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South Dakota Highway 20

Route map:
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Highway 20 marker
Highway 20
Route of SD 20 (in red)
Route information
Maintained by SDDOT
Length428.852 mi[1][2][3] (690.170 km)
Existed1929–present
Western section
Length389.828 mi[1][2][3] (627.367 km)
West endMontana state line near Camp Crook
Major intersections US 85 in Buffalo
US 12 in Mobridge
US 83 in Selby
US 281 west of Mellette
East end US 212 in Watertown
Eastern section
Length39.024 mi[3] (62.803 km)
West end I-29 / US 81 west of South Shore
East end MN 40 at the Minnesota state line east of Revillo
Location
CountryUnited States
StateSouth Dakota
CountiesHarding, Perkins, Ziebach, Dewey, Corson, Walworth, Potter, Faulk, Spink, Clark, Codington, Grant
Highway system
  • South Dakota State Trunk Highway System
← SD 19A→ SD 20A

South Dakota Highway 20 (SD 20) is a state route that largely runs from border to border across the northern part of the U.S. state of South Dakota. It is one of the state's most rural highways.[4]

South Dakota Highway 20 consists of two segments. The longer segment begins at the Montana border west of Camp Crook, and terminates at the junction of U.S. Route 212 (US 212) in Watertown. This segment is just less than 390 miles (630 km) in length. A second segment begins just west of an interchange with Interstate 29 (I-29) and US 81. It continues eastward to the Minnesota border east of Revillo, then becomes Minnesota State Highway 40 (MN 40). This second segment is just over 39 miles (63 km) in length, and the total length of the route is about 429 miles (690 km).

History

South Dakota 20 was implemented in 1929, but it was much shorter. The western terminus was at South Dakota Highway 45 northeast of Faulkton, and terminated in Watertown. Around 1944, the western terminus was moved further west, to U.S. Highway 83.

In the early 1950s, a short extension west was made again, to the town of Akaska. The eastern terminus was moved as well, to U.S. Highway 77 south of Milbank; the extension to the Minnesota border occurred in 1954.

In the late 1960s, the short stub between Akaska and U.S. 83 was redesignated as South Dakota Highway 20 Spur. SD 20 was extended northward along U.S. 83 to U.S. Highway 12, then through Mobridge and across north central and northwest South Dakota, absorbing the alignment of what had been South Dakota Highway 8.

Major intersections

CountyLocationmi[1][2][3]kmDestinationsNotes
Carter​0.0000.000Tie Creek RoadContinuation into Montana
HardingBuffalo26.13042.052
 US 85 north – Bowman		Northern end of US 85 concurrency
​27.65544.506
 US 85 south – Belle Fourche		Southern end of US 85 concurrency
​50.03080.515
 SD 79 south – Newell		Western end of SD 79 concurrency
​54.48387.682
 SD 79 north – Reeder		Eastern end of SD 79 concurrency
Perkins​72.193116.183
 SD 75 north – Hettinger
​95.210153.226
 SD 73 north – Lemmon		Northern end of SD 73 concurrency
​101.187162.845
 SD 73 south – Faith		Southern end of SD 73 concurrency
Ziebach​127.223204.746
 SD 65 south – Dupree		Western end of SD 65 concurrency
DeweyIsabel130.881210.633
 SD 65 north – McIntosh		Eastern end of SD 65 concurrency
​142.647229.568
 SD 63 south – Eagle Butte		Western end of SD 63 concurrency
​164.952265.465
 SD 63 north – McLaughlin		Eastern end of SD 63 concurrency
Corson​182.033292.954
 US 12 west – McLaughlin		Western end of US 12 concurrency
​185.095297.882
 SD 1806 south		Western end of SD 1806 concurrency
​186.267299.768
 SD 1806 north – Fort Yates, ND		Eastern end of SD 1806 concurrency
WalworthMobridge190.508306.593
 SD 1804 north – Pollock		Western end of SD 1804 concurrency
​194.386312.834
 SD 1804 south – Akaska		Eastern end of SD 1804 concurrency
​208.759335.965
 US 83 north – Mound City		Northern end of US 83 concurrency
Selby211.623340.574
 SD 130 east – Java
​215.876347.419
 US 12 east – Bowdle, Aberdeen		Eastern end of US 12 concurrency
​224.663361.560
 SD 144 west – Akaska
​230.710371.292
 US 83 south – Agar, Pierre		Southern end of US 83 concurrency
​243.723392.234
 SD 47 north		Northern end of SD 47 concurrency
Potter​247.403398.157
 SD 47 south – Lebanon		Southern end of SD 47 concurrency
Faulk​284.415457.722
 SD 45 north – Ipswich		Northern end of SD 45 concurrency
​286.422460.952
 SD 45 south – Miller		Southern end of SD 45 concurrency
Spink​314.227505.699 US 281 – Aberdeen, Redfield
Conde334.227537.886
 SD 37 north – Verdon, Groton		Northern end of SD 37 concurrency
​334.236537.901
 SD 37 south – Turton, Doland		Southern end of SD 37 concurrency
Clark​362.337583.125 SD 25 – Webster, DeSmet
CodingtonWatertown389.828627.367 US 212 – Henry, Kranzburg
Gap in route
Codington​389.828627.367157th StreetBegin state maintenance
​392.017–
392.217		630.890–
631.212		 I-29 / US 81 – Fargo, BrookingsI-29 exit 193.
Grant​412.690664.160

 SD 15 north / SD 158 east – Milbank		Northern end of SD 15 concurrency
​419.712675.461
 SD 15 south – Clear Lake		Southern end of SD 15 concurrency
Lac qui Parle​428.852690.170
 MN 40 east – Marietta		Continuation into Minnesota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References

  1. ^ a b c "State Highway Log: Rapid City Region" (PDF). South Dakota Department of Transportation. January 2012. Retrieved December 26, 2013.
  2. ^ a b c "State Highway Log: Pierre Region" (PDF). South Dakota Department of Transportation. January 2012. Retrieved December 26, 2013.
  3. ^ a b c d "State Highway Log: Aberdeen Region" (PDF). South Dakota Department of Transportation. January 2012. Retrieved December 26, 2013.
  4. ^ Andrews, John (November 2010). "The Road Less Traveled". South Dakota Magazine.
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