Editing Interstate 90 (section)

===South Dakota===
{{Main|Interstate 90 in South Dakota}}
[[File:CHAMBERLAIN INTERSTATE BRIDGE.jpg|thumb|right|The [[Lewis and Clark Memorial Bridge]], which carries I-90 over the [[Missouri River]] near [[Chamberlain, South Dakota]]|alt=Distant view of a simple highway bridge crossing a wide river surrounded by rolling hills free of vegetation]]

I-90/US&nbsp;14 enters South Dakota near [[Spearfish, South Dakota|Spearfish]] and travels east through prairie land, where it is briefly concurrent with [[U.S. Route 85|US&nbsp;85]]. Beyond [[Sturgis, South Dakota|Sturgis]], the freeway turns south and follows the edge of the Black Hills to [[Rapid City, South Dakota|Rapid City]], the gateway to [[Mount Rushmore]].<ref>{{cite news |last=Henry |first=Neil |date=January 3, 1987 |title=Hush of the quiet season descends on the Black Hills |url=https://www.washingtonpost.com/archive/politics/1987/01/03/hush-of-the-quiet-season-descends-on-the-black-hills/00e14802-109a-4e1e-974e-90b2b5cc838e/ |newspaper=[[The Washington Post]] |accessdate=November 29, 2021}}</ref> It then skirts the northern edge of Rapid City, which is served by spur route [[Interstate 190 (South Dakota)|I-190]], and passes [[Ellsworth Air Force Base]] while it continues east across the plains. I-90 splits from US&nbsp;14 near [[Wall, South Dakota|Wall]], home to the [[Wall Drug]] roadside attraction and located northeast of [[Badlands National Park]].<ref>{{cite news |last=Gordon |first=Kindra |date=June 11, 2006 |title=Get away from it all |page=D1 |work=[[Rapid City Journal]] |url=https://www.newspapers.com/clip/89737914/get-away-from-it-all/ |via=Newspapers.com |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102613/https://www.newspapers.com/clip/89737914/get-away-from-it-all/ |url-status=live }}</ref><ref name="SD-Map">{{cite map |year=2019 |title=State Highway Map of South Dakota |scale=1 inch = approx. 15.43 miles |url=https://dot.sd.gov/media/documents/CADD-Mapping/State/SD-Map_medium.pdf |location=Pierre |publisher=[[South Dakota Department of Transportation]] |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232847/https://dot.sd.gov/media/documents/CADD-Mapping/State/SD-Map_medium.pdf |url-status=live }}</ref>

The freeway travels southeast into the [[Buffalo Gap National Grassland]] and also passes a pair of decommissioned [[missile silo]]s that form the [[Minuteman Missile National Historic Site]].<ref>{{cite map |year=2019 |title=Motor Vehicle Use Map: Buffalo Gap National Grassland, South Dakota |url=https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd701419.pdf |scale=Scale not given |location=Washington, D.C. |publisher=[[United States Forest Service]] |accessdate=November 29, 2021 |archive-date=November 29, 2021 |archive-url=https://web.archive.org/web/20211129102615/https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/fseprd701419.pdf |url-status=live }}</ref><ref>{{cite news |last=Bures |first=Frank |date=March 21, 2013 |title=Spring Travel Issue: Cold War-era tourist sites feature weapons of mass attraction |url=https://www.washingtonpost.com/blogs/liveblog/wp/2013/03/21/magazine-spring-travel-issue-cold-war-era-tourist-sites-feature-weapons-of-mass-attraction/ |newspaper=The Washington Post |accessdate=November 29, 2021}}</ref> I-90 continues east along the top of a plateau that faces the [[White River (Missouri River tributary)|White River]] and passes near [[Kadoka, South Dakota|Kadoka]] and [[Murdo, South Dakota|Murdo]]. [[U.S. Route 83|US&nbsp;83]] briefly joins the highway from Murdo to [[Vivian, South Dakota|Vivian]], where it splits off to serve the state capital of [[Pierre, South Dakota|Pierre]].<ref name="SD-Map"/> It then crosses the Missouri River on the [[Lewis and Clark Memorial Bridge]] near [[Chamberlain, South Dakota|Chamberlain]] and passes a [[rest area]] which overlooks the river and includes the {{convert|50|ft|m|adj=mid}} ''[[Dignity (statue)|Dignity]]'' statue.<ref name="KELO">{{cite news |date=June 15, 2021 |title=From cowboys to missiles: Places to stop this summer on your I-90 road trip |url=https://www.keloland.com/keloland-com-original/from-cowboys-to-missiles-places-to-stop-this-summer-on-your-i-90-road-trip/ |publisher=[[KELO-TV|Keloland.com]] |accessdate=November 29, 2021 |archive-date=October 9, 2022 |archive-url=https://web.archive.org/web/20221009232850/https://www.keloland.com/keloland-com-original/from-cowboys-to-missiles-places-to-stop-this-summer-on-your-i-90-road-trip/ |url-status=live }}</ref> From Chamberlain, I-90 continues east across the plains and past several small towns near the city of [[Mitchell, South Dakota|Mitchell]]. It then reaches the [[Sioux Falls, South Dakota|Sioux Falls]] area, where it bypasses the city to the north and intersects [[Interstate 29|I-29]] and [[Interstate 229 (South Dakota)|I-229]]. I-90 leaves Sioux Falls and crosses into [[Minnesota]] near [[Brandon, South Dakota|Brandon]].<ref name="SD-Map"/>