Length in Iowa: 331 miles/533 kilometers
Western terminus: Nebraska state line (Missouri
River) near Blair, NE
Eastern terminus: Illinois state line (Mississippi River) at Clinton
Entrance photos
Counties: Harrison, Crawford, Carroll, Greene, Boone, Story,
Marshall, Tama, Benton, Linn, Cedar, Clinton
Cities along route: Missouri Valley, Logan, Woodbine, Dunlap, Dow City, Arion, Denison, Vail, Westside, Carroll, Glidden, Ralston, Jefferson, Grand Junction, Beaver, Ogden, Boone, Ames, Nevada, Colo, State Center, Marshalltown, Le Grand, Toledo, Tama, Cedar Rapids, Mount Vernon, Lisbon, Mechanicsville, Stanwood, Clarence, Lowden, Wheatland, Calamus, Grand Mound, De Witt, Camanche, Clinton
NHS: Entire route
Commercial and Industrial Network: Entire route
Freeway segments:
8½ miles, from the Boone-Story County line to I-35 near Ames
About 7 miles to the south of Marshalltown
4 miles, from the junction with Business US 30 west of Toledo to L Avenue east of Tama
8 miles, between IA 100 and C Street SW in Cedar Rapids
7 miles, bypass of Mount Vernon and Lisbon
Expressway segments:
16 miles, between US 169 in Ogden and Lincoln Way west of Ames
28 miles, from I-35 east of Ames to IA 330 southwest of Marshalltown
14 miles, from the South 18th Street exit in Marshalltown to the intersection with Business US 30 west of Toledo
39 miles, from L Avenue (Business US 30) east of Tama to IA 100 west of Cedar Rapids (including a 13-mile overlap with US 218)
10 miles, from C Street SW in Cedar Rapids to Mount Vernon
17 miles between US 61 at De Witt to west of US 67 in Clinton
Exit lists:
From US 169 at Ogden to US 63 in Toledo, including the freeway segments near Ames and Marshalltown
From US 63 through Mount Vernon/Lisbon, including the freeway segment through Cedar Rapids
Multiplexes:
¼ mile with IA 37 in Dunlap. (This is a "wrong-way" concurrency where the two highways run in opposite directions.)
½ mile with US 59 and IA 141 in Denison. (IA 141 also runs in opposite directions.)
4 miles with US 169 west of Ogden
19 miles with US 218, between south-central Benton County and
I-380 in Cedar Rapids
10½ miles with US 151 (including a 4-mile triplex of US
30, 151, and 218), from the Williams Boulevard exit southwest of Cedar Rapids to the IA 13 exit
east of the Cedar River crossing
1 mile with IA 38 east of Stanwood
1 mile along the US 61 freeway west of De Witt
3½ miles with US 67 through Clinton
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Designated: October 16, 1926, replacing the former IA 6 (I)
(Lincoln Highway).
Paving history: These segments were paved at the time of designation: the segment through Greene County, the segment through Marshall County (excluding the Chicago & Northwestern railroad crossing at Linn Creek), a short segment east and north of Belle Plaine, the segment through Linn County, a segment through Mechanicsville that was bypassed by another paved segment in 1927, and the segment through Clinton County.
1927: Paved from Council Bluffs to Missouri Valley, Woodbine to Dunlap, the Marshall/Tama county line to present-day F Avenue at the Meskwaki Settlement, Tama to the Benton/Linn county line, and through Cedar County
1928: Paved from Missouri Valley to Woodbine (on a new alignment that eliminated the "stairsteps" between present-day IA 44 and Dunlap) and Montour to Tama (except for a segment near the Iowa River crossing at the Meskwaki Settlement)
1929: Paved from Dunlap to Westside (on a new alignment mostly parallel to the railroad tracks), Carroll to the Carroll/Greene county line, the Greene/Boone county line to the Des Moines River crossing, Ames to the Story/Marshall county line, from present-day F Avenue to the Iowa River crossing in Tama County, and from Meskwaki Road to Tama.
1930: Paved from Westside to Carroll (on a new alignment), from Boone to Ames, through the Chicago & Northwestern crossing near Marshalltown, and across the Iowa River at the Meskwaki Settlement (on a new alignment that opened August 21)
1931: Paved from the Des Moines River crossing through Boone
1935: Paved between IA 300 (original alignment) and Missouri Valley
1937: Last segment, between the Missouri River bridge and IA 300, paved
Major alignment changes:
August 1931: New segment bypassing Chelsea opened, creating IA 247. On August 10, it was also rerouted from 5th Street to 13th Street in Tama, taking US 30 off the historic Lincoln Highway Bridge that was built in 1915 and restored in 1987.
Also in August 1931: Re-routed west of Missouri Valley into Blair, NE, along old IA 130 (II); the old route from Missouri Valley
to Council Bluffs (following US 75) became US 30S and eventually US 30A (see below). The original bridge was replaced with the current bridge in August 1991.
October 26, 1937: Route straightened through Tama and Benton counties; the old route west of Belle Plaine became part of IA
212, and the route north of it became IA 131. The cutoff opened east of IA 21 on June 23, 1936, but US 30 would not be rerouted until the Tama County segment opened.
