Constitutional Route 9 (Minnesota)
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U.S. Highway 16 (US 16) is an east–west
United States Numbered Highway The United States Numbered Highway System (often called U.S. Routes or U.S. Highways) is an integrated network of roads and highways numbered within a nationwide grid in the contiguous United States. As the designation and numbering of these h ...
between
Rapid City, South Dakota Rapid City is the county seat of Pennington County, South Dakota, United States. It is located on the eastern slope of the Black Hills in western South Dakota and was named after Rapid Creek (South Dakota), Rapid Creek, where the settlement deve ...
, and
Yellowstone National Park Yellowstone National Park is a List of national parks of the United States, national park of the United States located in the northwest corner of Wyoming, with small portions extending into Montana and Idaho. It was established by the 42nd U ...
in
Wyoming Wyoming ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States, Western United States. It borders Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho t ...
. The highway's eastern terminus is at a junction with
Interstate 90 Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mou ...
(I-90)/ US 14,
concurrent Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to: Law * Concurrence, in jurisprudence, the need to prove both ''actus reus'' and ''mens rea'' * Concurring opinion (also called a "concurrence"), a ...
with I-190, in Rapid City. The western terminus is the east entrance to Yellowstone National Park, concurrent with US 14 and US 20. US 16 used to extend all the way to
Michigan Michigan ( ) is a peninsular U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, ...
but has been truncated in favor of I-90 and
I-96 Interstate 96 (I-96) is an east–west Interstate Highway that runs for approximately entirely within the Lower Peninsula of the US state of Michigan. The western terminus is at an interchange with US Highway 31 (US 31) and B ...
.


Route description

, - , , , - , , , - , Total ,


Wyoming

US 16 begins at the east entrance to
Yellowstone National Park Yellowstone National Park is a List of national parks of the United States, national park of the United States located in the northwest corner of Wyoming, with small portions extending into Montana and Idaho. It was established by the 42nd U ...
, along with US 14 and the eastern segment of US 20. From the park, the three highways run concurrently to Cody and Greybull. In Greybull, US 14 splits off to the east, while US 16/US 20 heads due south to Basin and Worland. In Worland, US 16 splits off from US 20 and heads east over Powder River Pass on its way to the city of
Buffalo Buffalo most commonly refers to: * True buffalo or Bubalina, a subtribe of wild cattle, including most "Old World" buffalo, such as water buffalo * Bison, a genus of wild cattle, including the American buffalo * Buffalo, New York, a city in the n ...
. After passing Buffalo, US 16 arches north to the community of Ucross, meeting US 14 again, before arching back south to
Gillette Gillette is an American brand of safety razors and other personal care products including shaving supplies, owned by the multi-national corporation Procter & Gamble (P&G). Based in Boston, Massachusetts, United States, it was owned by The Gil ...
. US 16 then runs east concurrently with
I-90 Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mountain West, Great Pla ...
between Gillette and
Moorcroft W. Moorcroft Limited (trading as W Moorcroft Ltd) is a British art pottery manufacturer specialising in richly decorated earthenware, based at Burslem in Stoke-on-Trent, England. The company was founded in 1913 by William Moorcroft. In 2025 ...
before heading southeast to the towns of Upton and
Newcastle Newcastle usually refers to: *Newcastle upon Tyne, a city and metropolitan borough in Tyne and Wear, England, United Kingdom *Newcastle-under-Lyme, a town in Staffordshire, England, United Kingdom *Newcastle, New South Wales, a metropolitan area ...
. The highway then heads east to the South Dakota state line. For most of the way through the state, the highway is a two-lane road.


South Dakota

US 16 is also known as Mount Rushmore Road in western South Dakota. From the state line, the highway travels near
Jewel Cave Jewel Cave National Monument contains Jewel Cave, currently the fifth longest cave in the world and second longest cave in the United States, with of mapped passageways as of May 2024. It is located approximately west of the town of Custer in ...
, the third-longest cave in the world. The highway goes through the city of
Custer George Armstrong Custer (December 5, 1839 – June 25, 1876) was a United States Army officer and cavalry commander in the American Civil War and the American Indian Wars. Custer graduated from the United States Military Academy at West Point ...
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 a half-mile () in some places, including the old gold-mining town of Rockerville, which is contained entirely between the two roadways. In Rapid City, a truck bypass runs along Catron Boulevard and Elk Vale Road up to exit 61 on
I-90 Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mountain West, Great Pla ...
. The South Dakota section of US 16 is defined at South Dakota Codified Laws § 31-4-138.


