South Dakota Highway 42
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Route of SD 42 (in red)
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| Route information | |
| Defined by SDCL §31-4-162 | |
| Maintained by SDDOT | |
| Length: | 71.973 mi (115.829 km) |
| Western segment | |
| Length: | 5.870 mi (9.447 km) |
| West end: |
 US 281 in Aurora County
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| East end: | Aurora–Davison county line |
| Central segment | |
| Length: | 59.231 mi (95.323 km) |
| West end: |
 SD 37 west of Ethan
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| Major junctions: |
 US 81 in McCook County
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| East end: | Sioux Falls |
| Eastern segment | |
| Length: | 6.872 mi (11.059 km) |
| West end: |
 SD 11 in Sioux Falls
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| East end: |
 Iowa 9 west of Benclare
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| Location | |
| Counties: | Aurora, Davison, Hanson, McCook, Minnehaha |
| Highway system | |
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South Dakota Highway 42 (SD 42) is a segmented state highway in southeastern South Dakota. The first segment is a six-mile-long (9.7 km) highway in Aurora County. The second and longest is 60 miles (97 km) long and connects Ethan and Sioux Falls. The final segment connects Sioux Falls to Iowa Highway 9 southeast of Rowena.
The westernmost segment of SD 42 begins at a junction with U.S. Route 281 (US 281) and travels east through open farmland. This is the shortest of the three segments; it is only about six miles (9.7 km) long, and it ends as the roadway crosses from Aurora County into Davison County.
The central segment of the highway begins at an intersection with SD 37 in rural Davison County. It heads east and crosses the BNSF Railway. Just east of the railroad, the route passes through the town of Ethan, then enters Hanson County. About six miles (9.7 km) farther east, SD 42 bends slightly to the south and crosses the James River. The highway continues east through the flat prairie and enters McCook County.
About five miles (8.0 km) east of the county line, the highway enters the city of Bridgewater. Here, it curves to the northeast and crosses another branch of the BNSF Railway before meeting the eastern terminus of SD 262. SD 42 then curves back to the east and leaves Bridgewater. It continues through flat farmland, intersecting US 81 and passing over the west fork of the Vermillion River. The route heads east about ten miles (16 km) before crossing the east fork of the Vermillion River, and then entering Minnehaha County.
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