South Dakota Highway 251
SD 251 highlighted in red | ||||
| Route information | ||||
| Maintained by SDDOT | ||||
| Length | 15.800 mi (25.428 km) | |||
| Major junctions | ||||
| South end | At the Nebraska border south of Gregory | |||
| North end | US 18 / SD 47 in Gregory | |||
| Location | ||||
| Country | United States | |||
| State | South Dakota | |||
| Counties | Gregory | |||
| Highway system | ||||
| ||||
| ||||
South Dakota Highway 251 (SD 251) is a state route in the U.S. state of South Dakota. SD 251's southern terminus is at the Nebraska border, and the northern terminus is at U.S. Route 18 (US 18) and SD 47 in Gregory. The entire speed limit outside of Gregory is 55 MPH, and serves a virtually unpopulated area of Gregory County.