History

US 16 originally connected
Detroit Detroit ( , ) is the List of municipalities in Michigan, most populous city in the U.S. state of Michigan. It is situated on the bank of the Detroit River across from Windsor, Ontario. It had a population of 639,111 at the 2020 United State ...
with Yellowstone National Park, including a ferry link across
Lake Michigan Lake Michigan ( ) is one of the five Great Lakes of North America. It is the second-largest of the Great Lakes by volume () and depth () after Lake Superior and the third-largest by surface area (), after Lake Superior and Lake Huron. To the ...
between
Muskegon, Michigan Muskegon ( ) is a city in and the county seat of Muskegon County, Michigan, United States. Situated around a harbor of Lake Michigan, Muskegon is known for fishing, sailing regattas, and boating. It is the most populous city along Lake Michigan' ...
, and
Milwaukee, Wisconsin Milwaukee is the List of cities in Wisconsin, most populous city in the U.S. state of Wisconsin. Located on the western shore of Lake Michigan, it is the List of United States cities by population, 31st-most populous city in the United States ...
. In Michigan, the route was in use long before automobiles and was known to white settlers as the Grand River Road, and prior to the designation of U.S. Highways in 1926, had been designated as M-16 in the 1920s from Detroit to south of Muskegon. In 1938, reflectorized discs were placed on US 16 every from Detroit to
Lansing Lansing () is the capital city of the U.S. state of Michigan. The most populous city in Ingham County, parts of the city extend into Eaton County and north into Clinton County. It is the sixth-most populous city in Michigan with a popul ...
, resulting in fewer nighttime traffic accidents. Other states would later do the same on their roads. US 16 initially crossed the
South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state, state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Dakota people, Dakota Sioux ...
Wyoming Wyoming ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States, Western United States. It borders Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho t ...
state line west of
Spearfish Spearfish may refer to: Places * Spearfish, South Dakota, United States * North Spearfish, South Dakota, United States * Spearfish Formation, a geologic formation in the United States Biology * ''Tetrapturus'', a genus of marlin with shorter ...
. U.S. Highway 216 (US 216) was commissioned in 1930 as a loop off US 16 to the south between
Rapid City Rapid City is the county seat of Pennington County, South Dakota, United States. It is located on the eastern slope of the Black Hills in western South Dakota and was named after Rapid Creek, where the settlement developed. It is the second-mo ...
and
Moorcroft W. Moorcroft Limited (trading as W Moorcroft Ltd) is a British art pottery manufacturer specialising in richly decorated earthenware, based at Burslem in Stoke-on-Trent, England. The company was founded in 1913 by William Moorcroft. In 2025 ...
, crossing the state line west of
Custer George Armstrong Custer (December 5, 1839 – June 25, 1876) was a United States Army officer and cavalry commander in the American Civil War and the American Indian Wars. Custer graduated from the United States Military Academy at West Point ...
. In 1934, US 16 was moved to the US 216 alignment, while the former US 16 became part of an extension of US 14. In Michigan, most of US 16 was superseded by
I-96 Interstate 96 (I-96) is an east–west Interstate Highway that runs for approximately entirely within the Lower Peninsula of the US state of Michigan. The western terminus is at an interchange with US Highway 31 (US 31) and B ...
and a segment of Grand River Avenue in Detroit ultimately became M-5. US 16 was later decommissioned in
Wisconsin Wisconsin ( ) is a U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest of the United States. It borders Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michig ...
,
Minnesota Minnesota ( ) is a U.S. state, state in the Upper Midwestern region of the United States. It is bordered by the Canadian provinces of Manitoba and Ontario to the north and east and by the U.S. states of Wisconsin to the east, Iowa to the so ...
, and eastern South Dakota to its present termini. Between Rapid City and
Dexter, Minnesota Dexter is a city in Mower County, Minnesota, United States. The population was 324 at the 2020 census. History Dexter was platted in 1874 and named for Dexter Parrit, an early settler. A post office has been in operation at Dexter since 1 ...
