U.S. Route 18

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U.S. Route 18
Length:	1,043 mi[1] (1,679 km)
Formed:	1926[1]
West end:	I-25 at Orin, WY
Major junctions:	I-29 near Worthing, SD I-35 at Clear Lake, IA I-39/I-90 at Madison, WI
East end:	Milwaukee, WI
United States Numbered Highways U.S. Routes - Bannered - Divided - Replaced

U.S. Highway 18 (US 18), an east-west route, is one of the original United States highways of 1926.

[edit] Termini

As of 2006, the highway's eastern terminus is in downtown Milwaukee, Wisconsin. Its western terminus is in Orin, Wyoming at an interchange with Interstate 25.^[2] However, U.S. 18 is multiplexed with other U.S. routes from Mule Creek Junction, Wyoming to its stated terminus.

Historical note: US-18 was originally proposed also in Michigan from Detroit to Grand Haven. This stretch became US-16.

[edit] States traversed

The highway passes through the following states:

[edit] Wyoming

U.S. 18 runs concurrently with U.S. Route 20 from Interstate 25 to Lusk, where U.S. 18 branches off to run concurrently with U.S. Route 85. At the unincorporated community of Mule Creek Junction in northeastern Niobrara County, U.S. 18 leaves U.S. 85. This ten-mile stretch from U.S. 85 to the South Dakota border is the only segment of U.S. 18 in Wyoming which is not co-signed with another highway.

[edit] South Dakota

U.S. 18 enters the state west of Edgemont. It passes through Hot Springs, the Pine Ridge Indian Reservation, the Rosebud Indian Reservation, Winner, and Gregory before crossing the Missouri River near Pickstown. East of the Missouri River, U.S. 18 passes through (or near) Lake Andes and Tripp before a brief multiplex with Interstate 29 near Worthing. East of I-29, U.S. 18 passes through Canton before crossing the Big Sioux River into Iowa.

Legal Definition

The South Dakota section of U.S. 18, other than the multiplex with Interstate 29, is defined at South Dakota Codified Laws § 31-4-141.[1]

[edit] Iowa

U.S. 18 enters Iowa via a Big Sioux River crossing west of Inwood. It is multiplexed with U.S. Route 71 through Spencer. U.S. 18 passes through Emmetsburg, Algona and Garner before intersecting Interstate 35 in Clear Lake. After a brief multiplex with I-35, U.S. 18 continues as a freeway bypassing Mason City to the south. At Charles City, U.S. 18 becomes a rural two-lane highway again, except for a brief multiplex with the U.S. Route 63 bypass of New Hampton. Once past West Union, it joins U.S. Highway 52 at Postville, then leaving 52 about 7 miles east of Monona before crossing the Mississippi River into Wisconsin via the Marquette-Joliet Bridge in the city of Marquette.

U.S. 18 is the designated route of the Avenue of the Saints between Clear Lake and Charles City.

[edit] Wisconsin

Upon entry into the state at Prairie du Chien, US 18 is the terminus for WIS 60. The two routes are then concurrent until Bridgeport where WIS 60 splits off to the east and US 18 crosses the Wisconsin River and turns east on the other side. The route joins the US 151 expressway in Dodgeville and the two remain concurrent east to Madison (See U.S. Route 151 in Wisconsin for an interchange list). US 18 follows US 12 south of Madison and passes through or around Cambridge, Jefferson and Waukesha before terminating in Milwaukee at the junction of East Michigan St and Lincoln Memorial Drive in downtown.

[edit] Related routes

• U.S. Highway 118
• U.S. Highway 218 runs north and south. The parent and child meet in Charles City, Iowa.

[edit] References

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		edit Main U.S. Routes
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101		163						400				412				425
Lists		U.S. Routes - Bannered - Divided - Replaced

Browse numbered routes
< US 16	WY		US 20 >
< SD 17	SD		SD 19 >
< IA 17	IA		US 20 >
< WIS 17	WI		WIS 18 >