South Dakota Highway 46
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Route of SD 46 (in red)
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| Route information | |
| Defined by SDCL §31-4-166 | |
| Maintained by SDDOT | |
| Length: | 105.535 mi (169.842 km) |
| Existed: | 1936 – present |
| Major junctions | |
| West end: |
  US 18 / US 281 in Pickstown
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 I-29 in Beresford
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| East end: |
 Iowa 10 at Iowa state line |
| Location | |
| Counties: | Charles Mix, Bon Homme, Yankton County, Clay, Turner, Lincoln, Union |
| Highway system | |
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South Dakota Highway 46 is a state route that runs west to east across southeastern South Dakota. It begins at the junction of U.S. Highway 18 and U.S. Highway 281 in Pickstown, and runs due east to nearly the Iowa border, before curving south to cross the border and meeting Iowa Highway 10. It is 107 miles (172 kilometers) in length.
South Dakota 46 was established around 1935. Its initial alignment only extended west to U.S. Highway 81. The extension further west occurred around 1960.
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