U.S. Route 18 in Iowa

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This article is about the section of U.S. Route 18 in Iowa. For the entire route, see U.S. Route 18.

U.S. Highway 18 marker

U.S. Highway 18

Map
US 18 highlighted in red
Route information
Maintained by Iowa DOT
Length311.750 mi[1] (501.713 km)
ExistedNovember 11, 1926[2]–present
HistoryPrimary Road 19 from 1920–1926[3]
National Parks Pike registered in 1920[4]
Major junctions
West end US 18 near Canton, S.D.
Major intersections
East end US 18 / WIS 60 at McGregor
Location
CountryUnited States
StateIowa
Counties
Highway system
← Iowa 17→ US 20

U.S. Highway 18 (US 18) is the northernmost east–west

United States Numbered Highway in the state of Iowa. As with all state highways in Iowa, it is maintained by the Iowa Department of Transportation (Iowa DOT). It enters the state by crossing the Big Sioux River between Inwood and Canton, South Dakota. It travels about 312 miles (502 km) and connects Spencer, Mason City, and Charles City. The highway leaves the state via the Marquette–Joliet Bridge over the Mississippi River at Marquette
. Prior to becoming a U.S. Highway, the route US 18 follows was known as Primary Road No. 19 and the National Parks Pike.

Route description

US 18 begins at the Big Sioux River approximately two miles (3.2 km) east of Canton, South Dakota. It runs easterly through rural Lyon County, in the northwestern corner of the state. At Inwood, it meets Iowa Highway 182 (Iowa 182), which provides access to Sioux Falls, South Dakota, via Iowa 9 and South Dakota Highway 42. US 18 turns south at Inwood and heads into Sioux County. The highway crosses the Rock River on its way toward Rock Valley and Hull. West of Hull, at Perkins, US 18 juts to the south along US 75 before turning east again closer to Hull. The highway continues east toward Sheldon.[5]

As it crosses into

T intersection and each route heads in the opposite direction—US 18 to the east and US 71 to the west.[5]

East of Spencer, US 18 passes through

US 169. At the eastern county line, shared with Hancock County, is an intersection with Iowa 17, which marks that route's northern end.[5]

In Hancock County, the route passes through

US 65 and US 18 Bus. at exit 186.[5]

US 18/US 218/Iowa 27 pass a wind farm near Charles City

At the

US 218 Bus. The two routes meet the northern end of Iowa 14, and US 18 splits away to the east to cross the Cedar River
.

Heading east again, the route enters Chickasaw County and passes through Bassett on its way to New Hampton. It meets US 63 at a four-lane bypass on the western side of town. The two routes head south for eight miles (13 km), splitting at the mile 196 interchange which is also the eastern end of Iowa 346. The route turns to travel due east through Fredericksburg.[5]

US 18 crosses into Wisconsin via the Marquette–Joliet Bridge

Continuing due east, US 18 does not enter another community for 20 miles (32 km) until it reaches

business loop goes through the towns while the mainline skirts around them. The business loop rejoins the mainline at the foot of the Marquette–Joliet Bridge, which spans the Mississippi River.[5] US 18 continues east into Wisconsin with State Trunk Highway 60, which begins at the state line.[6]

History

Before it and the rest of the

Iowa State Highway Commission published its first state highway map in 1919.[7] The route was also called the National Parks Pike, which began at Yellowstone National Park and ended in Madison, Wisconsin, encompassing all of Primary Road No. 19 in the state. The pike was registered with the on April 29, 1920.[4] The National Parks Pike name fell into disuse after the highway became US 18.[8]

By 1927, a significant portion of the route was paved, while the remainder was graveled. All of O'Brien County and 80 miles (130 km) between Algona and Charles City were paved.[9] In seven years, the gap between O'Brien County and Algona was finished which created 160 miles (260 km) of continuous pavement. During those same seven years, the route from West Union to the Mississippi River and all of Primary Road No. 59, which included the seven-mile-long (11 km) overlap of US 18 near New Hampton were paved.[10] Primary Road No. 59 is now known as US 63. By the start of World War II, the only remaining section of US 18 that was not paved was an 11-mile (18 km) section west of Rock Valley in Sioux County.[11] That last section would not be completed for another 10 years.[12]

