U.S. Route 18 in South Dakota

U.S. Highway 18
U.S. Highway 18
Route information
	Maintained by SDDOT
Length	449 mi (723 km)
Existed	1926–present
Major junctions
West end	US 18 at the Wyoming state line near Edgemont
	US 385 from Hot Springs to Oelrichs; US 83 in Mission; US 183 from Jordan Junction to Colome; US 281 from near Fairfax to near Armour; US 81 near Freeman; I-29 near Worthing;
East end	US 18 at the Iowa state line near Canton
Location
Country	United States
State	South Dakota
Counties	Fall River, Oglala Lakota, Bennett, Todd, Tripp, Gregory, Charles Mix, Douglas, Hutchinson, Turner, Lincoln
Highway system
	United States Numbered Highway System; List; Special; Divided; South Dakota State Trunk Highway System; Interstate; US; State;

U.S. Route 18 (US 18) is a part of the United States Numbered Highway System that travels from Orin, Wyoming, to Milwaukee, Wisconsin. In the state of South Dakota, US 18 runs from the Wyoming border east to the Iowa border.

Route description

US 18 enters South Dakota 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 over Fort Randall Dam. East of the Missouri River, US 18 passes through (or near) Lake Andes and Tripp before a brief concurrency with I-29 near Worthing. East of I-29, US 18 passes through Canton before crossing the Big Sioux River into Iowa.^[1]

The South Dakota section of US 18 is legally defined at South Dakota Codified Laws § 31-4-141.^[2]

County	Location	mi	km	Destinations	Notes
Fall River		0.000	0.000	US 18 west – Lusk	Continuation into Wyoming
Oglala Lakota
Bennett
Todd
Tripp
Gregory
Charles Mix
Douglas
Hutchinson
Turner
Lincoln	Canton Township	449	723	US 18 east – Inwood	Continuation into Iowa
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus

Template:Attached KML/U.S. Route 18 in South Dakota

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