Historical Highway Shields
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    SD-63
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    SD-73
    SD-75

    SD-79
    US-81
    US-83
    US-85
    SD-87

    SD-89
    I-90
    LOOP I-90
    SPUR I-90
    SPUR I-90


Historic Routes:

    SD-75
    US-77
    SD-81
    SD-83
    SD-85
    ALT US-85
    US-85E


Road Pages:

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    Highways 31-60
    Highways 61-100
    Highways 101-199
    Highways 201 +

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Chris Geelhart
Last Update: 2/27/2005
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You are at: SD Hwys > SD 61-100
US-81 in Yankton
This USGS topographic map shows the alignment of US-81 across the Missouri River at Yankton, via the Meridian Bridge (constructed in 1924). In a joint project by the South Dakota DOT and the Nebraska Department of Roads, US-81 will be rerouted south on Broadway to cross the Missouri River on a new bridge, scheduled for construction in 2006.
Current assignment Decommissioned 1950 or earlier Decommissioned 1951 to 1975 Decommissioned since 1975
Name Details
SD-63

Updated!

Updated! Alignment:
Segment 1: North Dakota border (ND-6) north of McLaughlin to SD-44 west of Cedar Butte
Segment 2: Norris to US-18 south of Parmlee

Distance: 254 miles overall

Freeway: Belvidere to 7 miles east of Belvidere (co-sign with I-90)

Intersecting Interstates: I-90 at Belvidere and 7 miles east of Belvidere

Multiplexing: Shared alignment with BIA-4 for 1 mile, south of Little Eagle; with SD-20 from 5 miles west of Trail City to 5 miles northeast of Timber Lake; with US-212 from 4 miles east of Eagle Butte to 2 miles west of Eagle Butte; with US-14 from SD-34 to Midland; with I-90 for 7 miles east from Belvidere

Unpaved Segments: 5 miles south of Belvidere to SD-44

Updated! History and Notes: A southern portion of SD-63 (mid 1920's) originally ran from Kadoka to Nebraska border along current SD-73. This changed around 1934, when SD-63 was pulled back to end at US-14, and the old southern segment became part of SD-73.

Route extensions were made in the 1960's. Around 1960, SD-63 was extended south to US-16 near Stamford. By 1965, it was multiplexed with SD-40 south from Belvidere, ending west of Cedar Butte. By 1971, it was extended to US-18 near Parmlee, where it remains today.

On the north end, SD-63 originally did not exist between US-12 and SD-8 (current SD-20), and the north end was at Timber Lake. Between 1948 and 1953, the road was realigned to start about 3 miles east of Firesteel. Between 1965 and 1971, the far northern segment was extended south from McLaughlin to SD-20, then west to meet up with the other segment.

SD-65
Black Hills Lake Metigoshe Trail

Updated!

Alignment: North Dakota border (ND-31) near McIntosh to US-212 east of Dupree

Distance: 68 miles

Multiplexing: Shared alignment with US-12 for a short distance east of McIntosh; with SD-20 for 4 miles west from Isabel

Updated!History and Notes: SD-65 originally (mid 1920's) existed in 3 segments; McIntosh to Grand River, Isabel to Dupree, and a southern segment from Kadoka to the Nebraska border south of Martin. The two northern segments were connected by 1932. The southern segment was changed to a part of SD-63 around 1929, and is now SD-73.

Segment beween North Dakota and US-212 was part of the "Black Hills Lake Metigoshe Trail", which extended to Sturgis.

SD-71

Updated!

Alignment: Hot Springs (BYPASS US-18) to Nebraska border (NE-2/NE-71) near Ardmore

Distance: 30 miles

Unpaved Segments: Cascade Falls to near Rumford. This is expected to be paved by 2004.

Updated! History and Notes: SD-71 is part of a multi-state Highway 71, beginning in Hot Springs, SD, and ending southwest of LaJunta, CO. Previously, it was part of SD-87. Renumbering took place in 1962.

