, see Interstate 29.

Interstate 29 marker

Interstate 29
I-29 follows the western border of Iowa
Iowa's Interstate Highways with I-29 highlighted in red.
Route information
Maintained by Iowa DOT
Length: 151.826 mi[2] (244.340 km)
Existed: October 1, 1958 (1958-10-01)[1] – present
History: Under construction 1958–1972
Lewis & Clark Trail
Major junctions
South end: I-29 near Hamburg
North end: I‑29 at Sioux City
Highway system
Iowa 28 US 30

In the U.S. state of Iowa, Interstate 29 (I-29) is a north–south Interstate Highway which closely parallels the Missouri River. I-29 enters Iowa from Missouri near Hamburg and heads to the north-northwest through the Omaha-Council Bluffs and the Sioux City areas. It exits the state by crossing the Big Sioux River into South Dakota. For its entire distance through the state, it runs on the flat land between the Missouri River and the Loess Hills.

I-29 was built in sections over a period of 15 years. When there was a shortage of male workers, female workers stepped in to build a twenty-mile (32 km) section near Missouri Valley. Between Council Bluffs and Sioux City, I-29 replaced U.S. Route 75 (US 75) as the major route in western Iowa. As a result of I-29's creation, US 75 south of Sioux City was relocated into Nebraska.

Route description[edit]

Interstate 29 enters Iowa south of Hamburg. The interstate heads northwest, where it meets Iowa Highway 333 (Iowa 333) at a diamond interchange. From Hamburg, I-29 continues to the northwest for seven miles (11 km) where it meets Iowa 2 three miles (4.8 km) east of Nebraska City, Nebraska. North of the Iowa 2 interchange, the interstate straightens out to the north; interchanges serving Percival, Thurman, and Bartlett are spaced out every four and a half miles (7.2 km). At the US 34 interchange near Glenwood, I-29 is joined by US 275.[2]

Steep hills loom over a cornfield.
The Loess Hills flank Interstate 29 to the east.

North of Glenwood, I-29 / US 275 continue north towards Council Bluffs. The two routes meet Iowa 370, which crosses into Nebraska providing access to Offutt Air Force Base in Bellevue, Nebraska. Near Lake Manawa, US 275 splits away from I-29 at the Iowa 92 interchange. three-quarters mile (1.2 km) north of the split, the interstate is joined from the east by Interstate 80. The two interstates head west together through southern Council Bluffs for three miles (4.8 km). When the two interstates split at a Y interchange, I-80 immediately crosses the Missouri River into Nebraska, and I-29 immediately turns to the north. Two miles (3.2 km) to the north is a modified Y interchange with US 6 and the eastern end of I-480.[2]

North of Council Bluffs, I-29 is joined by I-680 near Crescent. The two interstates travel north together for nine miles (14 km) before I-680 splits off to the east near Loveland. I-29 continues north for four miles (6.4 km) to Missouri Valley, where it intersects US 30. North of Missouri Valley, the interstate turns to the northwest towards Modale and then straightens out again south of Mondamin, where I-29 meets the western end of Iowa 127. From Mondamin, it travels north for 23 miles (37 km) to the Iowa 175 interchange at Onawa, passing Little Sioux and Blencoe.[2]

A major highway crosses a minor river which flows into a large river.
Interstate 29 closely parallels the Missouri River in Sioux City.

North of Onawa, I-29 continues northwest for fifteen miles (24 km) towards Sloan, where it meets the western end of Iowa 141. As it approaches the Sioux City metro area, it passes the Sioux Gateway Airport at Sergeant Bluff. At the Singing Hills Boulevard interchange, northbound is joined by southbound U.S. Route 75 Business (US 75 Bus.). One mile (1.6 km) later, US 75 Bus. ends at the cloverleaf interchange with US 20 / US 75, which is also the eastern end of Interstate 129.[2]

For the next three miles (4.8 km) north of the I-129 interchange, I-29 runs closely, as close as 200 feet (61 m), to the Missouri River. The interstate follows the curve of the river and turns to the west. It meets Gordon Drive, which carries US 20 Bus. US 20 Bus. traffic is directed onto the interstate for one-half mile (0.80 km) before it exits via a volleyball interchange which represents the national northern end of U.S. Route 77.[2] I-29 continues west along the Missouri River, and after the Big Sioux River converges into the Missouri, I-29 follows the Big Sioux. Shortly before it crosses the Big Sioux into South Dakota, Iowa 12 splits away to the north.[3]