December 1947: Route straightened through Marshall County (with IA 64), with part of the old highway becoming IA 330 a month later.
November 10, 1953: Re-routed along 6th Street SW and a new road from the south edge of Cedar
Rapids to Lisbon (with IA 150); the old route followed Mount Vernon Road and is now signed as County Road E48 east of the city limits. The diagonal segment northwest of Mount Vernon was taken over by IA 94 and later became a relocated IA 150 before being turned over to local control.
September 25, 1954: Rerouted between Le Grand and Tama on a new alignment (with IA 64), engulfing
IA 135 (I) and creating IA 135 (II)
into Montour. The old segments are now parts of IA 146 and County Road E49.
June 13, 1955: Realigned between a point northwest of Ralston and IA 25 north of Scranton that
year; the old segment is now County Roads E39 and N65.
June 30, 1956: Re-routed along the new Gateway Bridge at Clinton; the old route through town into Illinois (over the old Lyons-Fulton Bridge) became US 30A until 1966. Tolls were collected on this bridge until December 17, 1982.
August 7, 1956: Realigned between Clarence and Calamus
September 11, 1958: Straightened between IA 25 and Grand Junction, bypassing Scranton and Jefferson along the way; the old segment is now County Road E53.
September 12, 1963: New two-lane segment opened between State Center and IA 330
October 30, 1963: New two-lane segment opened between US 65 and State Center
September 1, 1964: New two-lane segment opened between US 69 and US 65, bypassing Nevada and Colo. IA 133 (II) was created to serve Nevada after this segment opened. All of old US 30 in Boone, Story, and Marshall counties was designated as secret IA 930 afterwards, but most of the old alignment east of Ames is now County Road E41.
For street alignments in Council Bluffs, Cedar Rapids, and Clinton that are not listed here, please see their respective highway chronology pages.
Upgrades:
November 21, 1964: First expressway segment, from US 169 in Ogden to present-day 230th Street southeast of Boone, opened
1970: 10-mile expressway segment from County Road Z24 east of De Witt to a point west of US 67 in Clinton opened
December 4, 1972: Freeway/expressway segment south of Ames, from present-day 230th Street to I-35, opened. (The segment from Elwood Drive, now University Boulevard, to US 69 had been used as a temporary detour for Iowa State football traffic starting in September. Also, the Lincoln Way interchange would not be completed until sometime in 1973 due to weather delays.)
September 29, 1975: 5-mile expressway segment between US 61 at De Witt and County Road Z24 opened.
November 12, 1975: 3-mile bypass to the west and south of De Witt opened. (The old segment through De Witt was IA 948 until 1992.)
1975: 5-mile freeway/expressway segment between Bowling Street in Cedar Rapids and IA 13 south of Bertram opened
August 13, 1976: 2-mile freeway segment between US 218 (then following 6th Street SW) and Bowling Street in Cedar Rapids opened
September 23, 1981: Freeway segment between Stoney Point Road and 6th Street SW in Cedar Rapids opened (with US 218)
September 9, 1986: Freeway segment between 16th Avenue SW (old US 30) and Stoney Point Road outside of Cedar Rapids opened (with US 218)
1992: Expressway segments between I-35 and Nevada (6 miles), and from IA 201 to the end of the freeway segment near Cedar Rapids (8 miles, with US 218), opened
November 26, 1996: Freeway segment south of Marshalltown opened
October 1998: 5-mile extension of expressway segment, from Nevada to US 65 interchange at Colo, completed.
November 1999: 6-mile extension of expressway segment between the US 30/218 split and IA 201 opened (with US 218)
July 2000: 3½-mile segment from the US 30/151 split to a point three miles west of Mount Vernon opened
November 2004: 3-mile bypass of Le Grand opens to two lanes of traffic; the old segment became unsigned IA 431 (II).
June 2005: 4-mile expressway segment from the east end of the Marshalltown bypass to Le Grand (including the bypass) opens
November 17, 2005: 5-mile expressway segment from Le Grand to the Meskwaki Casino entrance west of Toledo opens
November 1, 2010: 3½-mile freeway segment from US 63 in Tama/Toledo to M Avenue east of Tama opens
November 23, 2010: 4-mile expressway segment opens to two lanes between the Meskwaki Casino entrance and US 63; it opened to all four lanes on August 15, 2011.
November 29, 2010: 7-mile expressway segment between US 65 and State Center opened
July 7, 2011: 7-mile expressway segment between State Center and IA 330 opened
November 22, 2019: 7-mile bypass of Mount Vernon and Lisbon opened. The former segment of US 30 was unsigned IA 830 until it was turned over to local jurisdictions on December 8, 2020.
August 2020: 2-mile expressway segment between 22nd Avenue and US 218 opened; a new interchange with US 218 opened September 4, 2020.
June 2, 2021: 11-mile expressway segment from Tama eastward to X Avenue opened
November 14, 2022: 3-mile expressway segment between X Avenue in Tama County and 11th Avenue in Benton County opened (the interchange with IA 21 opened August 30, 2023)
June 6, 2024: 6-mile expressway segment between County Road V44 and 22nd Avenue in Benton County opened
October 15, 2024: 5-mile expressway segment between 11th Avenue and County Road V44 opened, completing a continuous four-lane segment between Ogden and Lisbon.
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