South Dakota Highway 109

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Highway 109
Route of SD 109 (in red)
Route information
Maintained by SDDOT
Length	12.167 mi[1] (19.581 km)
Existed	1975[2]–present
History	SD 15Y: 1962–1975[2]
Major junctions
South end	US 12 in Big Stone City
North end	SD 15 in Geneseo Township
Location
Country	United States
State	South Dakota
Counties	Grant, Roberts
Highway system
South Dakota State Trunk Highway System Interstate US State
← SD 106 → SD 115

South Dakota Highway 109 (SD 109) is a 12.167-mile (19.581 km) state highway in Grant and Roberts counties in South Dakota, United States, runs along the south side of Big Stone Lake and the Minnesota border from U.S. Route 12 in Big Stone City to South Dakota Highway 15.