Interchange with 680 looking toward the Mormon Bridge in Council Bluffs on June 16, 2011 during the 2011 Missouri River floods

Construction of Interstate 29 began in the late 1950s in the Sioux City area. The first section to open, a three-mile-long (4.8 km) stretch from the Big Sioux River to the then-US 20 / US 77 bridge across the Missouri River, opened around October 1, 1958. In September 1961, I-29 was extended across the Big Sioux River to South Dakota. On April 1, 1962, some of the northbound directional spans collapsed into the Big Sioux River at the South Dakota state line as a result of flooding and bridge scour.[4][5][6]

North of Council Bluffs, a twenty-mile (32 km) section to Missouri Valley opened in November 1958. By December 1967, the two sections were connected, creating 100 miles (160 km) of continuous interstate highway.[1] Due to a shortage of male workers, at least 20 women were enlisted to help build this section of I-29. The women were paid $2.00 hourly ($14.00 hourly in 2015 dollars[7]), the same wage as men would have earned.[8]

Construction of I-29 in the Council Bluffs area was completed in 1970 and the route was open to Glenwood in the same year. Additional interchanges were added in the Sioux City and Council Bluffs areas between 1970 and 1971. The last thirty miles (48 km) of interstate were constructed and opened in sections over the next two years; the last section opened on December 15, 1972.[1]

In 1973, US 34 was expanded to four lanes near Glenwood, which resulted in US 34 being rerouted onto I-29 for three miles (4.8 km).[1] In 2003, US 275 was rerouted onto I-29 from the same interchange near Glenwood northward to Iowa 92 at Council Bluffs. The former US 275 alignment was turned over to Mills and Pottawattamie Counties.[9]

Much of I-29 was built next to existing highways, most notably US 75. When the section of I-29 opened between Council Bluffs and Missouri Valley, US 75 was rerouted onto I-29.[10] When construction connecting the Sioux City and Council Bluffs segments was completed, US 75 was again rerouted onto I-29.[11] In the mid-1980s, US 75, from Council Bluffs to Sioux City, was completely rerouted out of Iowa, instead extending up the former US 73 corridor in Nebraska.[12]

Exit list[edit]

