South Dakota Highway 37

South Dakota 37 was in place by 1926, and largely has used the same alignment since. The only significant exception was in northeast South Dakota, where SD 37 originally went westward from Groton to Bath, then north via Columbia to Houghton, where it continued to Hecla. This segment was rerouted to the current alignment by 1929.

On the south end, the road ended at the Missouri River at Running Water. A seasonal ferry was in place to carry traffic across the river. A direct connection via bridge did not open until 1998 when the Chief Standing Bear Memorial Bridge was completed.

In the early and mid-1930s, the segment between Huron and Tripp was co-numbered as U.S. Route 281. This concurrency was dropped by 1936, when US 281 was realigned further west.

The segment between Huron and Mitchell was upgraded to a 4-lane expressway, and was largely completed by 2004. A minor rerouting around the west end of Mitchell occurred, resulting in a 2-mile (3.2 km) concurrency with Interstate 90.

The route of SD 37 is defined in South Dakota Codified Laws § 31-4-158.[1]

South Dakota Highway 37A (SD 37A) is a north–south state highway in the U.S. state of South Dakota. SD 37A's southern terminus is at SD 37 in Tripp, and the northern terminus is at US 18 north of Tripp.

The entire route is in Hutchinson County.

Location	mi	km	Destinations	Notes
Tripp	0.000	0.000	SD 37	Southern terminus
​			US 18	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

• List of state highways in South Dakota

Wikimedia Commons has media related to South Dakota Highway 37.

• South Dakota Highways Page: Highways 31-60