South Dakota Highway 20

Highway 20
Route of SD 20 (in red)
Route information
Defined by SDCL §31-4-145
Maintained by SDDOT
Length:	428.852 mi[1][2][3] (690.170 km)
Existed:	1929 – present
Western section
Length:	389.828 mi[1][2][3] (627.367 km)
West end:	Montana state line near Camp Crook
Major junctions:	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
Length:	39.024 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
Counties:	Harding, Perkins, Ziebach, Dewey, Corson, Walworth, Potter, Faulk, Spink, Clark, Codington, Grant
Highway system
South Dakota Highways ← 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

County	Location	mi[1][2][3]	km	Destinations	Notes
Carter	​	0.000	0.000	Tie Creek Road	Continuation into Montana
Harding	Buffalo	26.130	42.052	US 85 north – Bowman	Northern end of US 85 concurrency
	​	27.655	44.506	US 85 south – Belle Fourche	Southern end of US 85 concurrency
	​	50.030	80.515	SD 79 south – Newell	Western end of SD 79 concurrency
	​	54.483	87.682	SD 79 north – Reeder	Eastern end of SD 79 concurrency
Perkins	​	72.193	116.183	SD 75 north – Hettinger
	​	95.210	153.226	SD 73 north – Lemmon	Northern end of SD 73 concurrency
	​	101.187	162.845	SD 73 south – Faith	Southern end of SD 73 concurrency
Ziebach	​	127.223	204.746	SD 65 south – Dupree	Western end of SD 65 concurrency
Dewey	Isabel	130.881	210.633	SD 65 north – McIntosh	Eastern end of SD 65 concurrency
	​	142.647	229.568	SD 63 south – Eagle Butte	Western end of SD 63 concurrency
	​	164.952	265.465	SD 63 north – McLaughlin	Eastern end of SD 63 concurrency
Corson	​	182.033	292.954	US 12 west – McLaughlin	Western end of US 12 concurrency
	​	185.095	297.882	SD 1806 south	Western end of SD 1806 concurrency
	​	186.267	299.768	SD 1806 north – Fort Yates, ND	Eastern end of SD 1806 concurrency
Walworth	Mobridge	190.508	306.593	SD 1804 north – Pollock	Western end of SD 1804 concurrency
	​	194.386	312.834	SD 1804 south – Akaska	Eastern end of SD 1804 concurrency
	​	208.759	335.965	US 83 north – Mound City	Northern end of US 83 concurrency
	Selby	211.623	340.574	SD 130 east – Java
	​	215.876	347.419	US 12 east – Bowdle, Aberdeen	Eastern end of US 12 concurrency
	​	224.663	361.560	SD 144 west – Akaska
	​	230.710	371.292	US 83 south – Agar, Pierre	Southern end of US 83 concurrency
	​	243.723	392.234	SD 47 north	Northern end of SD 47 concurrency
Potter	​	247.403	398.157	SD 47 south – Lebanon	Southern end of SD 47 concurrency
Faulk	​	284.415	457.722	SD 45 north – Ipswich	Northern end of SD 45 concurrency
	​	286.422	460.952	SD 45 south – Miller	Southern end of SD 45 concurrency
Spink	​	314.227	505.699	US 281 – Aberdeen, Redfield
	Conde	334.227	537.886	SD 37 north – Verdon, Groton	Northern end of SD 37 concurrency
	​	334.236	537.901	SD 37 south – Turton, Doland	Southern end of SD 37 concurrency
Clark	​	362.337	583.125	SD 25 – Webster, DeSmet
Codington	Watertown	389.828	627.367	US 212 – Henry, Kranzburg
Gap in route
Codington	​	389.828	627.367	157th Street	Begin state maintenance
	​	392.017– 392.217	630.890– 631.212	I-29 / US 81 – Fargo, Brookings	I-29 exit 193.
Grant	​	412.690	664.160	SD 15 north / SD 158 east – Milbank	Northern end of SD 15 concurrency
	​	419.712	675.461	SD 15 south – Clear Lake	Southern end of SD 15 concurrency
Lac qui Parle	​	428.852	690.170	MN 40 east – Marietta	Continuation into Minnesota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

See also

• South Dakota portal
• U.S. Roads portal
• List of South Dakota numbered highways

References

External links

Route map: Bing / Google

• South Dakota Highways Page: Highways 1-30