South Dakota Highway 89
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Route of SD 89 (in red)
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| Route information | |
| Defined by SDCL §31-4-183 | |
| Maintained by SDDOT | |
| Length: | 34.5 mi (55.5 km) |
| Existed: | 1950 – present |
| Major junctions | |
| South end: |
 US 18 near Minnekahta
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 US 385 in Pringle US 16A in Custer
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| North end: |
 SD 87 in Custer State Park
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| Highway system | |
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South Dakota Highway 89 (SD 89) is a state highway in southwest South Dakota. The highway is 40 miles (64 km) long and runs from U.S. Route 18 near Minnekahta to South Dakota Highway 87 in Custer State Park. SD 89 is co-signed with U.S. Route 385 from Pringle to Custer. The portion of the highway from Custer to SD 87 is part of the Peter Norbeck Scenic Byway.
SD 89 was established in 1950 from Spearfish to Minnekahta. The section from Spearfish to SD 87 was changed to U.S. Route 14 Alternate and U.S. Forest Service roads. The section of SD 89 from Custer to Sylvan Lake was once part of an alternate route of U.S. Route 85.
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