Attractions Along the Way: Mammoth Site (Hot Springs)

Links: Mr. Yamamoto's SD-71 Page

SD-73

Alignment: North Dakota border (ND-49) at Thunder Hawk to Nebraska border (NE-61) south of Martin

Distance: 250 miles

Freeway: Kadoka to 8 miles west of Kadoka (co-sign with I-90)

Intersecting Interstates: I-90 at Kadoka and 8 miles west of Kadoka

Multiplexing: Shared alignment with US-12 from Lemmon to 1 mile east of Thunder Hawk; with SD-20 from 2 miles east of Meadow to 3 miles west of Coal Springs; with US-212 for 5 miles west from Faith; with SD-34 from Howes to Billsburg; with I-90 from Exit 143 to Kadoka; with US-18 from 7 miles south of Patricia to Martin

History and Notes: 1926 alignment only included the Lemmon to Faith segment. In the mid 1930's, the route was extended south onto what had been SD-24 to near Plainview, then southeast along a newly designated route to Philip. The route then went to Kadoka, and replaced a segment of SD-63 south to the Nebraska line.

Greg Wysk of St Cloud, MN shares some information on the north end of SD-73:

Highway 73 used to actually end at a junction with U.S. 12 at Lemmon, about 1/2 mile south of the North Dakota border. It got multiplexed with U.S. 12 through Lemmon to Thunder Hawk and connected with N.D. 49 in 1978 or so. What happened is that S.D. decided to build a railroad overpass and a short extention to connect with the finished Highway 49. Prior to that 49 ended at the border, and you had to take a gravel township road about 1 1/2 miles through Thunder Hawk to U.S. 12. What's interesting is that S.D. was originally going to call this 1/2 mile or so road another number -- Highway 69 I think (unfortunately, I don't have access to the old newspapers). But they just multiplexed 73 along 12.

Attractions Along the Way: Petrified Wood Park and Museum (Lemmon); Hugh Glass Monument (southwest of Shadehill); Badlands Petrified Gardens (Kadoka)

Old SD-75

Alignment: Segment 1: North Dakota border near Hettinger, ND, to Reva
Segment 2: US-18 to Nebraska border southeast of Denby

History and Notes: The northern segment was designated between 1948 and 1953, but was renumbered as a part of SD-79 around 1975; the SD-75 designation was then moved approximately 18 miles eastward. The southern segment was in place by 1936 (although twice as long, due to a different US-18 alignment). This segment was renumbered SD-391 in 1976.

SD-75

Alignment: Northwest Perkins County from North Dakota border (ND-8) to SD-20 east of Prairie City

Distance: 28 miles

History and Notes: The SD-75 alignment was moved from far eastern Harding County to this alignment in 1976.

Old US-77

King of Trails
King of Trails

Alignment: Minnesota border at Big Stone City to Iowa border at North Sioux City

History and Notes: This U.S. route was extended north of its previous terminus in Sioux City, IA, in 1930, to Ortonville, MN, replacing SD-15 (King of Trails highway). Followed path of current US-12, SD-15, I-29, SD-115, and SD-105.

Gradually, beginning in the 1960's, US-77 was realigned onto segments of I-29:

  • 1963: SD-50 to Jefferson
  • By 1965: Multiplex extended north to US-18
  • By 1971: Separate multiplex from 3 miles west of Dell Rapids to Brookings
  • By 1977: Northern multiplex extended from Brookings to west of Toronto
  • By 1981: Segments between Dell Rapids and US-18 (old alignment turned into SD-115), and Jefferson to North Sioux City (old alignment turned into SD-105).

The entire route was decommissioned in South Dakota in 1982, when the northern terminus was pulled back to Sioux City.

Follow US-77 across: Iowa, Nebraska, Kansas, Oklahoma, and Texas
Historical routings across: Minnesota

SD-79
Heartland Expressway

Updated!

Alignment: North Dakota border (ND-22) northeast of Ralph to US-18/US-385 east of Hot Springs

Distance: 244 miles

Freeway: Black Hawk to Sturgis (co-sign with I-90)

NHS: Newell to Hot Springs

Multi-Lane Segments: Southeast edge of Rapid City to Fairburn, as part of the Heartland Expressway. Grading and drainage work is underway on much of the remainder of the Custer County segment.

Intersecting Interstates: I-90 at Sturgis and Black Hawk

Multiplexing: Shared alignment with SD-20 for 6 miles east from Reva; with US-212 for 3 miles south from Newell; with SD-34 for 5 miles east from Sturgis; with I-90 and US-14 from Sturgis to Black Hawk; with SD-44 through Rapid City; with Truck BYPASS US-16 on the southeast side of Rapid City; with SD-40 for less than 1 mile near Hermosa

History and Notes: Original (mid 1920's) alignment had SD-79 designated for what is now US-85 north of Sturgis. After US-85 was designated (end of 1926), SD-79 was rerouted north from Sturgis, through Newell, to end at US-85 near Redig. In addition, the route continued south along US-16 (current US-14) to Rapid City, then to the Nebraska border south of Oelrichs.

