South Dakota Highway 71
| Cascade Road | ||||
SD 71 highlighted in red | ||||
| Route information | ||||
| Maintained by SDDOT | ||||
| Length | 34.535 mi (55.579 km) | |||
| Existed | 1962–present | |||
| Major junctions | ||||
| South end | N-2 / N-71 northwest of Crawford, NE | |||
| North end | US 18 Byp. in Hot Springs | |||
| Location | ||||
| Country | United States | |||
| State | South Dakota | |||
| Counties | Fall River | |||
| Highway system | ||||
| ||||
| ||||
South Dakota Highway 71 (SD 71) is a 34.535-mile (55.579 km) state highway in Fall River County, South Dakota, United States, that travels from the Nebraska state line (where it continues as N-2/N-71 through the Black Hills National Forest) to U.S. Route 18 Bypass (US 18 Byp.) in Hot Springs. It is part of a triple state highway serving South Dakota, Nebraska, and Colorado.