Alignment: SD-45 near Gann Valley to US-81 east of Oldham.

History and Notes: Designated in the late 1940's, this route ran parallel to and between US-14 and SD-34. By 1954, only the segment between SD-25 and US-81 remained, and this was dropped between 1965 and 1970. The segment of the original alignment between US-281 and SD-37 was designated as SD-224 in 1976.

Alignment: I-29 at Exit 114 to SD-13 at Flandreau.

Distance: 12 miles.

Intersecting Interstates: I-29 west of Flandreau.

History and Notes: Route assigned around 1970.

Alignment: BIA-41 east of Slim Buttes to Pine Ridge (US-18).

History and Notes: Part of the Bureau of Indian Affairs (BIA) highway system; runs through the Pine Ridge Indian Reservation.

Alignment: Badlands Visitors Center to Manderson (BIA-28).

History and Notes: Part of the Bureau of Indian Affairs (BIA) highway system; runs through the Pine Ridge Indian Reservation.

Alignment: Wyoming border (WY-24) west of Belle Fourche to Minnesota border (MN-30) southeast of Flandreau.

Distance: 431 miles.

Freeway: Whitewood to Sturgis (co-sign with I-90).

Multi-lane Segments: Pierre; Madison to SD-19 (co-sign with US-81).

Intersecting Interstates: I-29 at Colman; I-90 at Whitewood and Sturgis.

Multiplexing: Shared alignment with I-90 and US-14 from Whitewood to Sturgis; with SD-79 from Sturgis to 4 miles east of Sturgis; with SD-73 from Howes to Billsburg; with US-14 from SD-63 to Pierre; with SD-47 from Stephan to Ft. Thompson; with SD-37 from 3 miles east of Woonsocket to 4 miles east of Forestburg; with SD-25 from 1 mile east of Roswell to 1 mile west of Howard; and with US-81 from 1 mile northwest of Winfred to Madison.

Lewis and Clark Trail: Pierre to SD-50.

History and Notes: In 1932, the western extent of SD-34 was at the SD-45 junction north of Gann Valley. By the early 1950's, the road was extended west to end in Pierre. A further extension was made around 1960, when was extended past SD-73 and absorbed the former SD-34 to the Wyoming border.

The VFW name designation was passed by the South Dakota legislature in 2000.

Attractions Along the Way: Sturgis Motorcycle Rally (Sturgis); National Motorcycle Museum & Hall of Fame (Sturgis); Poker Alice House (Sturgis); Old Ft. Meade Museum (east of Sturgis); Bear Butte State Park (northeast of Sturgis): Fort Pierre (Ft. Pierre); Verendrye Monument (Ft. Pierre); State Capitol (Pierre); Oahe Dam (north of Pierre); Oahe Chapel (north of Pierre); South Dakota State Museum (Pierre); South Dakota National Guard Museum (Pierre); South Dakota Discovery Center and Aquarium (Pierre); World War II Memorial (under construction in Pierre);Lake Herman State Park (Madison); Prairie Village (Madison)

Links: US-14/83/SD-34 intersection reconstruction in Ft. Pierre (SD Dept. of Transportation), Mr. Yamamoto's SD-34 Page

Alignment: SD-42 southwest of Emery to SD-50 east of Tyndall.

History and Notes: Designation in place by 1936. The segment south of US-18 was renumbered as a part of SD-25 in 1976; the northern segment is currently an unnumbered county road.

Alignment: SD-79 south of Hermosa to Custer (ALT US-16/SD-89).

Distance: 26 miles.

Multiplexing: Shared alignment with ALT US-16 from Custer to the east edge of Custer State Park; with SD-87 for 3 miles east of Custer.

History and notes: Original alignment of SD-36 (1926) had the road extending along the current ALT-16 and US-16, ending at the Wyoming border. This was trimmed back by 1936. The road also served as US-216 in 1934.

Attractions Along the Way: Custer State Park (east of Custer); Black Hills Playhouse (northern part of Custer State Park); Flintstones Bedrock City (Custer); National Museum of Woodcarving (west of Custer); Custer County 1881 Courthouse (Custer).

Links: Mr. Yamamoto's SD-36 Page

Alignment: North Dakota border (ND-1) north of Hecla to Nebraska border (NE-14)at Running Water.

Distance: 242 miles.

Multi-lane Segments: Huron to east of Woonsocket; Mitchell (I-90) to Sanborn County border.

