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Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States.The population was 240 at the 2020 census. [5] It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to the Mount Rushmore National Memorial, which is located just beyond the town limits.
It splits from US 16 in the Black Hills of the southwestern part of the U.S. state of South Dakota. The highway's western terminus is an intersection with US 16, US 385, and South Dakota Highway 89 (SD 89) in Custer. The eastern terminus is at an interchange with US 16 called Keystone Wye south of Rapid City.
This is a list of places incorporated in the U.S. state of South Dakota as cities. Municipalities in South Dakota can also be incorporated as towns. South Dakota has one incorporated village, Wentworth, Lake County. [1] There are 310 municipalities.
South Dakota also contains numerous state parks, all of which are managed by the South Dakota Department of Game, Fish, and Parks. Custer State Park in the Black Hills is a large state park with over 71,000 acres, and includes Sylvan Lake , Needles Highway , and a wildlife loop featuring a large bison herd and the "begging burros", [ 65 ] among ...
South Dakota Highway 40A (SD 40A) was a short spur route in the east part of Badlands National Park. This route was originally part of SD 40. At that time, SD 40 exited the park to the northeast, and continued east with US 16. Around 1970, SD 40 was rerouted south from the park to a new alignment south of the White River.
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Pennington County, South Dakota, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.
South Dakota Highway 244 (SD 244) is a short state highway located entirely within Pennington County, South Dakota which provides access to Mount Rushmore. Highway 244 runs generally east–west between its eastern terminus at US 16A near Keystone and its western terminus at US 16 / US 385 south of Hill City .
The Keystone Wye is a three-level Directional T interchange for the two divided highways, constructed in 1967–1968 as part of a project by the South Dakota Department of Transportation (SDDOT) to convert US 16 to a four-lane highway between Rapid City and Keystone. It was designed by Clyde Jundt and Kenneth C. Wilson.