South Dakota Highway 21 (SD 21) is a

state highway A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either ''numbered'' or ''maintained'' by a sub-national state or province. A road numbered by a ...

in south-central

Hamlin County Hamlin County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 6,164. Its county seat is Hayti. The county was created in 1873 and organized in 1878. It was named for Hannibal Hamlin, Lincoln's first v ...

m South Dakota, that connects

Lake Norden Lake Norden is a city in Hamlin County, South Dakota, United States. It is part of the Watertown, South Dakota Micropolitan Statistical Area. The population was 554 at the 2020 census. Lake Norden was laid out in 1908, and named after a lake nea ...

and Hayti. SD 21 originally extended from the Nebraska state line to the North Dakota state line, completely concurrent with U.S. Route 81 (US 81). By the mid-1930s, only the current part of the highway remained.

Route description

SD 21 begins at an

intersection In mathematics, the intersection of two or more objects is another object consisting of everything that is contained in all of the objects simultaneously. For example, in Euclidean geometry, when two lines in a plane are not parallel, their i ...

with SD 28 just northwest of the main part of

. It travels to the north. Almost immediately, it crosses over Dolph Creek. It travels just west of Lake Norden. North of 192nd Street, it curves to the east. Approximately later, the highway curves to the north-northeast. Just south of 190th Street, it curves back to the north. Just south of 189th Street, it begins to parallel the eastern part of Lake Marsh. It then enters the southwestern part of Hayti. In the west-central part of the town, it turns right onto Main Avenue and heads to the east. Between 2nd and 3rd streets, it passes a U.S. post office and the Hayti Fire Hall. At an intersection with 4th Street, SD 21 turns left and heads north again. At this intersection is the Hamlin County Courthouse. At an intersection with Redbird Avenue, it turns right and heads to the east. East of 7th Street, it leaves Hayti and continues to the east until it reaches its eastern terminus, an intersection with US 81. Here, the roadway continues as 188th Street.

National Highway System

No part of SD 21 is included as part of the National Highway System, a system of routes determined to be the most important for the nation's economy, mobility and defense.

History

When SD 21 was established in 1926, it was completely concurrent with US 81, which was also established at this time. This concurrency extended from the Nebraska state line to the North Dakota state line. By 1935, all of SD 21 was decommissioned except for its current alignment.

Major intersections

References

External links