Interstate 129
Encyclopedia
Interstate 129 is an auxiliary Interstate Highway which connects South Sioux City
South Sioux City, Nebraska
-2000 Census:As of the census of 2000, there were 11,925 people, 4,304 households, and 2,961 families residing in the city. Of the 11,925 people, 48.6% are male and 51.4% are female. The population density was 2,431.6 people per square mile . There were 4,557 housing units at an average density of...

 to Interstate 29
Interstate 29 in Iowa
In the U.S. state of Iowa, Interstate 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...

 in Sioux City, Iowa
Sioux City, Iowa
Sioux City is a city in Plymouth and Woodbury counties in the western part of the U.S. state of Iowa. The population was 82,684 in the 2010 census, a decline from 85,013 in the 2000 census, which makes it currently the fourth largest city in the state....

. Opened in 1976, I-129 is a 3.48 miles (5.6 km) long route, running 3.21 miles (5.2 km) in Nebraska
Nebraska
Nebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....

. At 0.27 mile (0.4345218 km), Interstate 129 is the shortest highway in the state of Iowa. A rare characteristic of I-129 is that it is one of only four Interstates to enter a state that its parent does not enter (I-29, in this case, does not enter Nebraska
Nebraska
Nebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....

). The other three are I-275 around Cincinnati, Ohio
Cincinnati, Ohio
Cincinnati is a city in the U.S. state of Ohio. Cincinnati is the county seat of Hamilton County. Settled in 1788, the city is located to north of the Ohio River at the Ohio-Kentucky border, near Indiana. The population within city limits is 296,943 according to the 2010 census, making it Ohio's...

 since I-75
Interstate 75
Interstate 75 is a major north–south Interstate Highway in the Great Lakes and Southeastern regions of the United States. It travels from State Road 826 and State Road 924 in Hialeah, Florida to Sault Ste. Marie, Michigan, at the Ontario, Canada, border...

 does not enter Indiana
Indiana
Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

, I-287
Interstate 287
Interstate 287 is an auxiliary Interstate Highway in the U.S. states of New Jersey and New York. It is a partial beltway around New York City, serving the northern half of New Jersey and the counties of Rockland and Westchester in New York...

 around New York City
New York City
New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 because I-87
Interstate 87
Interstate 87 is a Interstate Highway located entirely within New York State in the United States of America. I-87 is the longest intrastate Interstate highway in the Interstate Highway System. Its southern end is at the Bronx approaches of the Robert F. Kennedy Bridge in New York City...

 does not enter New Jersey
New Jersey
New Jersey is a state in the Northeastern and Middle Atlantic regions of the United States. , its population was 8,791,894. It is bordered on the north and east by the state of New York, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania and on the southwest by Delaware...

, and I-535
Interstate 535
Interstate 535 is a long Interstate Highway spur route of Interstate 35 in Minnesota and Wisconsin, in the United States. It is paired with U.S...

 because I-35
Interstate 35
Interstate 35 is a north–south Interstate Highway in the central United States. I-35 stretches from Laredo, Texas, on the U.S.-Mexico border to Duluth, Minnesota, at Minnesota Highway 61 and 26th Avenue East. Many interstates used to have splits or spurs indicated with suffixed letters , but I-35...

 (located in the Duluth
Duluth
Duluth may refer to:*Duluth, Minnesota*Duluth, Georgia, a suburb of Atlanta*Duluth , an album by Trampled by Turtles*Duluth , by Gore Vidal...

-Superior
Superior
Superior may refer to:*Superior : something which is higher in a hierarchical structure of any kind-Place names:*Superior Superior may refer to:*Superior (hierarchy): something which is higher in a hierarchical structure of any kind-Place names:*Superior Superior may refer to:*Superior (hierarchy):...

 area) does not enter Wisconsin
Wisconsin
Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...

.

Route description

Interstate 129 begins along U.S. Route 20 on the western edge of South Sioux City, Nebraska
South Sioux City, Nebraska
-2000 Census:As of the census of 2000, there were 11,925 people, 4,304 households, and 2,961 families residing in the city. Of the 11,925 people, 48.6% are male and 51.4% are female. The population density was 2,431.6 people per square mile . There were 4,557 housing units at an average density of...

, just west of exit 1, a cloverleaf interchange
Cloverleaf interchange
A cloverleaf interchange is a two-level interchange in which left turns, reverse direction in left-driving regions, are handled by ramp roads...

 with U.S. Route 75 and U.S. Route 77. US 77 travels north through South Sioux City before ending at Interstate 29 in Sioux City
Sioux City, Iowa
Sioux City is a city in Plymouth and Woodbury counties in the western part of the U.S. state of Iowa. The population was 82,684 in the 2010 census, a decline from 85,013 in the 2000 census, which makes it currently the fourth largest city in the state....

 while US 75 joins I-129 and US 20. One mile (1.6 km) later, I-129 / US 20 / US 75 intersect Dakota Avenue at a partial cloverleaf interchange. U.S. Route 20 Business is designated along Dakota Avenue.

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
Jersey barrier
A Jersey barrier or Jersey wall is a modular concrete barrier employed to separate lanes of traffic. It is designed to both minimize vehicle damage in cases of incidental contact while still preventing crossover in the case of head-on accidents....

 instead of a grassy median. The three routes cross the Missouri River
Missouri River
The Missouri River flows through the central United States, and is a tributary of the Mississippi River. It is the longest river in North America and drains the third largest area, though only the thirteenth largest by discharge. The Missouri's watershed encompasses most of the American Great...

 and immediately intersect Interstate 29 at an interchange. Due to the minimum amount of space along the Missouri River
Missouri River
The Missouri River flows through the central United States, and is a tributary of the Mississippi River. It is the longest river in North America and drains the third largest area, though only the thirteenth largest by discharge. The Missouri's watershed encompasses most of the American Great...

 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
Sioux City, Iowa
Sioux City is a city in Plymouth and Woodbury counties in the western part of the U.S. state of Iowa. The population was 82,684 in the 2010 census, a decline from 85,013 in the 2000 census, which makes it currently the fourth largest city in the state....

 and I-129 ends.

History

After the passage of the Federal-Aid Highway Act
Federal-Aid Highway Act
The following bills and Acts of Congress in the United States have been known as the Federal-Aid Highway Act or similar names:*Federal Aid Road Act of 1916: July 11, 1916, ch...

 in 1968, the mileage which would eventually be manifested in over 1400 miles (2,253.1 km) of interstate highway was allocated to the states. Iowa received the smallest allocation, one half-mile (0.4 km), for the southern bypass of Sioux City
Sioux City, Iowa
Sioux City is a city in Plymouth and Woodbury counties in the western part of the U.S. state of Iowa. The population was 82,684 in the 2010 census, a decline from 85,013 in the 2000 census, which makes it currently the fourth largest city in the state....

. On the 1973 state highway map, the Iowa State Highway Commission showed the planned route on the state map for the first time. Interstate 129 was opened on November 22, 1976.

Exit list

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