The following is a list of former state highways in South Dakota. These roads are now either parts of other routes or no longer carry a route number. __TOC__

Highway 8

South Dakota Highway 8 was one of only two single digit state highway numbers known to be used in

South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...

. It was a state route across north central and northwest South Dakota, generally following what is now South Dakota Highway 20. The first designation of this route, in 1926, was

South Dakota Highway 18 The following is a list of former state highways in South Dakota. These roads are now either parts of other routes or no longer carry a route number. __TOC__ Highway 8 South Dakota Highway 8 was one of only two single digit state highway numb ...

. By the late 1920s,

U.S. Highway 18 U.S. Route 18 (US 18) is an east–west U.S. highway in the Midwestern United States. The western terminus is in Orin, Wyoming at an interchange with Interstate 25. Its eastern terminus is in downtown Milwaukee, Wisconsin. However, US 18 ru ...

was established across southern South Dakota. The existence of two highway 18's was corrected around 1935, when the northern highway was redesignated as South Dakota 8. This number remained in use until the late 1960s, when SD 20 was extended west across the Missouri River, absorbing the SD 8 alignment.

Highway 9

South Dakota Highway 9 was a designation that was used twice. This road went from Minnesota west to Sioux Falls. When the U.S. highway system was implemented in 1926, th road was designated as part of U.S. Highway 16. After a short period of dual signage, the SD 9 designation was dropped. South Dakota Highway 9 was a short state route in Marshall County. It was one of only two known single digit state highway numbers used in

. When highways were first numbered in the 1920s, this route was the northern end of

South Dakota Highway 25 South Dakota Highway 25 (SD 25) is a state highway in the eastern part of the U.S. state of South Dakota. It connects Scotland, Howard, De Smet, and Webster. It consists of two disconnected segments. Its shorter southern segment exte ...

. Around 1935, that route was realigned east from Britton to what is now South Dakota Highway 27. The old route became Highway 9, and linked up with the corresponding

North Dakota Highway 9 North Dakota Highway 9 (ND 9) is a state highway in eastern North Dakota. It follows a zigzag pattern from U.S. Route 52 (US 52) and US 281 at Melville to ND 1 outside of Rogers. ND 9 originally extended to Canada, and ...

. SD 9 was dropped around 1950, and is currently unnumbered.

Highway 12

South Dakota Highway 12 was a state route that ran across north central and northeast

. South Dakota 12 was one of the numbers assigned to the

Glacier Trail A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as ...

. In 1926,

U.S. Highway 12 U.S. Route 12 (US 12) is an east–west United States highway, running from Aberdeen, Washington, to Detroit, Michigan, for almost . The highway has mostly been superseded by Interstate 90 (I-90) and I-94, but unlike most U.S. routes that ...

was implemented, and ran 15 or to the south (US 12 was South Dakota 16 before that). Because the two Highway 12 routes were so close, the state highway was redesignated as

South Dakota Highway 10 South Dakota Highway 10 (SD 10) is a state highway in the north-central and northeastern portions of South Dakota, United States. It connects SD 1804 in Pollock with the Minnesota state line southeast of Sisseton. SD 10 wa ...

in 1927.

Highway 16

South Dakota Highway 16 was a state route running across much of northern

. South Dakota 16 was designated in the 1920s, as a number for the

Yellowstone Trail The Yellowstone Trail was the first transcontinental automobile highway through the upper tier of states in the United States, established on May 23, 1912. It was an Auto Trail that ran from the Atlantic Ocean in Plymouth, Massachusetts, throug ...

across the state. When the U.S. highway system was implemented in 1926, this road was designated as part of

. After a short period of dual signage, the SD 16 designation was dropped.

Highway 18

South Dakota Highway 18 was a state route located in northwest and north central

. South Dakota 18 was first designated in the mid-1920s, running from the

Montana Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Columbi ...

border to near Mobridge. Shortly afterward,

was implemented across the southern portion of the state. The northern highway 18 was redesignated as South Dakota Highway 8 around 1935. It is currently part of

South Dakota Highway 20 South Dakota Highway 20 (SD 20) is a state highway in northern South Dakota, United States, that connects the Montana state line, west-southwest of Camp Crook, with the Minnesota state line, east-southeast of Revillo, via Buffalo, ...

