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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]
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.
In Rapid City, US 16 follows Mount Rushmore Road to a concurrency with South Dakota Highway 44 (SD 44; Omaha Street) to the southern terminus of I-190. US 16 stays concurrent with I-190 until both highways end at I-90. This section of US 16 is defined at South Dakota Codified Laws § 31-4-138. [3]
Also located in the state are the shorter interstates 190, a spur into central Rapid City, and 229, a loop around eastern and southern Sioux Falls. The length of South Dakota's portion of I-29 is 252 miles (406 km). [2] Larger cities served by the route include Watertown, Brookings, Sioux Falls, and Vermillion. [2]
U.S. Highway 16 (US 16) is an east–west United States Numbered Highway between Rapid City, South Dakota, and Yellowstone National Park in Wyoming.The highway's eastern terminus is at a junction with Interstate 90 (I-90)/US 14, concurrent with I-190, in Rapid City.
I-190 / US 16 in Rapid City; US 212 in Newell; SD 20 in Reva; ... South Dakota Highway 79 (SD 79) is a 209-mile (336 km) state highway in western South Dakota, ...
South Dakota Highway 44 (SD 44) is a state highway in southern South Dakota that runs from U.S. Route 385 (US 385) west of Rapid City to Interstate 29 (I-29) south of Sioux Falls. It is just more than 379 miles (610 km) long.
Interstate 190 (I-190) is an auxiliary Interstate Highway in the US state of South Dakota. The route runs for about two miles (3.2 km) connecting I-90 to downtown Rapid City. The entire route is concurrent with US Highway 16 (US 16).