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| Iowa 1 (I) |
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Designated: July 1, 1920 Decommissioned: October 16, 1926 Original northern terminus: Minnesota state line north of Northwood Original southern terminus: Missouri state line south of Lamoni Paving history: At the time of designation, the segment through Mason City and from Des Moines to Fort Des Moines were paved. Major alignment changes: On February 25, 1924, IA 1 was straightened between Sheffield and Hampton; the old alignment followed what is now County Road S43. Replaced by: US 65 north of Leon, and US 69 south of Leon. This number was assigned to the Jefferson Highway through central Iowa, running through Mason City, Iowa Falls, Ames, and Des Moines, when the state began numbering highways in 1920. It was reassigned when the US highway system began in late 1926. For a map of its estimated street alignment through Des Moines in 1925, see the Highways of Des Moines page. |
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Iowa 1 |
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Length: 120 miles/193 kilometers Northern terminus: US 151 southwest of Anamosa Southern terminus: IA 2 south of Keosauqua Terminus photos Counties: Jones, Linn, Johnson, Washington, Keokuk, Jefferson, Van Buren Cities along route: Martelle, Mount Vernon, Solon, Iowa City, Kalona, Washington, Brighton, Fairfield, Birmingham, Keosauqua NHS: From I-80 to US 218 in Iowa City Multiplexes: |
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| History | |
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Designated: October 16, 1926, along a segment of IA 11 between US 32 (now US 6) in Iowa City and IA 3 (now IA 2) Paving history: There were no paved segments at designation. Major alignment changes: |
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| Notes | |
| IA 1 was supposed to become the first highway to be reconstructed into a "Super-2," which in Iowa are two-lane roads with wider lanes and shoulders, fewer intersections, and more turn lanes, but plans to reconstruct the 18 miles between US 30 and I-80 and the 29 miles between Washington and US 218 were removed from the five-year plan in late 2001 as a result of funding shortages. |
| Iowa 2 (I) |
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Designated: July 1, 1920 Decommissioned: February 1, 1939 Original western terminus: Nebraska state line (Missouri River) at Council Bluffs; it was truncated at Oskaloosa on October 16, 1926, and replaced IA 24 (I) between Lewis and Oskaloosa on August 9, 1927. Original eastern terminus: Illinois state line (Mississippi River) at Davenport; it was truncated at Grandview on October 16, 1926, and extended along US 61 to Muscatine on January 7, 1931. Paving history: At the time of designation, the only paved segment was from Columbus Junction to Fredonia. Major alignment changes: Replaced by: The original IA 2 was assigned to the Great White Way between Council Bluffs and Davenport via Atlantic, Des Moines, Pella, Oskaloosa, Washington, and Muscatine. It was originally known as the White Pole Road, named for its white-painted poles, in 1910 and was renamed the Great White Way when it became Iowa's first registered auto trail on July 20, 1914. In recent years the White Pole Road Development Corporation has promoted the former IA 925 as the White Pole Road, complete with utility poles that have been painted white. The association has a more comprehensive history of the White Pole Road here. For a map of its estimated street alignment in Council Bluffs in 1924, see Jeff Morrison's Council Bluffs/Omaha Highway Chronology page. For a map of its street alignment in Des Moines in 1925, see the Highways of Des Moines page. For a map of its street alignment in Davenport in 1924, see the Highways of Davenport and Bettendorf page. |
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Iowa 2 |
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Length: 258 miles/415 kilometers Western terminus: Nebraska state line (Missouri River) near Nebraska City, NE; continuation of NE 2 Eastern terminus: Illinois state line (Mississippi River) at Fort Madison; continues as IL 9 Terminus photos Counties: Fremont, Page, Taylor, Ringgold, Decatur, Wayne, Appanoose, Davis, Van Buren, Lee Cities along route: Sidney, Shenandoah, Clarinda, New Market, Bedford, Benton, Mount Ayr, Kellerton, Decatur City, Leon, Corydon, Promise City, Centerville, Bloomfield, Pulaski, Milton, Cantril, Farmington, Donnellson, Fort Madison Expressway segment: 3 miles, between the Nebraska state line and I-29 NHS: Along the expressway segment Multiplexes: |
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| History | |
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Designated: November 3, 1941, along the former IA 3 (I) through