Highway 24

South Dakota Highway 24 was a state route located in west central and northwest

. When initially established in the mid-1920s, the western terminus of South Dakota 24 was at Whitewood, west of Sturgis. It traveled east along what is now

South Dakota Highway 34 South Dakota Highway 34 (SD 34) is a state route that runs parallel to Interstate 90 across the entire state of South Dakota. It begins at the Wyoming border west of Belle Fourche, as a continuation of Wyoming Highway 24 (WYO 24). The easte ...

to near Marcus, then northward to

Faith Faith, derived from Latin ''fides'' and Old French ''feid'', is confidence or trust in a person, thing, or In the context of religion, one can define faith as "belief in God or in the doctrines or teachings of religion". Religious people often ...

. This northward segment was shifted east around 1931, to what is now

South Dakota Highway 73 South Dakota Highway 73 (SD 73) is a state route that runs across western South Dakota. It begins at the Nebraska border north of Merriman, Nebraska, as a continuation of Nebraska Highway 61. It runs to the North Dakota border, where it continue ...

; it became part of the latter's alignment in 1936. Around 1940, the western terminus was pushed a bit further, to

U.S. Highway 85 U.S. Route 85 (US 85) is a north–south United States Highway that travels in the Mountain and Northern Plains states of the United States. The southern terminus of the highway is at the Mexican border in El Paso, Texas, connecting wi ...

. A branch of SD 24, called South Dakota Highway 24A, extended northwest from Whitewood to

Belle Fourche Belle Fourche (; ) is a city in and the county seat of Butte County, South Dakota, United States. Its population was 5,617 at the 2020 census. It is near the geographic center of the United States, which moved some 550 miles northwest from the g ...

. The mainline SD 24 was rerouted over this branch around 1948, to its new terminus at Belle Fourche. A further extension was made in the early 1950s west from Belle Fourche to the

Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the south ...

border. Between 1957 and 1960, the route was eliminated by a westward extension of SD 34.

Highway 24A

South Dakota Highway 24A was a state route located in the northern

Black Hills The Black Hills ( lkt, Ȟe Sápa; chy, Moʼȯhta-voʼhonáaeva; hid, awaxaawi shiibisha) is an isolated mountain range rising from the Great Plains of North America in western South Dakota and extending into Wyoming, United States. Black Elk P ...

. SD 24A was implemented around 1940, as a branch off SD 24 to

. By 1948, the mainline South Dakota 24 was rerouted onto this alignment when

U.S. Highway 14 U.S. Route 14 (abbreviated U.S. 14 or US 14), an east–west route, is one of the original United States highways of 1926. It currently has a length of 1,398 miles (2,250 km), but it had a peak length of 1,429 miles (2,300 km). For ...

was realigned. This route is currently part of

Highway 27

South Dakota Highway 27 (SD 27) was a

state highway A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either ''numbered'' or ''maintained'' by a sub-national state or province. A road numbered by a ...

that existed in the southeastern part of the U.S. state of

. It was established in 1926 from SD 50, northeast of

Tabor Tabor may refer to: Places Czech Republic * Tábor, a town in the South Bohemian Region ** Tábor District, the surrounding district * Tábor, a village and part of Velké Heraltice in the Moravian-Silesian Region Israel * Mount Tabor, Galilee ...

, to U.S. Route 18 (US 18), west of Olivet. By 1936, it was redesignated as part of SD 35.

Highway 35

South Dakota Highway 35 was a state route located in southeast

. This route was established around 1935, as a renumbering of South Dakota Highway 27. At that time, SD 27's northern terminus was at

; SD 35 was extended north to

South Dakota Highway 42 South Dakota Highway 42 (SD 42) is a segmented state highway in southeastern South Dakota, United States. The first segment is a highway in Aurora County. The second and longest is long and connects Ethan and Sioux Falls. The final segm ...

. The route was deleted in 1976. The segment south of U.S. 18 became part of a split

; the segment to the north is unnumbered.

Highway 41

South Dakota Highway 41 was a state route located in eastern

. South Dakota 41 was the original designation of

U.S. Highway 281 U.S. Route 281 (US 281) is a north–south United States Numbered Highway. At it is the longest continuous three-digit U.S. Route. The highway's northern terminus is at the International Peace Garden, north of Dunseith, North Dakota, at t ...

in the state. When assigned in the mid-1920s, SD 41 ran nearly the entire length of the state north to south. A gap existed between

and

east of

Wessington Springs Wessington Springs is a city in central Jerauld County, South Dakota, United States. The population was 956 at the 2010 census. It is the county seat of Jerauld County. History The Wessington Springs townsite was founded in 1880 and platted i ...

