| Highway 40 | ||||
|---|---|---|---|---|
Route of SD 40 (in red) |
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| Route information | ||||
| Defined by SDCL §31-4-161 | ||||
| Maintained by SDDOT | ||||
| Length: | 37 mi (59.5 km) | |||
| Existed: | 1976 – present | |||
| Major junctions | ||||
| West end: | US 16A in Keystone | |||
| SD 79 in Hermosa | ||||
| East end: | Bureau of Indian Affairs Highway 41 in Red Shirt | |||
| Location | ||||
| Counties: | Pennington, Custer, Shannon | |||
| Highway system | ||||
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South Dakota numbered highways
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South Dakota Highway 40 is a state highway in southwest South Dakota. The highway is 37 miles (60 km) long and runs from U.S. Route 16A in Keystone to Bureau of Indian Affairs Highway 41 in Red Shirt. The highway runs near Mount Rushmore National Memorial in Keystone, and its eastern terminus is on the Pine Ridge Indian Reservation near the edge of Badlands National Park. SD 40 was established along its current route in 1976; the SD 40 designation was originally used on a highway that is now part of South Dakota Highway 44.
| Highway 40A | |
|---|---|
| Location: | Badlands National Park |
| Length: | 2 mi (3 km) |
| Existed: | 1970–1976 |
South Dakota Highway 40A was a short spur route in the east part of Badlands National Park. This route was originally part of South Dakota Highway 40. At that time, SD 40 exited the park to the northeast, and continued east with U.S. Highway 16. Around 1970, SD 40 was rerouted south from the park to a new alignment south of the White River. When this was done, SD 40A was created to link with Alternate U.S. Highway 16.
In 1976, this route was redesignated as South Dakota Highway 377.
The route of SD 40 is defined in South Dakota Codified Laws § 31-4-161. [1]