Freeway Segments: Mitchell (co-signed with I-90).

NHS: Huron to Tyndall.

Multiplexing: Shared alignment with SD-10 for 2 miles northeast of Houghton; with SD-20 for 3 miles south from Conde; with US-212 for 5 miles west from Doland; with SD-34 from 3 miles east of Woonsocket to 4 miles southeast of Forestburg; with I-90 for 2 miles through Mitchell; with SD-50 from 1 mile west of Tyndall to 5 miles west of Tyndall.

Lewis and Clark Trail: Segment multiplexed with SD-50.

History and Notes: Alignment in place by 1932. The Huron to US-18 segment was co-signed as US-281 until around 1936.

A new bridge across the Missouri River opened in 1998. Local residents had lobbied for the bridge for decades, as there was no crossing point for 40 miles in either direction.

SD-37 was realigned in the Mitchell area in 1999. Instead of going through town as in the past, it extends along the west edge of town to I-90, then multiplexes with I-90 to exit 332, before continuing south as before.

Attractions Along the Way: South Dakota State Fair (Huron); Dakotaland Museum (Huron); Pyle House (Huron); Corn Palace (Mitchell); Soukup and Thomas International Balloon and Airship Museum (Mitchell); Enchanted World Doll Museum (Mitchell); Oscar Howe Art Center (Mitchell); Prehistoric Indian Village (north of Mitchell)

Alignment: US-18 north of Tripp to SD-37 south of Tripp.

Distance: 1 mile.

History and Notes: One of the few remaining "suffixed" state routes.

Alignment: Business Loop I-90 in Mitchell to I-29 northwest of Sioux Falls.

Distance: 61 miles.

Intersecting Interstates: I-90 near Buffalo Ridge; I-29 northwest of Sioux Falls.

Multiplexing: Shared alignment with SD-19 through Humboldt.

History and Notes: Alignment in 1932 was a bit further north, especially in the segment west from SD-19. This was gradually moved to the current routing in the late 1940's and early 1950's.

The original east end of SD-38 was at the Iowa border, about a mile west of the Minnesota border at the old town of Benclare. Around 1940, SD-38 was realigned southeast from Sioux Falls to enter Iowa about a mile west of Benclare. This configuration remained in place until around 1995, when the east end of SD-38 was truncated to I-29. The old alignment between Sioux Falls and the Iowa line was replaced by a SD-42 extension.

Attractions Along the Way: Corn Palace (Mitchell); Enchanted World Doll Museum (Mitchell); Soukup and Thomas International Balloon and Airship Museum (Mitchell); Oscar Howe Art Center (Mitchell); Great Plains Zoo and Delbridge Museum (Sioux Falls); USS South Dakota Memorial (Sioux Falls); Old Courthouse Museum (Sioux Falls).

Alignment: Northern junction of I-29/SD-38 to SD-38, running along north and east sides of Sioux Falls.

History and Notes: Designated around 1955, but decommissioned in 1994. This route is now unnumbered (except for the previous multiplexed segments).

Alignment: Pactola to Iowa border east of Sioux Falls.

History and Notes: Original 1926 routing of SD-40 extended from current US-385 west of Rapid City, then east along current SD-44, through the Badlands (old ALT US-16, now SD-240) to Belvidere, then south and east along current SD-63 and SD-44. Was co-signed as US-83 (now US-183) north to Presho, then along US-16 from Fulton east to the Iowa border. By 1936, the east end of SD-40 was truncated at US-83 (current US-183) near Witten.

In the late 1960's, SD-40 was rerouted to go southeast from the Badlands to SD-73 east of Wanblee. The old alignment of SD-40 between Belvidere and west of Cedar Butte became an extension of SD-63.

In the early 1970's, the entire route was redesignated as SD-44, which had been extending its way westward in the 1950's and 1960's. A new SD-40 was implemented in 1976 about 15 miles further south, in Pennington and Custer Counties.

Alignment: ALT-US-16 at Keystone to Red Shirt (BIA-41).

Distance: 37 miles.

Multiplexing: Brief shared alignment with SD-79 near Hermosa.

Unpaved Segments: Hayward to Hermosa.

History and Notes: This route was designated in 1976. The SD-40 designation had previously been used on what is now SD-44.

Attractions Along the Way: Mount Rushmore National Memorial (Keystone); Beautiful Rushmore Cave (Keystone); Borglum Historical Center (Keystone); Big Thunder Gold Mine (Keystone); 1880 Train (Keystone); Black Hills Caverns (Rapid City); The Journey Museum (Rapid City); Badlands National Park (Red Shirt)

Alignment: Interior to Cedar Falls.

