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Map showing the interstates and primary highways in South Dakota. South Dakota has a total of 83,609 miles (134,556 km) of highways, roads, and streets, along with 679 miles (1,093 km) of interstate highways. [1] South Dakota and Montana are the only states sharing a land border which is not traversed by a paved road.
I-29 at the Iowa state line at Dakota Dunes: I-29 / US 81 at the North Dakota state line north-northwest of Victor: 1958: current I-90: 412.76: 664.27 I-90 at the Wyoming state line west-northwest of North Spearfish: I-90 at the Minnesota state line north-northeast of Valley Springs — — I-190: 1.72: 2.77 US 16 / SD 44 / West Boulevard in ...
current US 83 — — US 83 near Olsonville: US 83 near Herreid: 1925: current US 85 — — US 85 in the Black Hills region: US 85 near Ludlow: 1926: current US 85E — — — — 1931: 1937 US 183: 75.17: 120.97 US 183 near Wewela: I-90 near Presho: 1926: current US 212 — — US 212 near Belle Fourche: US 212 east of Watertown: 1925: current
current SD 18: 200: 320 Montana state line: Mobridge: 1926: c. 1935: Redesignated as South Dakota Highway 8: SD 19: 86.974: 139.971 N-15 at the Nebraska state line south of Vermillion: SD 34 southeast of Madison: 1926: current Designated as part of US 12: SD 19A: 8.161: 13.134 SD 19/SD 46 south of Centerville: SD 19 west of Centerville
South of the river, SD 44 enters Badlands National Park and bends to the east. The road continues east through the hills and plateaus of the Badlands, leaving Pennington County and entering Jackson County in the process. East of the county line, the highway bends to the northeast and enters Interior, where it meets the southern terminus of SD 377.
I-90 was constructed in the 1970s. The four-lane Interstate replaced old US 16 as the main road connecting Rapid City and Sioux Falls. Much of Old US 16 remains intact; however, I-90 has absorbed sections and likewise has reshaped the economies of many southern South Dakota towns. [4]
South Dakota Highway 11 (SD 11) is a 77.724-mile (125.085 km) state highway in eastern South Dakota, United States. It connects the northern part of the Sioux City metropolitan area with the Sioux Falls metropolitan area. The highway originally traveled on the current path of SD 115 in Sioux Falls and Dell Rapids, and ended north of Elkton.
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 Richland, where it continues as Iowa Highway 3. It is about 212 miles (341 km) in length.