South Dakota Highway 40A
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| Highway 40A (Historic) |
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| Length: | 2 mi (3 km) | ||||||||
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| Formed: | 1970 | ||||||||
| Decomd.: | 1976 | ||||||||
| West end: |  Interior |
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| East end: | Alternate  Cedar Pass |
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South Dakota Highway 40A was a short spur route in the east part of Badlands National Park.
[edit] History
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.
