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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.
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. When this was done, SD 40A was created to link with US 16A. In 1976, this route was redesignated as South Dakota Highway 377.
It reached Keystone on January 20, 1900 and was later used to haul equipment for carving nearby Mount Rushmore. [ 2 ] The Black Hills Central Railroad restores early twentieth century-era locomotives and train cars and has been featured on television shows such as the Gunsmoke episode "Snow Train", General Hospital and the TNT mini-series Into ...
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.
Map of the United States with South Dakota highlighted Sioux Falls, most populous city in South Dakota Rapid City, ... Keystone: 241 240 +0.42%: Pennington:
The Keystone School, on 3rd St. in Keystone, South Dakota, was listed on the National Register of Historic Places in 1981. It is a large rural school built 1897-1900 by Eli Shomaker, with roof of wood shingles. [2] In 2018, it has been the Keystone Historical Museum for a number of years. [3]
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Western end of SD 73 concurrency: Kadoka: 150.20: 241.72: 150: I-90 BL east / SD 73 south – Kadoka: Eastern end of SD 73 concurrency: 152.42: 245.30: 152: I-90 BL west (South Creek Road) – Kadoka: Belvidere: 163.03: 262.37: 163: SD 63 south – Belvidere: Western end of SD 63 concurrency: Northeast Jackson: 170.31: 274.09: 170: SD 63 north ...