History and Notes: This was a spur off the old SD-40 (current SD-44) alignment, on the southeast edge of the Badlands. It linked SD-40 with Alternate US-16, after SD-40 was rerouted southeast from the Badlands instead of northeast. Designated around 1970, it became SD-377 in 1976.

Alignment: SD-40 at Red Shirt to Nebraska border southwest of Pine Ridge.

Multiplexing: Shared alignment with US-18 for 2 miles west of Oglala.

History and Notes: Part of the Bureau of Indian Affairs (BIA) highway system; runs through the Pine Ridge Indian Reservation.

Alignment: US-18 near Armour to North Dakota border near Hecla.

History and Notes: In place in 1926, the northern half of this route (north from Wolsey) became multiplexed with US-281 in the early 1930's. The multiplexed segments were dropped by 1936, and the north end of SD-41 was truncated to US-16 near Plankinton. The remaining segment, from Plankinton to US-18, was dropped in the early 1950's when the segment of US-281 south of Plankinton was realigned onto SD-41.

Alignment: US-281 near Stickney to Iowa border (IA-9) near Rowena.

Distance: 106 miles.

Intersecting Interstates: I-29 on west side of Sioux Falls; I-229 on east side of Sioux Falls.

Multi-lane Segments: Sioux Falls.

Multiplexing: Shared alignment with SD-11 from the far east side of Sioux Falls to 2 miles west of Rowena; with BUSN I-29 and BUSN I-229 in Sioux Falls.

History and Notes: The original SD-42 was designated around 1936, only consisting of the Ethan to Bridgewater segment. Around 1977, the route was extended east to SD-38 in Sioux Falls, after US-16 was realigned onto I-90.

Around 1994, SD-42 was extended east from its previous terminus at West St. in Sioux Falls, replacing the SD-38 alignment to the Iowa border.

A new 6 mile segment of SD-42, betwen US-281 and the Davison County line, was introduced in the 1990's.

Attractions Along the Way: USS South Dakota Memorial, Washington Pavilion of Arts and Sciences, Old Courthouse Museum, Great Plains Zoo and Delbridge Museum, Center for Western Studies (all in Sioux Falls)

Alignment: Pukwana to old US-18 west of Lake Andes.

History and Notes: Designated by 1932, but changed to an extension of SD-50 around 1940.

Alignment: US-18 south of Fairfax to Nebraska border (NE-11) south of Fairfax.

Distance: 1 mile.

History and Notes: Designated around 1976. This road was US-281's original entrance into South Dakota. US-281 was moved about 9 miles east by 1962.

Links: Mr. Yamamoto's SD-43 Page

Alignment: US-385 east of Silver City to I-29 near Worthing.

Distance: 382 miles

Intersecting Interstates: I-29 near Worthing.

Multiplexing: Shared alignment with SD-79 through Rapid City; with US-83 for 3 miles south from White River; with US-183 from 3 miles east of Witten to 10 miles west of Winner; with US-18 from 10 miles west of Winner to Winner; with SD-50 from 2 miles east of the Missouri River to 7 miles east of Platte; with US-281 from 3 miles south of Corsica to 5 miles north of Armour; with SD-37 from Parker to 4 miles southeast of Parker.

Lewis and Clark Trail: Platte to Douglas County line.

History and Notes: The original SD-44, in 1936, only existed from SD-19 near Parker to US-77 (now SD-115) near Worthing. By 1957, a second segment was added, from west of Platte to SD-37 near Parkston. By 1962, the segment in between (from SD-37 to SD-19) was added, with a planned extension westward to Winner; the road had reached Lake Francis Case by 1965, and by 1971, it was open to near Dixon (SD-47). Then by 1975, the extension to Winner was added, and SD-44 took over a large part of the SD-40 alignment. This westward extension from Winner utilized SD-40 to near the Washabaugh (now Jackson) and Mellette county lines, then west along a new road to near Potato Creek, north to Interior in the Badlands, then west again along old SD-40 to US-385.

Attractions Along the Way: Black Hills Caverns (west of Rapid City); Chapel in the Hills (west of Rapid City); Dinosaur Park (Rapid City); Museum of Geology (Rapid City); Badlands National Park (Interior)

Alignment: North Dakota border (ND-3) south of Ashley, ND, to Platte (SD-44/SD-50).