southern Iowa Paving history: At the time of designation, IA 2 was paved from the Nebraska state line to Mount Ayr, from a point west of Kellerton to the Ringgold/Decatur county line, and from Leon to Fort Madison. Major alignment changes: Upgrades: |
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| Notes | |
| Although an "END IA 2" sign can be seen near the foot of the Fort Madison toll bridge (after a long duplex with US 61) with "TO IL 9/IL 96" trailblazer signs at the intersection, route logs (and most maps) show IA 2 ending at the Iowa/Illinois border and continuing as IL 9. | |
| Business IA 2 | |
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| Iowa 3 (I) |
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Designated: July 1, 1920 Decommissioned: November 3, 1941 Original western terminus: Nebraska state line (Missouri River) near Nebraska City, NE Original eastern terminus: Illinois state line (Mississippi River) at Burlington; it was truncated at Fort Madison on November 3, 1924, eliminating a redundant multiplex with IA 20 (I). On January 6, 1925, it was truncated to the west junction with IA 20, now US 61, west of Fort Madison but was re-extended to the state line by 1936. Paving history: There were no paved segments at designation. Major alignment change: In 1930 it was realigned between the Missouri River and Sidney, creating a duplication with IA 4 (now US 275); part of the old road followed present-day County Road J34. In addition, the bridge to Nebraska City, NE, was dedicated on October 17, 1930. Replaced by: IA 2 (at decommissioning) |
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Iowa 3 |
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Length: 328 miles/528 kilometers Western terminus: South Dakota state line (Big Sioux River) near Westfield; continuation of SD 50 Eastern terminus: US 61/151 in Dubuque Terminus photos Counties: Plymouth, Cherokee, Buena Vista, Pocahontas, Humboldt, Wright, Franklin, Butler, Bremer, Fayette, Clayton, Delaware, Dubuque Cities along route: Akron, Le Mars, Remsen, Marcus, Cleghorn, Meriden, Cherokee, Pocahontas, Gilmore City, Humboldt, Dakota City, Goldfield, Clarion, Rowan, Hampton, Dumont, Allison, Shell Rock, Waverly, Oelwein, Strawberry Point, Edgewood, Colesburg, Luxemburg, Holy Cross, Rickardsville, Durango, Sageville, Dubuque Multiplexes: |
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| History | |
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Designated: June 22, 1945, along segments of IA 5 (I) (Akron to a point east of Cherokee, co-signed until 1962), IA 221 (II) (a point east of Cherokee to Pocahontas), and IA 10 (Pocahontas to Dubuque). Paving history: At the time of designation, the segments from Le Mars to IA 5 (now 7) east of Cherokee, from Pocahontas to a point near the IA 38 junction, and from Colesburg to Dubuque were paved. Major alignment changes: |
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| Iowa 4 (I) |
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Designated: July 1, 1920 Decommissioned: January 1, 1969 Original northern terminus: Minnesota state line northeast of Spirit Lake. It was truncated at Early on October 16, 1926; extended to Storm Lake along a new alignment on January 8, 1931; truncated at US 71 on November 7, 1934 (sharing part of IA 35 east of Odebolt and sharing US 71 to the present-day junction with US 20 near Early) and truncated at the relocated US 71 in Sac County on April 4, 1935. It may have been truncated at Odebolt sometime after 1957 to eliminate the redundant multiplex with IA 175 (originally IA 35 (I)). Original southern terminus: Hamburg. An extension to the Missouri state line to connect with MO 1 was approved on July 9, 1928. It was moved to IA 48 at Shenandoah in November 1931 (approved October 27) and it replaced a segment of that highway to the Missouri border on November 25, 1931. It was truncated at Denison in April 1934. Paving history: There were no paved segments at designation. Major alignment changes: IA 4 was rerouted between Macedonia and Hastings in July 1930, creating IA 177 (I) to serve Carson. Replaced by: |
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Iowa 4 |
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Length: 146 miles/235 kilometers Northern terminus: Minnesota state line north of Estherville; continuation of MN 4 Southern terminus: IA 44 in Panora Terminus photos Counties: Emmet, Palo Alto, Pocahontas, Calhoun, Greene, Guthrie Cities along route: Estherville, Wallingford, Graettinger, Mallard, Pocahontas, Pomeroy, Rockwell City, Lohrville, Churdan, Jefferson, Panora Multiplexes: |
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| History | |
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Designated: January 1, 1969, replacing IA 17 (I). Paving history: The entire road was paved at the time of designation. |
| Iowa 5 (I) |
