South Dakota Highway 109

Highway 109
Highway 109
	Route of SD 109 (in red)
Route information
	Maintained by SDDOT
Length	12.167 mi (19.581 km)
Existed	1975–present
History	SD 15Y: 1962–1975
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;

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.

Route description

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.^[3]

History

SD 109 was originally designated Highway 15Y. It was renumbered to 109 in 1975.^[2]

Major intersections

County	Location	mi^[1]	km	Destinations
Grant	Big Stone City	0.000	0.000	US 12 – Milbank, Big Stone City
Roberts	Geneseo Township	12.167	19.581	SD 15 – Milbank, Hartford Beach, Wilmot
1.000 mi = 1.609 km; 1.000 km = 0.621 mi