U.S. Highway 18 marker

U.S. Highway 18

US 18 highlighted in red
Route information
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. 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.[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 River0.000.00
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
Todd189.98305.74
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
Tripp242.54390.33
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
305.22491.20
SD 1806 north – Whetstone Bay
Southern terminus of SD 1806
311.99502.10
SD 43 south Butte
Northern terminus of SD 43
320.78516.25
US 281 south Spencer, O'Neill
Western end of US 281 concurrency
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
348.90561.50
SD 50 east Wagner
Eastern end of SD 50 concurrency
355.87572.72
US 281 north Armour
Eastern end of US 281 concurrency
Douglas
No major junctions
Hutchinson373.94601.80 SD 37 Tripp, Parkston
387.70623.94
SD 25 south Scotland
402.77648.20 US 81 Freeman, Yankton
Turner419.82675.63
SD 19 south Viborg
Western end of SD 19 concurrency
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
445.71717.30
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
Canton Township451.88727.23
US 18 east Inwood
Continuation into Iowa
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References

  1. 1 2 "State Highway Data Viewer". South Dakota Department of Transportation. Retrieved January 7, 2024.
  2. "South Dakota State Map" (PDF). South Dakota Department of Transportation.
  3. "31-4-141. U.S. Highway 18 from Wyoming to Iowa". South Dakota Statutes.
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