Interstate 29 in Iowa

Interstate 29
Iowa's Interstate Highways with I-29 highlighted in red.
Route information
Maintained by Iowa DOT
Length:	151.826 mi (244.340 km)
Existed:	October 1, 1958 (1958-10-01) – present
History:	Under construction 1958–1972
Tourist routes:	Lewis & Clark Trail
Major junctions
South end:	I-29 near Hamburg
	US 34 / US 275 near Glenwood US 275 at Council Bluffs I-80 overlap through Council Bluffs I-480 / US 6 at Council Bluffs I-680 overlap west of Honey Creek US 30 at Missouri Valley I-129 / US 20 / US 75 at Sioux City US 77 at Sioux City
North end:	I-29 at Sioux City
Location
Counties:	Fremont Mills Pottawattamie Harrison Monona Woodbury
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Iowa Primary Highway System Interstate U.S. State Secondary Scenic ← 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.

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.