Special routes of U.S. Route 18

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Special routes of U.S. Route 18
Highway system

At least eight special routes of U.S. Route 18 (US 18) have existed.

Hot Springs bypass route

By-pass plate.svg

U.S. Highway 18 Bypass

LocationHot Springs, South Dakota
Length1.83 mi[1] (2.95 km)

U.S. Highway 18 Bypass (US 18 Byp.) is a bypass around the Hot Springs, South Dakota, city center. It begins on the west side of Hot Springs at an intersection with US 18 and travels in a southeasterly direction. The highway skirts the western and southern edges of the city and meets South Dakota Highway 71 close to the point where the route turns east. It ends at US 18/US 385 in the southeastern corner of the city.[2]

Hot Springs truck route

Truck plate.svg

U.S. Highway 18 Truck

LocationHot Springs, South Dakota

Mason City business loop

Business plate.svg

U.S. Highway 18 Business

LocationMason City, Iowa
Length10.752 mi[3] (17.304 km)

U.S. Highway 18 Business (US 18 Bus.) begins at a diamond interchange with Interstate 35 (I-35) on the eastern edge of Clear Lake, Iowa. The route, overlapped by Iowa Highway 122 (Iowa 122), begins as a four-lane divided highway, serving the Mason City Municipal Airport before entering Mason City proper. Between Eisenhower and Jefferson avenues in Mason City, the highway is undivided. This road is the primary east–west artery through Mason City. At Jefferson Avenue, US 18 Bus./Iowa 122 separate into a pair of one-way streets, remaining in this configuration through the downtown area where the Park Inn Hotel, one of Frank Lloyd Wright's few commercial buildings, resides. They intersect US 65 at Federal Street. US 18 Bus. turns to the south to follow US 65. The business loop rejoins its parent route south of the city limits.[4]

The entire route is in Cerro Gordo County.

Locationmi[3]kmDestinationsNotes
Clear Lake0.0000.000
I-35 / US 18 / Iowa 27 – Des Moines, Minneapolis

Iowa 122 begins
Western end of Iowa 122 overlap
Mason City7.86212.653

US 65 north (S. Federal Avenue) / Iowa 122 east (6th Street SE)
Eastern end of Iowa 122 overlap; western end of US 65 overlap
10.75217.304

US 18 / Iowa 27 / US 65 south – Rockwell, Clear Lake, Hampton, Charles City
Eastern end of US 65 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

McGregor–Marquette business loop

Business plate.svg

U.S. Highway 18 Business

LocationMcGregorMarquette, Iowa
Length4.149 mi[3] (6.677 km)
Existed1989–present

U.S. Highway 18 Business (US 18 Bus.) begins at an intersection with US 18 west of McGregor, Iowa. The route descends into the Mississippi River valley along the northern border of Pikes Peak State Park and then turns into McGregor. Through McGregor, US 18 Bus. heads to the northeast toward the Mississippi River. Along the river, the highway is parallel to the Dakota, Minnesota and Eastern Railroad. For one mile (1.6 km), US 18 Bus. travels a narrow strip of land between the river and the bluffs where it passes a riverboat casino. At Marquette, US 18 Bus. ends at the foot of the Marquette–Joliet Bridge, which carries US 18 to Prairie du Chien, Wisconsin.[5]

The entire route is in Clayton County.

Locationmi[3]kmDestinationsNotes
Mendon Township0.0000.000 US 18 – Monona, Marquette

Iowa 76 begins
Southern end of Iowa 76 overlap
Marquette4.1496.677
To US 18 (Marquette–Joliet Bridge) – Prairie Du Chien

Iowa 76 north – Effigy Mounds
Interchange; northern end of Iowa 76 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Mount Horeb business loop

Business plate.svg

Business U.S. Highway 18

LocationMount Horeb, Wisconsin
Length3.4 mi[6] (5.5 km)

Business U.S. Highway 18 (Bus. US 18) is a former segment of US 18/US 151 between exits 65 and 69 within Mount Horeb, Wisconsin. The route is also shared by Bus. US 151, as well as parts of State Trunk Highway 78 (WIS 78) and County Trunk Road ID (CTH-ID).

The entire route is in Dane County.

