South Dakota Highway 109
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Route of SD 109 (in red)
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| Route information | |
| Defined by SDCL §31-4-190 | |
| Maintained by SDDOT | |
| Length: | 12.167 mi (19.581 km) |
| Existed: | 1976 – present |
| History: | SD 15Y: 1962–1976 |
| Major junctions | |
| South end: |
 US 12 in Big Stone City
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| North end: |
 SD 15 in Geneseo Township
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| Location | |
| Counties: | Grant, Roberts |
| Highway system | |
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South Dakota Highway 109 (SD 109) is a short highway running along Big Stone Lake and the Minnesota border from South Dakota Highway 15 to U.S. Route 12 in Big Stone City. This highway was originally designated Highway 15Y. It was renumbered to 109 in 1976.
SD 109 begins at an intersection with US 12 in Big Stone City. It immediately crosses a bridge spanning railroad tracks and it heads northwest out of town. The highway follows the curvature of Big Stone Lake on the Minnesota River to the northwest and west for 12 miles (19 km). It ends at a 90-degree bend in SD 15 east of Hartford Beach State Park.
Route map: Google
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Wikipedia