South Dakota Highway 21

Highway 21
Route of SD 21 (in red)
Route information
Defined by SDCL §31-4-146
Maintained by SDDOT
Length:	9.465 mi (15.232 km)
Existed:	1926 – present
Major junctions
South end:	SD 28 in Lake Norden
North end:	US 81 east of Hayti
Location
Counties:	Hamlin
Highway system
South Dakota Highways ← x20px SD 20A SD 22 →

South Dakota Highway 21 (SD 21) is a short state route in east central South Dakota. The southwest end is located at the junction with South Dakota Highway 28 on the west edge of Lake Norden. After running northward to Hayti, it is routed east to end at the junction with U.S. Highway 81. It is 9.5 miles (15 kilometers) in length.

Route description

SD 21 begins at an intersections with SD 28 in the city of Lake Norden. From SD 28, it heads north past the western shores of Lake Norden. The highway makes a short jog to the east and then continues north towards Hayti. Through Hayti, the highway passes within feet of the eastern shore of Lake Marsh. At Redbird Street in Hayti, SD 21 turns to the east for the remainder of its route. It ends at U.S. Route 81 about 4 miles (6.4 km) east of Hayti.

History

The original South Dakota 21 was in place when the U.S. highway system was implemented in 1926. At that time, U.S. Highway 81 was assigned to the route of SD 21, and both numbers shared the road. When U.S. 81 in this area was rerouted a few miles east, SD 21 was kept on the old alignment, and has remained in place since.

Major intersections

The entire route is in Hamlin County.

Location	mi	km	Destinations	Notes
Lake Norden	0.000	0.000	SD 28 – Bryant, Estelline
​	9.465	15.232	US 81 – Watertown, Arlington
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

External links

• South Dakota Highways Page: Highways 1-30