Locationmi[7]kmDestinationsNotes
0.00.0
US 18 / US 151 / WIS 78 south


Bus. US 151 begins
Begin US-Bus 151 and WIS 78 overlap
0.10.16
CTH-ID west
Begin CTH ID overlap
Mount Horeb1.72.7
WIS 78 north
End WIS 78 overlap
3.45.5 US 18 / US 151



Bus. US 151 ends / CTH-ID ends
End US-Bus 151 and CTH ID overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Verona business loop

Business plate.svg

Business U.S. Highway 18

LocationVerona, Wisconsin
Length2.4 mi[8] (3.9 km)

Business U.S. Highway 18 (Bus. US 18) is a former segment of US 18/US 151 within Verona, Wisconsin. The route is also shared by Bus. US 151 and CTH-MV. Bus. US 18/Bus. US 151/CTH-MV begins at a pair of flyover interchanges with US 18/US 151 on exit 76 west of Verona. Eastbound exit 76 runs directly into the business routes on West Verona Avenue, while westbound exit 76 connects to the business routes by way of Epic Lane. From there, the business routes run east-northeast as a four-lane divided highway until the intersection with Legion Street, where it becomes a local two-lane undivided road. At the intersection with North and South Main streets (CTH-M), West Verona Avenue becomes East Verona Avenue, making a brief reverse curve to the left before returning to its previous trajectory at School Street and becoming a four-lane divided highway east of there. Bus. US 18/Bus. US 151/CTH-MV ends east of Verona at exit 81 on US 18/US 151, but only with an eastbound onramp and westbound offramp.

The entire route is in Verona, Dane County.

mi[8]kmDestinationsNotes
0.00.0 US 18 / US 151


Bus. US 151 begins
Begin US-Bus 151 overlap
1.32.1 CTH-M (Main Street)
2.43.9 US 18 / US 151


Bus. US 151 ends
End US-Bus 151 overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Dane County alternate route

Alternate plate.svg

Alternate U.S. Highway 151

LocationDane County, Wisconsin

Alternate U.S. Highway 18 (Alt. US 18) is a permanently signed detour route that begins in Verona, Wisconsin. The route follows CTH-PB, CTH-M, and CTH-MM to connect with US 14 north of Oregon, then uses US 14 to reconnect with the main route in Madison. The route is concurrent with Alt. US 151.[9]

The entire route is in Dane County.

Locationmi[10]kmExitDestinationsNotes
Verona0.00.0 US 18 / US 151 – Madison, Mount Horeb


Alt. US 151 begins
West end of Alt. US 151 overlap
0.20.32
CTH-M west
West end of CTH-M overlap
Fitchburg7.311.7

CTH-M ends / CTH-MM south
East end of CTH-M overlap; west end of CTH-MM overlap
7.612.2

US 14 east / CTH-MM north – Evansville
East end of CTH-MM overlap; west end of US 14 overlap
11.318.2134
To CTH-MM / Lacy Road
To CTH-MM only signed eastbound
12.620.3133
To CTH-MM / Mc Coy Road
Westbound exit eastbound entrance
Madison13.421.6132
US 12 / US 18 / US 151 / US 14 west


Alt. US 151 ends
East end of US 14 and Alt. US 151 overlap; access to SSM Health Saint Mary's Hospital - Madison
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Milwaukee alternate route

Alternate plate.svg

Alternate U.S. Highway 18

LocationMilwaukee, Wisconsin

Alternate U.S. Highway 18 (Alt. US 18) is a former segment of US 18 within Milwaukee, Wisconsin. The route was marked on Rand McNally maps in 1967 and 1971, but not official Wisconsin Department of Transportation maps; it is unclear whether it was an official alternate route or a temporary construction detour.[6]

References

  1. ^ "State Highway Log" (PDF). Rapid City: South Dakota Department of Transportation. February 11, 2013. p. 488. Retrieved December 2, 2013.
  2. ^ Google (December 3, 2013). "US 18 Truck in Hot Springs, SD" (Map). Google Maps. Google. Retrieved December 3, 2013.
  3. ^ a b c d 2012 Volume of Traffic on the Primary Road System of Iowa (PDF) (Report). Iowa Department of Transportation. January 1, 2012. Retrieved December 2, 2013.
  4. ^ Google (December 14, 2020). "Special routes of U.S. Route 18" (Map). Google Maps. Google. Retrieved December 14, 2020.
  5. ^ Google (December 14, 2020). "Special routes of U.S. Route 18" (Map). Google Maps. Google. Retrieved December 14, 2020.
  6. ^ a b "Wisconsin Highways: Master List 1917-Present". www.wisconsinhighways.org. Retrieved 2020-12-14.
  7. ^ Google (April 29, 2022). "US 18 Bus Mount Hebron" (Map). Google Maps. Google. Retrieved April 29, 2022.
  8. ^ a b Google (April 29, 2022). "US Bus 18 - Verona" (Map). Google Maps. Google. Retrieved April 29, 2022.
  9. ^ "US 18-151 Full Closure October 8-9 2016" (PDF). Wisconsin Department of Transportation. Retrieved August 30, 2020.
  10. ^ Google (April 1, 2023). "US Alt 18/151" (Map). Google Maps. Google. Retrieved April 1, 2023.