Distance: 198 miles

Freeway: Kimball to 6 miles east of Kimball (co-sign with I-90).

Multiplexing: Shared alignment with SD-10 from 12 miles east of Eureka to Leola; with US-12 for 5 miles east from Ipswich; with SD-20 for 2 miles west of Cresbard; with US-212 from 5 miles east of Faulkton to 9 miles west of Rockham; with SD-26 for 1 mile in northern Hand County; with US-14 through Miller; with I-90 for 6 miles east from Kimball.

History and Notes: In place by 1932, with the south end at the Missouri River at the old town of Wheeler. By 1936, it was truncated at Kimball (US-16), with US-281 implemented on the US-16 to Wheeler segment. In the early 1950's, this US-281 segment was relocated to replace the remaining SD-41 several miles east, and SD-45 was extended onto the old US-281 alignment to end at SD-50. Around 1970, SD-50 had been realigned to intersect SD-44 west of Platte, and SD-45 was extended south along the old alignment to Platte, where it remains today.

On the north end, the route has remained in its current configuration since 1936.

Attractions Along the Way: Prayer Rock (Ipswich); 1935 Stratosphere Balloon Landing Site (southeast of Kimball)

Alignment: US-18/US-281 at Pickstown to Iowa border (IA-10) south of Hudson.

Distance: 107 miles

Multiplexing: Shared alignment with SD-50 from Wagner to 8 miles east of Wagner; with SD-19 from 4 miles east of Irene to 2 miles south of Centerville.

Lewis and Clark Trail: Pickstown to SD-50 near the Bon Homme County line.

History and Notes: The original alignment (circa 1936) only included the segment east from US-81. The western portion came into place between 1957 and 1962.

Attractions Along the Way: Fort Randall (Pickstown); Fort Randall Dam (Pickstown)

Alignment: West of Hudson to SD-46.

History and Notes: A short spur off SD-46, designated around 1970. This was changed to SD-103 in 1976.

Alignment: North Dakota border north of Eureka to Nebraska border (NE-137) south of Burke.

Distance: 245 miles.

Intersecting Interstates: I-90 southeast of Reliance.

Multiplexing: Shared alignment with SD-10 through Eureka; with US-12 for 7 miles west from Bowdle; with SD-20 from Hoven to 3 miles south of Hoven; with US-212 from 1 mile south of Lebanon to 3 miles east of Seneca; with SD-34 from near Stephan to Ft. Thompson; with US-18 from Gregory to Burke.

Lewis and Clark Trail: North edge of Crow Creek Indian Reservation to Burke.

History and Notes: Originally (circa 1932), SD-47 only extended from Pukwana to SD-45, along what is now a part of SD-50. By 1936, it had been extended north to Highmore.

Around 1939, the segment south of Pukwana became part of SD-43. SD-47 was rerouted west from Chamberlain to Oacoma, then south to Gregory.

Between 1948 and 1953, the south end of SD-47 was extended along US-18 from Gregory to Burke, then south to the Nebraska border.

Around 1955, the Oacoma to Iona segment was relocated further west, intersecting US-16 near Reliance. North from Reliance, a new road to Fort Thompson was built around 1965, and was designated SD-47W. In addition, SD-47 was extended north from Highmore to US-212, then west to Lebanon, north to US-12, east to Bowdle, north to Eureka. Around 1965, this was extended north to the North Dakota line.

By 1976, SD-47 was realigned again in central South Dakota. The new and improved alignment replaced SD-47W, with the Chamberlain to Fort Thompson segment designated as an extension of SD-50.

Attractions Along the Way: Eureka Pioneer Museum (Eureka); Cathedral on the Prairie (Hoven); Big Bend Dam (Fort Thompson)

Alignment: Reliance to Fort Thompson.

History and Notes: A new road built around 1965, the designation was changed to SD-47 in 1976 after the main route was realigned.

Alignment: I-29 west of Spink to Iowa border (IA-403) west of Akron, IA.

Distance: 13 miles.

Intersecting Interstates: I-29 west of Spink.

History and Notes: Designation assigned between 1948 and 1953.

Alignment: SD-47 southwest of Oacoma to US-18 at Colome.

Distance: 37 miles.

History and Notes: Route assignment given in 1976; was previously designated as SD-147.

Alignment: SD-34 east of Fort Thompson to Iowa border (IA-3) at Richland.