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Designated: July 1, 1920 Decommissioned: January 1, 1969 Original western terminus: Nebraska state line (Missouri River) at Sioux City; it was truncated at Le Mars on October 16, 1926, and extended westward to Akron on February 4, 1929, replacing IA 27 (I). In 1962 it was truncated west of the IA 3 junction north of Aurelia; it had shared a 60-mile segment of IA 3 between Akron and this junction upon IA 3's designation in 1945. Original eastern terminus: Illinois state line (Mississippi River) at Dubuque; it was truncated at Fort Dodge on October 16, 1926. Paving history: At the time of designation, the segment from Cedar Falls to Waterloo was the only paved segment. Major alignment changes: In 1931 it was realigned along a new gravel road between a point south of Marcus and Cherokee to serve Cleghorn and Meriden (two towns that were previously served by IA 145 (I) and IA 33 (I) respectively). Replaced by: Note: State highway maps prior to 1926 showed that IA 5 and IA 40 (I) had run on different alignments between Cedar Falls and Waterloo than US 20 and 218 did, with IA 5 running south of the Cedar River. However, the Highway Commission's Service Bulletin for the fall of 1925 noted that US 20 would replace the entire route of IA 5 east of Fort Dodge, but US 20 was routed north of the Cedar River. Waterloo's request to have US 20 run south of the Cedar was denied at a Highway Commission meeting on December 14, 1926; however, it is unknown at this point whether IA 5 and 40 switched routes before the US highways were signed. For a map of its 1925 street alignment in Sioux City, see Jeff Morrison's Sioux City Highway Chronology page. For alignment changes in Fort Dodge that are not listed here, see Jeff Morrison's Fort Dodge Highway Chronology page. For a map of its 1925 street alignment in Cedar Falls and Waterloo, see Jeff Morrison's Waterloo/Cedar Falls Highway Chronology page. |
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Iowa 5 |
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Length: 105 miles/169 kilometers Northern terminus: I-35 (exit 68) south of West Des Moines Southern terminus: Missouri state line south of Cincinnati; continues as MO 5 Terminus photos Counties: Polk, Warren, Marion, Monroe, Appanoose Cities along route: West Des Moines, Des Moines, Carlisle, Hartford, Pleasantville, Knoxville, Hamilton, Lovilia, Albia, Moravia, Centerville, Cincinnati Freeway segments: Expressway segments: Exit lists: NHS: From I-35 to the eastern split with US 65 in the Des Moines area Multiplexes: |
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| History | |
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Designated: January 1, 1969, replacing IA 60 (I)
southeast of Des Moines Paving history: The entire road was paved at the time of designation. Upgrades: |
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| Notes | |
| The Great Renumbering of 1969 created an Highway 5 that runs through Iowa, Missouri, and Arkansas. |
| Iowa 6 (I) |
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Designated: July 1, 1920 Decommissioned: October 16, 1926 Original western terminus: Nebraska state line (Missouri River) at Council Bluffs Original eastern terminus: Illinois state line (Mississippi River) at Clinton Paving history: At the time of designation, the only paved segment was the "Seedling Mile," a 1-mile segment northwest of Mount Vernon that was paved in 1919 as the first paved mile of the Lincoln Highway. Replaced by: US 30. This number was assigned to the Lincoln Highway. For a map of its estimated street alignment in Council Bluffs in 1924, see Jeff Morrison's Council Bluffs/Omaha Highway Chronology page. For a map of its street alignment in Cedar Rapids in 1926, see the Highways of Cedar Rapids page. |
| Iowa 6 (II) |
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Designated: October 16, 1926 Decommissioned: December 1, 1931 Original northern terminus: US 63 in Des Moines Original southern terminus: Missouri state line south of Cincinnati Paving history: At the time of designation, the only paved segment was from Des Moines to the Polk/Warren county line near Carlisle. Replaced by: IA 60 (I) upon the designation of US 6. It was originally part of IA 17 (I). For its street alignment in Des Moines, see the Highways of Des Moines page. |
| Iowa 7 (I) |
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Designated: July 1, 1920 Decommissioned: July 22, 1939 Original western terminus: Nebraska state line (Missouri River) at Council Bluffs; it was truncated at US 34 in Council Bluffs on October 16, 1926 Original eastern terminus: Illinois state line (Mississippi River) at Davenport; it was truncated at Des Moines on October 16, 1926. Paving history: At the time of designation, the only paved segment was from the junction at IA 89 at Johnston Station (now Johnston) to Des Moines. Major alignment changes: For alignment changes in Council Bluffs, see Jeff Morrison's Council Bluffs/Omaha Highway Chronology page. For alignment changes in Des Moines, see the Highways of Des Moines page. For a map of its street alignment in Davenport in 1924, see the Highways of Davenport and Bettendorf page. For a map of its estimated street alignment through Iowa City in 1925, see the Highways of Iowa City page. Replaced by: IA 7 was originally assigned to the River-to-River Road, which ran from Council Bluffs to Davenport via Harlan, Des Moines, Newton, Grinnell, and Iowa City. |
