US 16 is also known as Mount Rushmore Road in western South Dakota. The highway enters South Dakota east of Newcastle, Wyoming. It travels near Jewel Cave, the third-longest cave inthe world. The highway goes through the city of Custer and shares alignment with US 385. East of Hill City, US 16 splits off US 385. It then becomes a four-lane divided highway, with the two roadways separated by up to in some places, including the old gold-mining town of Rockerville, South Dakota, which is contained entirely in the median of US 16. In Rapid City, US 16 follows Mount Rushmore Road to a concurrency with SD 44 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.
History
US 16 formerly ran all the way across the state, to the Minnesota state line east of Sioux Falls. It entered the state on the current routing of US 14/I-90, and followed the US 14 routing to Rapid City. It joined U.S. Route 216 in Rapid City, and continued east into Box Elder. "Highway 14-16," as it was known, was a divided highway through most of Box Elder before returning to a two-lane road. US 16 traveled east to New Underwood, then continued through the foothills to Wasta. The highway ran north of Wasta, across the Cheyenne River, then ran southeast to Wall. In Wall, an alternate route of US 16 split from the highway and headed south, through the Badlands National Monument. US 14 and US 16 split south of Philip, with US 14 travelling due east and US 16 continuing south, 251st Street to Kimball, and 252nd Street to White Lake. US 16 then followed present-day County Road 34 to Mount Vernon and present-day 254th Street to Mitchell. It then followed what is now SD 38 east to 421st Avenue, 421st Avenue to Alexandria, SD 262 to Bridgewater, and SD 42 to Sioux Falls.The highway followed Minnesota Avenue, 6th Street, Sycaomre Avenue, Madison Street, and Splitrock Boulevard to Brandon. It then followed present-day Aspen Boulevard from Brandon east to the Minnesota state line north of Valley Springs.
Major intersections
Related routes
Special routes of US 16 in South Dakota consist of an alternate route that runs from Custer to near Keystone as well as truck routes in Hill City and Rapid City, and formerly included a business route in Rapid City and an alternate route between Wall and Kadoka.
South Dakota Highway 248 is a state highway in the U.S. state of South Dakota. The highway travels parallel to Interstate 90 less than away from it. It travels through Lyman, Jones, and Jackson counties starting near the entrance to Badlands National Park at an intersection with SD 240 and terminating at exit 248 of I-90 east of Reliance. SD 248 is a former routing of US 16.