Distance: 215 miles.

Freeway: Chamberlain to Pukwana (co-sign with I-90).

Multi-lane Segments: Yankton; James River east of Yankton to I-29.

Intersecting Interstates: I-90 at Chamberlain and Pukwana; I-29 at Junction City.

Multiplexing: Shared alignment with BUSN I-90 from Chamberlain to I-90; with I-90 from near Chamberlain to south of Pukwana; with SD-44 from 2 miles east of the Missouri River to 8 miles east of Platte; with US-18 and US-281 from Lake Andes to 4 miles east of Ravinia; with SD-46 for 8 miles east from Wagner; with SD-37 from 5 miles east of Avon to 1 mile west of Tyndall; with SD-52 for 5 miles between Tabor and Yankton; with US-81 through Yankton.

Spurs and Alternates: Business SD-50 through Vermillion (along original SD-50 alignment, simply labeled "Business Route").

Lewis and Clark Trail: SD-34 to Lake Andes; Wagner to I-29.

History and Notes: Original routing of SD-50 (1926) had the route using what is now US-18 from the Wyoming border to Bonesteel, then using current SD-50 to current I-29, and extending south to Sioux City, IA. By 1936, the west end was truncated to US-18 northwest of Wagner. Around 1940, the west end was brought northwest to Pukwana, absorbing old SD-43.

Around 1950, the east end of SD-50 was rerouted of the US-77 alignment, and headed east to the Iowa border near Richland.

In 1976, SD-50 was extended west along I-90 to Chamberlain, then north along what was SD-47 to Fort Thompson, after SD-47 was rerouted over old SD-47W.

"Sunshine Highway" was the original named route of the present-day SD-50.

Attractions Along the Way: Big Bend Dam (Fort Thompson); Akta Lakota Museum (Chamberlain); South Dakota Hall of Fame (Chamberlain); Cramer-Kenyon Heritage Home (Yankton); Dakota Territorial Capitol (Yankton); Shrine to Music (Vermillion); W.H. Over State Museum (Vermillion); Austin-Whittenmore Home (Vermillion)

Alignment: Segment 1: Oglala to Oelrichs.
Segment 2: Edgemont (US-18) to SD-71 near Rumford.

History and Notes: Segment 1 existed prior to 1950, before US-18 was rerouted onto this alignment. Segment 2 existed from 1951 to 1975, and is now SD-471.

Alignment: Northwest of Springfield to Yankton (US-81).

Distance: 43 miles.

Multiplexing: Shared alignment with SD-50 for 5 miles between Tabor and the Missouri River.

History and Notes: Designated in the mid 1950's.

Attractions Along the Way: Gavins Point Dam (Yankton); Cramer-Kenyon Heritage Home (Yankton)

Alignment: US-18, 4.3 miles east of Shannon/Fall River county line, to BIA-41.

History and Notes: Part of the Bureau of Indian Affairs (BIA) highway system; runs through the west edge of the Pine Ridge Reservation.

Alignment: Segment 1: Vivian (I-90/US-83) to SD-44 east of Wood
Segment 2: US-18 west of Winner to 1 mile west of Clearfield.

Distance: Segment 1: 33 miles. Segment 2: 15 miles.

Intersecting Interstates: I-90 at Vivian

Unpaved Segments: 10 miles south of Vivian to SD-44.

History and Notes: 1926 alignment had SD-53 running north-south throughout South Dakota; the segment from Vivian to the North Dakota border evolved into US-83, and SD-53 was pulled back to Pierre in 1932. The Presho to Nebraska segment was co-signed with US-183. By 1936, the northern end of the route was truncated to Vivian, and then realigned due south to SD-40.

Segment 2 south of US-18 was added between 1965 and 1971.

Alignment: Fairfax to Nebraska border 10 miles east southeast of Fairfax.

History and Notes: A short route, implemented around 1932. It originally met NE-18. Around 1953, US-18 was rerouted onto most of this route, and SD-54 was limited to the 1 mile segment north of the border. The remaining segment was eliminated around 1960, when US-281's connection to South Dakota was moved to this road.

Alignment: Presho to near Winner.

History and Notes: 1926 alignment which followed current US-183. This was absorbed by US-83 and SD-53 by 1932.

Alignment: Murdo to Nebraska border southeast of Rosebud.

History and Notes: Previously known as SD-63, SD-59 was designated by 1931, and multiplexed with US-183 (current US-83). Designation eliminated by 1936.