; this was completed by 1929. When U.S. 281 was assigned in the early 1930s, it was routed along the SD 41 alignment between the

North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the Native Americans in the United States, indigenous Dakota people, Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north a ...

border and U.S. 14. SD 41 remained separate south from there, as U.S. 281 continued south via

Huron Huron may refer to: People * Wyandot people (or Wendat), indigenous to North America * Wyandot language, spoken by them * Huron-Wendat Nation, a Huron-Wendat First Nation with a community in Wendake, Quebec * Nottawaseppi Huron Band of Potawatomi ...

and

Mitchell Mitchell may refer to: People *Mitchell (surname) *Mitchell (given name) Places Australia * Mitchell, Australian Capital Territory, a light-industrial estate * Mitchell, New South Wales, a suburb of Bathurst * Mitchell, Northern Territo ...

. By 1933, this segment of U.S. 281 was moved onto SD 41 as well, southward to U.S. Highway 16 at Plankinton. Around 1936, the dual signage was dropped, and the northern terminus of SD 41 was located at Plankinton. No changes took place in the 1940s, however, in the early 1950s, another alignment change in U.S. 281 took over the remainder of SD 41, and the number was discontinued.

Highway 54

South Dakota Highway 54 was a short state route in southeast

Gregory County, South Dakota Gregory County is a County (United States), county in the U.S. state of South Dakota. As of the 2020 United States census, 2020 census, the population was 3,994. Its county seat is Burke, South Dakota, Burke. The county was created in 1862 and o ...

. South Dakota 54 was implemented around 1926 as part of the state highway network. Its western terminus was at

South Dakota Highway 50 South Dakota Highway 50 (SD 50) is a state route serving south central and southeast South Dakota. The current alignment begins at the junction of South Dakota Highway 34 at "Lee's Corner" east of Fort Thompson, and ends at the Iowa border near ...

(present day

) at Bonesteel. It ran south and east through Fairfax to the

Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...

border. By 1935, it was pulled back to Fairfax, at the intersection with the new

. Around 1953, due to the pending flooding of its old alignment, U.S. 18 was rerouted south onto this route, and SD 54 was limited to a segment north of the border. This last segment was eliminated around 1960, when U.S. 281 was rerouted onto it.

Highway 59

South Dakota Highway 59 was a state route in south central

. South Dakota 59 was implemented in 1927 as a renumbering of part of

South Dakota Highway 63 South Dakota Highway 63 (SD 63) is a state highway in central South Dakota, United States, that connects U.S. Route 18 (US 18) south-southeast of Parmelee with the North Dakota state line north of McLaughlin. It consists ...

, which was truncated. Its northern terminus was at U.S. Highway 16 in Murdo, and traveled south via White River to

Mission Mission (from Latin ''missio'' "the act of sending out") may refer to: Organised activities Religion *Christian mission, an organized effort to spread Christianity *Mission (LDS Church), an administrative area of The Church of Jesus Christ of ...

(

, present day

). The southern terminus was extended to the

border north of

Valentine, Nebraska Valentine is a city in Cherry County, Nebraska, United States. The population was 2,737 at the 2010 census. It is the county seat of Cherry County. History Valentine was founded in 1882. The Valentine post office was established on December 4, ...

, by 1929. Around 1932,

U.S. Highway 183 U.S. Route 183 (US 183) is a north–south United States highway. The highway's northern terminus is in Presho, South Dakota, at an intersection with Interstate 90. Its southern terminus is in Refugio, Texas, at the southern intersection ...

was implemented along the entire alignment of SD 59. The dual signage was removed by 1935. The road became part of

U.S. Highway 83 U.S. Route 83 (US 83) is a major north–south United States Numbered Highway that extends in the central United States. Only four other north–south routes are longer: US 1, US 41, US 59, and US 87, while US ...

in the 1940s, when the alignments of U.S. 83 and U.S. 183 were swapped.

Highway 298

South Dakota State Highway 298 served the former Black Hills Ordnance Depot at Igloo, in far southwest South Dakota ( Fall River County). South Dakota 298 extended from the depot to

South Dakota Highway 471 South Dakota Highway 471 (SD 471) is a state highway in western Fall River, South Dakota, United States, that connects Highway 71 (SD 71), southeast of Rumford, with U.S. Route 18 (US 18), in Edgemont. Route descr ...

northeast of Igloo. It was decommissioned in 1998.

References

{{reflist, refs= {{cite web , url=https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~33755~1171471:Rand-McNally-junior-auto-road-map-S?sort=Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No&qvq=q:south%2Bdakota;sort:Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No;lc:RUMSEY~8~1&mi=132&trs=138, title = South Dakota

Former A former is an object, such as a template, gauge or cutting die, which is used to form something such as a boat's hull. Typically, a former gives shape to a structure that may have complex curvature. A former may become an integral part of the ...