In 1936, the northern alignment started at US-85 near the Harding/Butte County line, heading east to the old town of Mason, then south to meet with existing SD-79 north of Castle Rock. The ending point changed by 1971, when US-85 was rerouted northeast to near Castle Rock Buttes, and SD-79 was pulled back to intersect. In 1976, the diagonal segment from Castle Rock became SD-168, and SD-79 was extened northeast to Reva, before heading north to the North Dakota border on what had been SD-75.

The segment between Hermosa and the Nebraska line were straightened out in the 1950's. By around 1960, the south end of SD-79 was pulled back to 5 miles east of Hot Springs, with the new US-385 absorbing the old route to Nebraska.

Segment from Hot Springs to Rapid City is part of the "Heartland Expressway", which will link Denver and Rapid City. The expressway will connect with I-90 at Elk Creek Road (exit 61). The segment from Hot Springs to Hermosa is scheduled to be completed by 2005.

Attractions Along the Way: Bear Butte State Park (northeast of Sturgis); Sturgis Motorcycle Rally (Sturgis); Fort Meade Cavalry Museum (Sturgis); Sturgis Motorcycle Museum (Sturgis); Petrified Forest of the Black Hills (east of Piedmont); Chapel in the Hills (Rapid City); Dinosaur Park (Rapid City); Museum of Geology (Rapid City); The Journey Museum (Rapid City); Mammoth Site (Hot Springs)

Updated! Links: Heartland Expressway Home Page

US-81

Meridian Hwy
Meridian Highway

Pan-American Highway

Alignment: North Dakota border (I-29/US-81) near Victor to Nebraska border (US-81) at Yankton

Distance: 239 miles

Freeway: Watertown to North Dakota border (co-sign with I-29)

NHS: Entire route

Intersecting Interstates: I-29 at Watertown; I-90 near Salem

Multi-lane Segments: SD-50 to north edge of Yankton

Multiplexing: Shared alignment with I-29 from the North Dakota border to the north side of Watertown; with SD-22 for 2 miles west of Castlewood; with SD-28 for 1 mile noth from Alsville; with US-14 for 3 miles south from Arlington; with SD-34 from Madison to 2 miles northwest of Winfred; with SD-50 through Yankton

Lewis and Clark Trail: Yankton (multiplexed segment with SD-50)

History and Notes: The "Meridian Highway", US-81 was an original 1926 highway. It was initially co-signed as SD-21. It is also part of the longer Pan-American Highway, which starts in Winnipeg, Manitoba, Canada, and ends in Panama.

Little change in the route was noted over the years, except for a realignment of the segment between SD-10 and US-12 around 1950, when the road was moved about 5 miles east. Then, as I-29 was being completed, US-81 was moved onto the interstate. This occurred between Watertown and Peever, and from New Effington to the North Dakota border around 1980. This particular move resulted in the segment from New Effington to North Dakota via Rosholt to be renumbered as SD-127. By 1984, all of US-81 north of Watertown was on the interstate, and the old alignment from New Effington to Sisseton had also become part of SD-127.

On the south end, replacement of the US-81 Meridian Bridge over the Missouri River is planned to begin in 2006. The original bridge was built in 1924 for $1.1 million (approximately $11 million today), the last link in the Meridian Highway. It is a double-deck bridge, designed for trains on the lower deck and vehicles on the upper deck, with a lifting mechanism to allow for river traffic. The trains were never brought across the bridge, so it was switched to use southbound traffic on the lower deck, and northbound traffic on the upper deck. The lift mechanism was later removed. Originally a toll bridge to pay for construction, the tolls were lifted at the end of 1953.

A new bridge and alignment, a few blocks west along Broadway, has been approved by both the South Dakota DOT and the Nebraska Department of Roads. The future of the old bridge, which is on the National Register of Historic Places, is still being debated. Some plans call for it to become a pedestrian crossing, but the city of Yankton, SDDOT, or NDOR cannot afford the upkeep. No private buyers have stepped forward yet.

Attractions Along the Way: Redlin Art Center (Watertown); Arthur Mellette House (Watertown); Prairie Village (Madison); Lake Herman State Park (west of Madison); Lewis and Clark Visitors Center and Gavins Point Dam (Yankton); Dakota Territorial Capitol (Yankton); Cramer-Kenyon Heritage Home (Yankton)

Follow US-81 across: North Dakota, Nebraska, Kansas, Oklahoma, and Texas

Old SD-81

Alignment: Sylvan Lake to Wind Cave National Park

History and Notes: Designated by 1926, this was the original designation of SD-87. Route designation changed around 1936.