| Iowa 7 (II) |
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Designated: 1955 Decommissioned: 1957 Original northern terminus: Oakville Original southern terminus: IA 99 in southeastern Louisa County Paving history: The entire road was paved at the time of designation. Replaced by: IA 407. |
| Iowa 7 (III) |
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Designated: November 1957 Decommissioned: January 1, 1969 Original northern terminus: IA 3/5 between Akron and Le Mars Original southern terminus: US 77, and later I-29, in Sioux City Paving history: The segment outside of Sioux City had a bituminous surface and was not paved until 1971, after it was decommissioned.. Replaced by: County Road K22 and city streets in Sioux City; at decommissioning it followed Perry Creek Road (now part of Hamilton Boulevard), Dearborn Boulevard, Hamilton Boulevard, West 7th Street, and Wesley Way. It replaced IA 29 because of the numbering conflict with I-29. .For a map of its street alignment through Sioux City, see Jeff Morrison's Sioux City Highway Chronology page. |
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Iowa 7 |
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Length: 74 miles/119 kilometers Western terminus: IA 3 near Aurelia Eastern terminus: US 169 on the outskirts of Fort Dodge Terminus photos Counties: Cherokee, Buena Vista, Pocahontas, Calhoun, Webster Cities along route: Aurelia, Alta, Storm Lake, Newell, Fonda, Pomeroy, Manson, Fort Dodge Multiplexes: |
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| History | |
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Designated: January 1, 1969, along part of former IA 5 (I) Paving history: The entire road was paved at the time of designation. Major alignment changes: |
| Iowa 8 (I) |
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Designated: July 1, 1920 Decommissioned: October 16, 1926 Original western terminus: Nebraska state line (Missouri River) at Council Bluffs Original eastern terminus: Illinois state line (Mississippi River) at Burlington Paving history: There were no paved segments at designation. The only paved segments at decommissioning were a short segment to the southeast of Council Bluffs and a segment from Middletown through Burlington, both of which were paved in 1921. Major alignment changes: Replaced by: US 34. This number was assigned to the Blue Grass Route through southern Iowa via Red Oak, Creston, Ottumwa, Fairfield, and Mount Pleasant. For a map of its estimated street alignment in Council Bluffs in 1924, see Jeff Morrison's Council Bluffs/Omaha Highway Chronology page. |
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Iowa 8 |
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Length: 14 miles/23 kilometers Western terminus: US 63 in Traer Eastern terminus: US 218 in northwest Benton County Terminus photos Counties: Tama, Benton Cities along route: Traer, Dysart Multiplexes: |
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| History | |
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Designated: October 16, 1926, from part of IA 58. Paving history: The road was unpaved at designation and had a bituminous surface from 1941 until the segment in Tama County was paved in 1966. The segment in Benton County was paved in 1970. |
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Iowa 9 |
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Length: 296 miles/476 kilometers Western terminus: South Dakota state line near Sioux Falls, SD; continuation of SD 42 Eastern terminus: Wisconsin state line (Mississippi River) at Lansing; continues as WI 82 Western terminus photos Eastern terminus photos (with IA 26) Counties: Lyon, Osceola, Dickinson, Emmet, Kossuth, Winnebago, Worth, Mitchell, Howard, Winneshiek, Allamakee Cities along route: Larchwood, Lester, Rock Rapids, Ocheyedan, Lake Park, Spirit Lake, Superior, Estherville, Armstrong, Swea City, Buffalo Center, Thompson, Leland, Forest City, Fertile, Hanlontown, Manly, Osage, Riceville, Cresco, Ridgeway, Decorah, Waukon, Lansing Multiplexes: |
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| History | |
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Designated: July 1, 1920, from the South Dakota state line to Lansing. Most of this route
followed the old Imperial Highway (which had also incorporated the
former IA 105 between Lake Mills and St. Ansgar). Paving history: There were no paved segments at designation. Major alignment changes: |