, it has been supplanted by I-90. In
Faribault County, Minnesota Faribault County ( ) is a county in the U.S. state of Minnesota. As of the 2020 census, the population was 13,921. Its county seat is Blue Earth. History The county was founded in 1855. It was named for Jean-Baptiste Faribault, a settler a ...
, the highway took on another number as there was already a county highway numbered 16. Residents of the county continued referring to the road as "16" or "old 16" and eventually the county renumbered it as County Road 16 (CR 16). From the county's western border with Martin County, US 16 continued east through the city of Blue Earth as part of 1st Street and Leland Parkway until it briefly combines with US 169/Grove Street. south of that point at the intersection of Grove and 7th streets, CR 16 followed 7th Street and continued east to the border of
Freeborn County Freeborn County is a County (United States), county in the U.S. state, state of Minnesota. As of the 2020 United States census, 2020 census, the population was 30,895. Its county seat is Albert Lea, Minnesota, Albert Lea. Freeborn County compri ...
. Most of the stretch through Faribault County was a relatively narrow two-lane highway with wide gravel shoulders that has been widened at least two times since US 16 was decommissioned. East of Dexter, it is now Minnesota State Highway 16 and State Trunk Highway 16 in Wisconsin. In South Dakota, it was replaced by various state highways (including South Dakota Highway 38, or SD 38, and SD 248) and county roads: generally, in West River, the old alignment was transferred to county responsibility entirely, while, in
East River The East River is a saltwater Estuary, tidal estuary or strait in New York City. The waterway, which is not a river despite its name, connects Upper New York Bay on its south end to Long Island Sound on its north end. It separates Long Island, ...
, it remained a state-maintained highway. An older US 16A in South Dakota has become SD 240. In South Dakota in 2009, the
South Dakota Department of Transportation The South Dakota Department of Transportation (SDDOT) is a state government organization in charge of maintaining public roadways of the U.S. state of South Dakota. South Dakota has 82,447 miles of highways, roads and streets, as well as 5,905 ...
designated US 16/ US 385 between Custer and Hill City, which passes by the
Crazy Horse Memorial The Crazy Horse Memorial is a mountain monument under construction on privately held land in the Black Hills, in Custer County, South Dakota, United States. It will depict the Oglala Lakota warrior Crazy Horse, riding a horse and pointing to his ...
, now being carved in the
Black Hills The Black Hills is an isolated mountain range rising from the Great Plains of North America in western South Dakota and extending into Wyoming, United States. Black Elk Peak, which rises to , is the range's highest summit. The name of the range ...
, as the Crazy Horse Memorial Highway. This segment of US 385 is also a part of the
George Hearst George Hearst (September 3, 1820 – February 28, 1891) was an American businessman, politician, and patriarch of the Hearst family, Hearst business dynasty. After growing up on a small farm in Missouri, he founded many mining operations a ...
Memorial Highway.


Major intersections

Mileage resets at the state line crossing.


See also


Related routes

* ''
U.S. Route 116 U.S. Route 14 or U.S. Highway 14 (US 14), an east–west route, is one of the original United States Numbered Highways of 1926. It is about long. It is roughly parallel to Interstate 90 (I-90). The highway's eastern termin ...
'' * '' U.S. Route 216''


Special and suffixed routes

* U.S. Route 16A in
South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state, state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Dakota people, Dakota Sioux ...
* Special routes of U.S. Route 16


References


External links


Endpoints of US 16Highways and Gas Stations- US Hwy 16 Page 1937 South Dakota Transportation Map 1930 Minnesota Transportation Map 1937 Wisconsin Transportation Map
{{Authority control 16 16 16 Transportation in Park County, Wyoming Transportation in Big Horn County, Wyoming Transportation in Washakie County, Wyoming Transportation in Johnson County, Wyoming Transportation in Campbell County, Wyoming Transportation in Crook County, Wyoming Transportation in Weston County, Wyoming Transportation in Custer County, South Dakota Transportation in Pennington County, South Dakota