US-83
Pearl Harbor Memorial Highway

Updated!

Alignment: North Dakota border (US-83) north of Herreid to Nebraska border (US-83) north of Valentine, NE

Distance: 242 miles

Freeway: Murdo to Vivian (co-sign with I-90)

NHS: Entire route

Multi-lane Segments: US-12 junctions north and south of Selby; Pierre to Jct. BYPASS US-83; I-90 to 9 miles north of I-90.

Spurs and Alternates: BYPASS US-83 east of Pierre, from the SD-34 junction north to US-83/US-14

Multiplexing: Shared alignment with SD-10 from 2 miles south of the North Dakota border to 3 miles north of Mound City; with US-12 from 5 miles northwest of Selby to 4 miles south of Selby; with SD-20 from 5 miles northwest of Selby to the Walworth/Potter County line; with US-212 for 1 mile, west of Gettysburg; with US-14 from 5 miles west of Blunt to Ft. Pierre; with SD-34 through the west part of Pierre; with I-90 from Vivian to Murdo; with SD-44 for 3 miles south from White River; with US-18 for 3 miles west from Mission

Lewis and Clark Trail: North jct. US-12 to US-212; Pierre

History and Notes: Segment from Pierre northward was assigned in 1927, following the old SD-53 routing. Improvements over the years in this segment include a diagonal route to west of Blunt, completed in the mid 1930's, and relocation of the US-212 to SD-144 segment (6 miles west of previous alignment) to straighten the route, completed between 1944 and 1948.

The segment between Pierre and the Nebraska line was designated by 1932. However, the routing was basically reversed with what is now US-183. The US-83 extension went from Pierre to Vivian, then east to Presho. From there, it extended south, then east to Winner. US-83 entered Nebraska south of Colome. By 1944, the alignment changed to head west from Vivian, then south from Murdo. This is the basic alignment in use today.

The Pearl Harbor Memorial Highway designation (US-83 segment from I-90 to Ft. Pierre) was passed by the South Dakota legislature in 2000.

Construction began in August 2002 on upgrading US-83 to an expressway between Fort Pierre and I-90. The southernmost 9 miles opened on October 20, 2003. Work has begun on the remaining segments between Pierre and I-90. The entire expressway should be completed in 2005.

Updated! Attractions Along the Way: Bangor Monument (south of Selby); Fort Pierre (Ft. Pierre); Verendrye Monument (Ft. Pierre); State Capitol (Pierre); South Dakota Discovery Center and Aquarium (Pierre); South Dakota National Guard Museum (Pierre); World War II Memorial (Pierre); South Dakota State Museum (Pierre); Oahe Dam (north of Pierre)

Follow US-83 across: North Dakota, Nebraska, Kansas, Oklahoma, and Texas

Old SD-83

Potash Highway
Potash Highway

Alignment: Deadwood to Hot Springs

History and Notes: Previously known as the "Potash Highway", this number was designated in 1927, replacing SD-85. Around that time US-85 was designated on its current alignment, and US-85 and SD-85 intersected. Around 1931, the designation was changed to US-85E, then to ALT US-85 by 1936. It was renumbered as US-385 in 1958.

Old SD-85

Potash Highway
Potash Highway

Alignment: Lead to Hot Springs

History and Notes: Original mid 1920's designation for what is now US-385. Around 1929, this was changed to SD-83, because SD-85 intersected with the new US-85 at Lead. Designation was later changed to US-85E around 1931, ALT US-85 around 1936, and to US-385 in 1958.

US-85 Shield

CanAm Highway
Canam Highway

Updated!

Alignment: North Dakota border (US-85) north of Ludlow to Wyoming border (US-85) southwest of Lead

Distance: 156 miles

Freeway: Spearfish to near Elkhorn Peak ("Centennial Prairie") (co-sign with I-90)

NHS: Entire route

Intersecting Interstates: I-90 at Spearfish and north of Deadwood

Multiplexing: Shared alignment with SD-20 for 2 miles south from Buffalo; with I-90 and US-14 from Spearfish to west of Elkhorn Peak ("Centennial Prairie"); with ALT US-14 from northeast of Deadwood to Cheyenne Crossing

Multi-lane Segments: 2 mile stretch south from I-90, to the north of Deadwood. The segment from I-90 to Belle Fourche is expected to become 4 lanes by 2004.

