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The final section of I-90 in the state opened in November 1976 between the Wyoming state line and Spearfish. [6] On May 24, 2012, the South Dakota Transportation Commission declared the entire length of I-90 as part of the National Purple Heart Trail, naming it the Purple Heart Memorial Highway, named after the military decoration of the same name.
Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington , and travels through the Pacific Northwest , Mountain West , Great Plains , Midwest , and the Northeast , ending in Boston , Massachusetts.
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 ...
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I-90/US 14 near Spearfish: US 14 near Elkton: 1925: current US 16: 69: 111 US 16 near Mount Rushmore: I-90/I-190/US 14 in Rapid City: 1925: current US 18: 451.88: 727.23 US 18 near Edgemont: US 18 near Canton: 1926: current US 77 — — — — 1929: 1982 US 81 — — US 81 at Yankton: I-29/US 81 near New Effington
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.
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Through South Dakota, the route runs 160 miles (257 km) from Rapid City to the North Dakota state line. [2] The route runs concurrent with Interstate 90/U.S. Route 14 from Rapid City at an interchange with Interstate 190/U.S. Route 16 west through Sturgis en route to Spearfish where it turns north onto U.S. 85.