U.S. Route 18 in South Dakota

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

U.S. Highway 18

US 18 highlighted in red
Route information
Defined by SDCL §31-4-141
Maintained by SDDOT
Length451.88 mi[1] (727.23 km)
Existed1926–present
Major junctions
West end US 18 at the Wyoming state line near Edgemont
Major intersections
East end US 18 at the Iowa state line near Canton
Location
CountryUnited States
StateSouth Dakota
CountiesFall River, Oglala Lakota, Bennett, Todd, Tripp, Gregory, Charles Mix, Douglas, Hutchinson, Turner, Lincoln
Highway system
  • South Dakota State Trunk Highway System
← SD 17→ SD 18

U.S. Highway 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 Interstate 29 (I-29) near Worthing. East of I-29, US 18 passes through Canton before crossing the Big Sioux River into Iowa.[2]

The South Dakota section of US 18 is legally defined at South Dakota Codified Laws § 31-4-141.[3]

History

Major intersections

CountyLocationmi[1]kmDestinationsNotes
Fall River​0.000.00
 US 18 west – Lusk		Continuation into Wyoming
Edgemont12.1019.47
 SD 471 south – Edgemont, Provo		Northern terminus of SD 471
​24.1838.91
 SD 89 north – Custer		Southern terminus of SD 89
Hot Springs39.8264.08
 SD 71 south – Ardmore		Northern terminus of SD 71
40.5465.24
 US 385 north – Mount Rushmore, Wind Cave National Park		Western end of US 385 concurrency
Maverick Junction44.6771.89
 SD 79 north – Rapid City		Western end of SD 79 concurrency
Oelrichs62.27100.21

 US 385 south / SD 79 south – Chadron		Eastern end of US 385/SD 79 concurrency
Oglala LakotaPine Ridge103.53166.62
 SD 407 south – Rushville		Northern terminus of SD 407
​120.99194.71
 SD 391 south – Gordon		Northern terminus of SD 391
BennettMartin148.94239.70
 SD 73 south – Merriman		Western end of SD 73 concurrency
​161.42259.78
 SD 73 north – Kadoka		Eastern end of SD 73 concurrency
Todd​189.98305.74
 SD 63 north – Parmelee, Norris		Southern end of SD 63
​206.35332.09
 US 83 north – White River		Western end of US 83 concurrency
Mission209.69337.46
 US 83 south – Valentine		Eastern end of US 83 concurrency
TrippJordan Township242.54390.33
 SD 53 south – Clearfield		Western end of SD 53 concurrency
Jordan Junction243.54391.94


 US 183 north / SD 44 west / SD 53 north – Presho		Western end of US 183/SD 44 concurrency; eastern end of SD 53 concurrency
Winner252.70406.68
 SD 44 east – Platte		Eastern end of SD 44 concurrency
Colome263.34423.80

 US 183 south / SD 49 north – Bassett		Eastern end of US 183 concurrency; Southern terminus of SD 49
GregoryGregory277.92447.27


 SD 47 north / SD 251 south to I-90		Western end of SD 47 concurrency; Northern terminus of SD 251
Burke286.03460.32
 SD 47 south – Jamison		Eastern end of SD 47 concurrency
Pleasant Valley Township305.22491.20
 SD 1806 north – Whetstone Bay		Southern terminus of SD 1806
Fairfax Township311.99502.10
 SD 43 south – Butte		Northern terminus of SD 43
Star Valley Township320.78516.25
 US 281 south – Spencer, O'Neill		Western end of US 281 concurrency
Missouri RiverFort Randall Dam
Charles MixPickstown332.90535.75
 SD 46 east (297th Street) – Wagner		Western terminus of SD 46
Lake Andes338.98545.54
 SD 50 west – Geddes, Platte		Western end of SD 50 concurrency
Plain Center–Bryan
township line		348.90561.50
 SD 50 east – Wagner		Eastern end of SD 50 concurrency
Howard–Kennedy
township line		355.87572.72
 US 281 north – Armour		Eastern end of US 281 concurrency
DouglasNo major intersections
HutchinsonFair Township373.94601.80 SD 37 – Tripp, Parkston
Capital Township387.70623.94
 SD 25 south – Scotland
Molan Township402.77648.20 US 81 – Freeman, Yankton
TurnerSwan Lake Township419.82675.63
 SD 19 south – Viborg		Western end of SD 19 concurrency
Swan Lake–Hurley
township line		420.81677.23
 SD 19 north – Hurley		Eastern end of SD 19 concurrency
LincolnLincoln–Lynn
township line		435.23700.43
 I-29 south – Beresford		Western end of I-29 concurrency; I-29 exit 62
Lynn Township438.25705.30
 I-29 north – Sioux Falls		Eastern end of I-29 concurrency; I-29 exit 59
441.72710.88

 SD 115 north / CR 121 south (474th Avenue) – Sioux Falls		Southern terminus of SD 115
Canton Township445.71717.30
 SD 11 north (478th Avenue) – Sioux Falls		Western end of SD 11 concurrency
446.67718.85
 SD 11 south (479th Avenue) – Alcester		Eastern end of SD 11 concurrency
Big Sioux River451.88727.23South Dakota–Iowa state line

 US 18 east – Inwood		Continuation into Iowa
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

References

  1. ^ a b "State Highway Data Viewer". South Dakota Department of Transportation. Archived from the original on November 4, 2023. Retrieved January 7, 2024.
  2. ^ The State of South Dakota (PDF) (Map). South Dakota Department of Transportation. 2023. Archived (PDF) from the original on November 1, 2023. Retrieved January 20, 2024.
  3. ^ "31-4-141. U.S. Highway 18 from Wyoming to Iowa". South Dakota Statutes. Archived from the original on October 31, 2023. Retrieved August 15, 2012.

External links


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