History and Notes: Original 1926 highway, known as the "Canam Highway". The basic alignment has remained in place since then, except for some straightening of the Harding and Butte County segments in the 1950's.

Updated! Attractions Along the Way: Geographical Center of the U.S. (northeast of Belle Fourche, at Jct. SD-168); High Plains Western Heritage Center (Spearfish); Matthews Opera House (Spearfish); Black Hills Passion Play (Spearfish); Preacher Smith Monument (north of Deadwood); Calamity Jane and Wild Bill Hickok Graves (Deadwood); Broken Boot Gold Mine (Deadwood); Homestake Gold Mine site (Lead); Black Hills Mining Museum (Lead); Deer Mountain Ski Area (southwest of Lead)

Follow US-85 across: North Dakota, Wyoming, Colorado, New Mexico, and Texas

Old US-85E Shield

Potash Highway
Potash Highway

Alignment: US-85 at Pluma to Nebraska border south of Oelrichs

History and Notes: An early designation of US-385, used in the early 1930's. Previously had been numbered as SD-83. Designation was changed to ALT US-85 around 1936, then to US-385 in 1958.

Old US-85A Shield

Potash Highway
Potash Highway

Alignment: Deadwood to Wyoming border west of Edgemont

History and Notes: This route followed what is now US-385 from Deadwood to Hot Springs, and was co-signed with US-18 from Hot Springs westward. The designation was created between 1932 and 1936. It was replaced in 1958 with the US-385 designation.

SD-87

Updated!

Alignment: US-16/ US-385 at St. Elmo Peak to US-385 near Wind Cave

Distance: 40 miles

Updated! History and Notes: Designated around 1936, replacing SD-81, and extended south to the Nebraska border at Ardmore (the previous end was at the current location). The Hot Springs to Nebraska segment was renumbered as SD-71 in 1962, and the south end of SD-87 was pulled back to US-385 at Wind Cave National Park.

Closed during the winter.

Attractions Along the Way: Harney Peak, highest point in South Dakota (south of Hill City); Custer State Park (east of Custer); Wind Cave National Park (north of Hot Springs)

Links: Mr. Yamamoto's SD-87 Page

SD-89

Alignment: US-18 west of Hot Springs to SD-87 near Sylvan Lake

Distance: 40 miles

Multiplexing: Shared alignment with ALT US-16 through Custer; with US-385 from Custer to Pringle

History and Notes: Original (circa 1950) alignment was from Spearfish to west of Hot Springs near Minnekahta Flats. The northern segments were later replaced by ALT US-14 and Forest Service roads. The Custer to Sylvan Lake segment was once (pre-1957) part of an old ALT US-85 alignment.

Attractions Along the Way: Cathedral Spires (north of Custer); The Needles (north of Custer); Custer County 1881 Courthouse (Custer); Flintstones Bedrock City (Custer); National Museum of Woodcarving (west of Custer)

Links: Mr. Yamamoto's SD-89 Page

I-90

Exit Listings

Updated!

Alignment: Wyoming border (I-90/ US-14) northwest of Spearfish to Minnesota border (I-90) east of Sioux Falls

Distance: 412.76 miles

Intersecting Interstates: I-190 in Rapid City; I-29 and I-229, both in Sioux Falls

NHS: Entire length

Multiplexing: Shared alignment with US-14 from the Wyoming border to 1 mile east of Wall; with US-85 from Spearfish to near Elkhorn Peak; with SD-34 from Whitewood to Sturgis; with SD-79 from Sturgis to Black Hawk; with SD-73 from Exit 143 to Kadoka; with SD-63 from Belvidere to Exit 170; with US-83 from Murdo to near Vivian; with SD-50 from southeast of Chamberlain to south of Pukwana; with SD-45 from Kimball to Exit 289

Lewis and Clark Trail: Chamberlain to Pukwana

History and Notes: Construction status of I-90:

  • Segments through Rapid City and from Wall to near Interior were under construction in 1960.
  • 1962: Segments open from Piedmont to Ellsworth AFB, New Underwood to northwest of Wasta; bypass of the Badlands; and US-77 to Minnesota border. Under construction from Ellsworth AFB to New Underwood; and Hartford to US-77.
  • 1971: Open from near Whitewood to Vivian, and Chamberlain to Minnesota border.
  • 1975: Only segment left to build was from the Wyoming border to Spearfish. Entire route completed by 1978.

