# Special routes of U.S. Route 18

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

## Hot Springs bypass route

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.

## Mason City business loop

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.
The entire route is in Cerro Gordo County.
| Location | mi | km | Destinations | Notes |
| Clear Lake | 0.000 | 0.000 | I-35 / US 18 / Iowa 27 – Des Moines, Minneapolis Iowa 122 begins | Western end of Iowa 122 overlap |
| Mason City | 7.862 | 12.653 | US 65 north (S. Federal Avenue) / Iowa 122 east (6th Street SE) | Eastern end of Iowa 122 overlap; western end of US 65 overlap |
| Mason City | 10.752 | 17.304 | 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 Concurrency terminus |||||

## McGregor–Marquette business loop

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.
The entire route is in Clayton County.
| Location | mi | km | Destinations | Notes |
| Mendon Township | 0.000 | 0.000 | US 18 – Monona, Marquette Iowa 76 begins | Southern end of Iowa 76 overlap |
| Marquette | 4.149 | 6.677 | 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 Concurrency terminus |||||

## Mount Horeb business loop

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.
| Location | mi | km | Destinations | Notes |
| ​ | 0.0 | 0.0 | US 18 / US 151 / WIS 78 south Bus. US 151 begins | Begin US-Bus 151 and WIS 78 overlap |
| ​ | 0.1 | 0.16 | CTH-ID west | Begin CTH ID overlap |
| Mount Horeb | 1.7 | 2.7 | WIS 78 north | End WIS 78 overlap |
| Mount Horeb | 3.4 | 5.5 | 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 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 | km | Destinations | Notes |
| 0.0 | 0.0 | US 18 / US 151 Bus. US 151 begins | Begin US-Bus 151 overlap |
| 1.3 | 2.1 | CTH-M (Main Street) | |
| 2.4 | 3.9 | 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 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.
The entire route is in Dane County.
| Location | mi | km | Exit | Destinations | Notes |
| Verona | 0.0 | 0.0 | | US 18 / US 151 – Madison, Mount Horeb Alt. US 151 begins | West end of Alt. US 151 overlap |
| Verona | 0.2 | 0.32 | | CTH-M west | West end of CTH-M overlap |
| Fitchburg | 7.3 | 11.7 | | CTH-M ends / CTH-MM south | East end of CTH-M overlap; west end of CTH-MM overlap |
| Fitchburg | 7.6 | 12.2 | | US 14 east / CTH-MM north – Evansville | East end of CTH-MM overlap; west end of US 14 overlap |
| Fitchburg | 11.3 | 18.2 | 134 | To CTH-MM / Lacy Road | To CTH-MM only signed eastbound |
| Fitchburg | 12.6 | 20.3 | 133 | To CTH-MM / Mc Coy Road | Westbound exit eastbound entrance |
| Madison | 13.4 | 21.6 | 132 | 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 Concurrency terminus Incomplete access ||||||

## Milwaukee alternate route

Alternate U.S. Highway 18 (Alt. US 18) is a former segment of US 18 within Milwaukee, Wisconsin.