US 18 passing through McGregor in 1975

Prior to 1932, the only way vehicles traveling US 18 could cross the Mississippi River was by ferry. That changed in when identical suspension bridges were built to cross the river between

US 18 Bus.[14]

Over the late 1990s, construction began on the Avenue of the Saints corridor near Mason City. A new controlled-access facility was built south of the city east to Rudd.[5] On December 5, 1999, this section of freeway opened and US 18 was realigned onto the new road. The old alignment became Iowa 122. By the end of the next year, the four-lane expressway was extended to Charles City.[15] By 2003, an expressway carrying US 63 was built around New Hampton. US 18 was rerouted onto the expressway and the western end of Iowa 24 was moved to the US 63/US 18 interchange.[16]

Major intersections

CountyLocationmi[1]kmExit[5]DestinationsNotes
Big Sioux River0.0000.000
 US 18 west – Canton		Continuation into South Dakota
South Dakota–Iowa state line
LyonInwood4.9928.034

 Iowa 182 north to Iowa 9
SiouxLincoln Township24.85339.997
 US 75 north – Rock Rapids		Western end of US 75 overlap
25.84841.598
 US 75 south – Sioux Center		Eastern end of US 75 overlap
Iowa 60 Business
south (2nd Avenue)		Western end of Iowa 60 Business overlap
44.26971.244
Iowa 60 Business ends – Worthington, Minn., Sioux City
Eastern end of Iowa 60 Business overlap
Sanborn52.80684.983
 US 59 north – Worthington, Minn.		Western end of US 59 overlap
Franklin Township53.80286.586
 US 59 south – Primghar		Eastern end of US 59 overlap
US 71 north – Milford
Western end of US 71 overlap
81.755131.572
US 71 south – Storm Lake
Eastern end of US 71 overlap
Iowa 341
97.317156.617 CR N28 –
Iowa 314
Emmetsburg Township101.306163.036
 Iowa 4 north – Graettinger		Western end of Iowa 4 overlap
Emmetsburg106.075170.711
 Iowa 4 south (Broadway Street) – Pocahontas		Eastern end of Iowa 4 overlap
Palo Alto–Kossuth
county line		Fern Valley–Fairfield–
Lotts Creek–Whittemore
township quadripoint		119.698192.635
 Iowa 15 south – West Bend		Western end of Iowa 15 overlap
KossuthLotts Creek–Whittemore
township line		120.687194.227
 Iowa 15 north – Fenton		Eastern end of Iowa 15 overlap
US 169 – Algona, Bancroft
Kossuth–Hancock
county line		Wesley–Orthel
township line		143.858231.517
 Iowa 17 south – Corwith
Iowa 111
153.185246.527Diagonal StreetFormer
Iowa 424
US 69 north – Forest City
Western end of US 69 overlap
US 69 south – Belmond
Eastern end of US 69 overlap
Cerro GordoClear Lake172.233277.182N. 8th StreetFormer Iowa 107
175.352–
175.657		282.202–
282.693		194
US 18 Bus. east / Iowa 122 east – Mason City
Western end of I-35 / Iowa 27 overlap
176.204283.573193 CR B35 (4th Avenue South)Former
Iowa 106
Lake Township178.210–
179.045		286.801–
288.145		190
 I-35 south – Des Moines		Eastern end of I-35 overlap
183.163294.772183 Eisenhower Avenue — Airport
US 18 Bus. west – Downtown Mason City, Rockwell
Portland Township190.460306.516190 CR S56 (California Avenue)
Cerro Gordo–Floyd
county line		Portland–Rock Grove
township line		195.596314.781195 CR S70 – Nora Springs
FloydRudd Township203.141326.924 CR B30 – RuddFormer US 18
Floyd210.282338.416
 US 218 north – Floyd, Osage		Northern end of US 218 overlap
US 218 Bus. / CR B35 – Charles City
Saint Charles Township214.811345.705214 Iowa 14 – Charles City, Greene
US 218 Bus.
begins		Eastern end of US 218 and Iowa 27 overlaps; southern end of US 218 Business overlap
219.311352.947Old Highway RoadFormer US 218
220.238354.439
US 218 Bus. north / Iowa 14
south		Northern end of US 218 Business overlap
Iowa 393
New Hampton237.701–
238.049		382.543–
383.103		204