Nathan Barton reports on some I-90 history, in reference to map clips on Map Page 2:

[The] section between Wall and Cactus Flats (east end of Badlands NP) was indeed completed as a 2-lane freeway and remained that way for about 10 years, as I recall. It was actually one of the first sections to be built to limited access standards in the mid-60s and was not changed to 4-lane until the mid-70s or later.

Attractions Along the Way: High Plains Heritage Center (Spearfish); Black Hills Passion Play (Sturgis); Sturgis Motorcycle Rally (Sturgis); Sturgis Motorcycle Museum (Sturgis); Reptile Gardens (Rapid City); Dinosaur Park (Rapid City); Museum of Geology (Rapid City); Black Hills Caverns (Rapid City); Air and Space Museum (Ellsworth Air Force Base); Wall Drug (Wall); Badlands National Park (Wall); National Grasslands Visitors Center (Wall); Badlands Petrified Gardens (Kadoka); 1880 Town (east of Belvidere); Pioneer Auto Museum (Murdo); Akta Lakota Museum (Chamberlain); South Dakota Hall of Fame (Chamberlain); South Dakota Tractor Museum (Kimball); Corn Palace (Mitchell); Enchanted World Doll Museum (Mitchell); USS South Dakota Memorial (Sioux Falls); Washington Pavilion of Arts and Sciences (Sioux Falls); Old Courthouse Museum (Sioux Falls); Great Plains Zoo and Delbridge Museum (Sioux Falls); Center for Western Studies (Sioux Falls); EROS Data Center (northeast of Sioux Falls)

Follow I-90 across: Washington, Idaho, Montana, Wyoming, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, and Massachusetts

Links: SDDOT's I-90 Corridor Study for the Sturgis to Piedmont section of I-90, AARoads I-90 Guide

BUSN I-90 Loop

New!

Alignment:

  • Segment 1: Spearfish -- I-90 Exit 10 to I-90 Exit 14, via old US-14. Multiplexed with US-85 for the northwest part, and ALT US-14 for the southeast part.
  • Segment 2: Sturgis -- I-90 Exit 30 to I-90 Exit 32, via old US-14. Multiplexed with SD-34 along the east-west segment, and with SD-79 along the north-south segment.
  • Segment 3: Rapid City -- I-90 Exit 51 to I-90 Exit 60, via an old alignment of US-14. Multiplexed with SD-79 through downtown, SD-44 through the middle of Rapid City, and Truck Bypass US-16 on the northeast side of town.
  • Segment 4: Wall -- I-90 Exit 109 to I-90 Exit 110, via an old alignment of US-14/US-16.
  • Segment 5: Kadoka -- I-90 Exit 150 to I-90 Exit 152, via an old alignment of US-16. Multiplexed for a short distance on the west end with SD-73.
  • Segment 6: Murdo -- I-90 Exit 191 to I-90 Exit 192, via an old alignment of US-16.
  • Segment 7: Vivian -- I-90 Exit 212 to I-90 Exit 214, via an old alignment of US-16. Multiplexed briefly with US-83.
  • Segment 8: Presho -- I-90 Exit 225 to I-90 Exit 226, via old US-16.
  • Segment 9: Oacoma/Chamberlain -- I-90 Exit 260 in Oacoma to I-90 Exit 265 southeast of Chamberlain, via an old alignment of US-16. Segment from Chamberlain southeast to I-90 is multiplexed with SD-50.
  • Segment 10: Plankinton -- I-90 Exit 308 to I-90 Exit 310, via an old US-16 alignment. Multiplexed with US-281 for north-south segment, and with unmarked SD-258 for the remainder.
  • Segment 11: Mitchell -- I-90 Exit 330 to I-90 Exit 332. East-west segment formerly part of US-16; multiplexed with SD-37 from near downtown southeast to Exit 330.

Links: Interstate Guide's Business I-90 Page and Business Route Photo Page

BUSN I-90 Spur

New!

Alignment:

  • Segment 1: Belvidere -- I-90 Exit 163, multiplexed with SD-63.
  • Segment 2: Sioux Falls -- I-90 Exit 399 (Cliff Ave.) to 10th/11th St (SD-42), multiplexed with SD-115.

History and Notes: Shield markers for this route in Sioux Falls use the word "Downtown" instead of "Business". The south end of the route is at a junction with Spur I-29 and Loop I-229.

Links: Interstate Guide's Business I-90 Page and Business Route Photo Page

BUSN I-90P Spur

New!

Alignment: White Lake to I-90 exit 296

Distance: 1 mile

History and Notes: An unmarked state route.