County Location mi[2] km Exit[13] Destinations Notes
Fremont Washington Township 0.000 0.000 I-29 south – St. Joseph, Kansas City Continuation into Missouri
1.811 2.915 1 Iowa 333 east – Hamburg
Benton Township 10.144 16.325 10 Iowa 2 – Sidney, Nebraska City
15.458 24.877 15 CR J26 – Percival
Scott Township 19.917 32.053 20 CR J24 – McPaul, Thurman Formerly Iowa 145
24.447 39.344 24 CR L31 (To CR J10) – Bartlett, Tabor
Mills Plattville Township 32.386 52.120 32 Pacific Junction, Plattsmouth Formerly US 34
35.477 57.095 35 US 34 / US 275 south – Glenwood, Red Oak South end of US 275 overlap
Saint MarysOak
township line
43.805 70.497 42 CR H10 – Offutt Air Force Base Formerly Iowa 370
Pottawattamie Council Bluffs 47.865 77.031 47 US 275 north / Iowa 92 – Lake Manawa North end of US 275 overlap
48.526 78.095 48 I-80 east – Des Moines South end of I-80 overlap
49.230 79.228 3 Iowa 192 north (South Expressway) – Council Bluffs, Lake Manawa
50.683 81.566 1B S. 24th Street
51.644 83.113 51 I-80 west – Omaha North end of I-80 overlap
52.378 84.294 52 Nebraska Avenue
53.199 85.615 53A 9th Avenue, Harrah's Boulevard
53.777 86.546 53B I-480 west – Omaha Northbound left exit; no exit to US 6 east; serves Eppley Airfield
54.204 87.233 54A Avenue G Southbound exit and entrance only
54.623 87.907 54B N. 35th Street Northbound exit and entrance only
55.715 89.665 55 N. 25th Street
56.917 91.599 56 Iowa 192 south – Council Bluffs Southbound left exit and northbound entrance only
Crescent Township 61.966 99.725 61 I-680 west / CR G37 east – Crescent, North Omaha South end of I-680 overlap; signed as exits 61A (east) and 61B (west)
township line
66.465 106.965 66 Honey Creek
Rockford Township 71.623 115.266 71 I-680 east – Des Moines North end of I-680 overlap
71.988 115.853 72 Loveland Pottawattamie CR G12 (west) and CR G14 (east)
Harrison Missouri Valley 75.786 121.966 75 US 30 – Missouri Valley, Blair
Taylor Township 82.088 132.108 82 CR F50 – Modale
Morgan Township 89.309 143.729 89 Iowa 127 east – Mondamin
Little Sioux Township 95.714 154.037 95 CR F20 – Little Sioux
Monona Sherman Township 105.347 169.540 105 CR K45 – Blencoe
Onawa 112.326 180.771 112 Iowa 175 – Onawa, Decatur
township line
120.210 193.459 120 CR E24 – Whiting
Woodbury Sloan Township 127.571 205.306 127 Iowa 141 east – Sloan
Salix 133.970 215.604 134 Salix (CR K25)
135.708 218.401 135 Port Neal Landing (CR D51)
Sergeant Bluff 141.194 227.230 141 CR D38 – Sergeant Bluff, Sioux Gateway Airport
Sioux City 143
US 75 Business (Singing Hills Boulevard)
144.473 232.507 144 I-129 west / US 20 / US 75 – Le Mars, Fort Dodge, South Sioux City Signed as exits 144A (east/north) and 144B (west/south)
147.476 237.340 147A Floyd Boulevard
148.050 238.263 147B
US 20 Business (Gordon Drive)
148.493 238.976 148
US 20 Business (Wesley Parkway) / US 77 south – South Sioux City, Nebr.
Northbound exit only
149.081 239.923 149
US 20 Business (Wesley Parkway) / US 77 south / Hamilton Boulevard – South Sioux City, Nebr.
Southbound exit only for US 20 Business / US 77
151.365 243.598 151 Iowa 12 north (Riverside Boulevard) – Akron
Big Sioux River 151.826 244.340 Iowa–South Dakota state line
Union Dakota Dunes I‑29 north – Sioux Falls Continuation into South Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b c d Completion Map of Interstate System (PDF) (Map). Iowa Department of Transportation. January 1, 1982. Retrieved September 8, 2010. 
  2. ^ a b c d e f g "2009 Volume of Traffic on the Primary Road System of Iowa" (PDF). Iowa Department of Transportation. January 1, 2009. Retrieved September 8, 2010. 
  3. ^ Sioux City, Iowa (PDF) (Map). Iowa Department of Transportation. 2010. Retrieved September 8, 2010. 
  4. ^ "Rain, storms follow weekend of storms; stir fears of floods". Lodi News-Sentinel. United Press International. April 2, 1962. p. 5. Retrieved January 29, 2015. 
  5. ^ "I-29 bridge collapse". Sioux City Journal. April 22, 2012. Retrieved January 29, 2015. 
  6. ^ Richardson, E. V.; Lagasse, P. F. (1999). Stream Stability and Scour at Highway Bridges. American Society of Civil Engineers. p. 57. 
  7. ^ Consumer Price Index (estimate) 1800–2014. Federal Reserve Bank of Minneapolis. Retrieved February 27, 2014.
  8. ^ "Can't get men, paving contractor is hiring women". Toledo Blade. Associated Press. October 13, 1967. p. 5. Retrieved September 8, 2010. 
  9. ^ Iowa State Highway Map (PDF) (Map). Iowa Department of Transportation. 2004. § B2. Retrieved September 8, 2010. 
  10. ^ Iowa State Highway Map (PDF) (Map). Iowa State Highway Commission. 1959. § L2:M3. Retrieved September 8, 2010. 
  11. ^ Iowa State Highway Map (PDF) (Map). Iowa State Highway Commission. 1969. § G1:L3. Retrieved September 8, 2010. 
  12. ^ Iowa State Highway Map (Map). Iowa Department of Transportation. 1985. § A5:B3. 
  13. ^ Transportation Map (PDF) (Map). Iowa Department of Transportation. 2010. Retrieved September 8, 2010. 

External links[edit]

Route map: Bing

Interstate 29
Previous state:
Iowa Next state:
South Dakota