 US 63 north / Iowa 24 east – New Hampton, Lime Springs		Western end of US 63 overlap
New Hampton Township240.338386.787201225th Street – New Hampton
Dresden Township244.457–
244.955		393.415–
394.217		196

 US 63 south / Iowa 346 west – Nashua, Waterloo		Eastern end of US 63 overlap
Iowa 193
West Union270.469435.278
 Iowa 150 to Iowa 56 / River Bluffs Scenic Byway – Fayette, Calmar		Western end of River Bluffs Scenic Byway overlap
CR W42 / River Bluffs Scenic BywayEastern end of River Bluffs Scenic Byway overlap
Clermont CR B40 / River Bluffs Scenic BywayWestern end of River Bluffs Scenic Byway overlap
CR B60 / River Bluffs Scenic BywayEastern end of River Bluffs Scenic Byway overlap
Clayton
 No major junctions
AllamakeePost Township287.042461.949
 US 52 north – Calmar		Western end of US 52 overlap
Postville288.106463.662
 Iowa 51 north (N. Lawler Street)
CR B38 (S. Maple Street) / Driftless Area Scenic Byway
ClaytonGiard Township303.396488.269
 US 52 south / River Bluffs Scenic Byway – Guttenberg		Eastern end of US 52 overlap; western end of River Bluffs Scenic Byway overlap
US 18 Bus. east / Iowa 76 north – McGregor
US 18 Bus. west / Iowa 76 / Great River Road / River Bluffs Scenic Byway – Marquette, McGregor
Mississippi River311.750501.713Marquette–Joliet Bridge; Iowa–Wisconsin state line


 US 18 east / WIS 60 east – Prairie du Chien		Continuation into Wisconsin
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References

  1. ^
    ESRI shapefile
    )    . Ames: Iowa Department of Transportation. April 9, 2021. Retrieved April 17, 2021.
  2. OCLC 32889555. Retrieved November 7, 2013 – via Wikimedia Commons
    .
  3. ^ Official Auto Trails Map (Map). 1:1,081,344. Rand McNally. 1921. p. 330-331.
  4. ^ a b "Iowa Registered Routes". Iowa Department of Transportation. Retrieved September 15, 2011.
  5. ^ a b c d e f g h Transportation Map (PDF) (Map). Iowa Department of Transportation. 2011. Retrieved September 12, 2011.
  6. ^ Morrison, Jeff (December 9, 2007). "Iowa termini of US 18". Iowahigwhayends.net. Retrieved September 14, 2011.
  7. Iowa State Highway Commission
    . 1919. Retrieved September 15, 2011.
  8. ^ Iowa Registered Highway Routes 1914–1925 (PDF) (Map). Iowa Department of Transportation. 1986. Retrieved September 15, 2011.
  9. ^ Iowa State Highway Map (PDF) (Map). Iowa State Highway Commission. 1927. Retrieved September 15, 2011.
  10. ^ Iowa State Highway Map (PDF) (Map). Iowa State Highway Commission. June 1934. Retrieved September 15, 2011.
  11. ^ Iowa State Highway Map (PDF) (Map). Iowa State Highway Commission. 1939. Retrieved September 15, 2011.
  12. ^ Iowa State Highway Map (PDF) (Map). Iowa State Highway Commission. 1950. Retrieved September 15, 2011.
  13. ^ Rodenburg, Lucy. "The old Suspension Bridge provided the river crossing from 1932-1974". North Iowa Times. McGregor, Iowa. Archived from the original on August 16, 2011. Retrieved September 15, 2011.
  14. ^ Iowa State Highway Map (PDF) (Map). Iowa Department of Transportation. 1990. Retrieved September 15, 2011.
  15. ^ "Avenue of the Saints". Iowa Department of Transportation. Archived from the original on February 6, 2016. Retrieved September 16, 2011.
  16. ^ Iowa State Highway Map (PDF) (Map). Iowa Department of Transportation. 2003. Retrieved September 16, 2011.

External links

KML file (edit • help)
Template:Attached KML/U.S. Route 18 in Iowa
KML is from Wikidata


U.S. Route 18
Previous state:
South Dakota 		Iowa Next state:
Wisconsin
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