South Dakota Highway 45 is a state highway that runs north to south across much of central South Dakota, United States. The northern terminus is at the North Dakota border as a continuation of North Dakota Highway 3, and runs south to South Dakota Highway 44 at Platte. It is 198 miles (319 km) in length.

This article does not cite any sources. (October 2019)

Quick Facts Highway 45, Route information ...

Highway 45
Route of SD 45 (in red)
Route information
Maintained by SDDOT
Length	198 mi (319 km)
Existed	1927–present
Major junctions
South end	SD 44 / SD 50 in Platte
Major intersections	I-90 in Kimball US 14 in Miller US 212 near Faulkton US 12 in Ipswich
North end	ND 3 near Ashley
Location
Country	United States
State	South Dakota
Counties	Charles Mix Brule Buffalo Hand Faulk Edmunds McPherson
Highway system
South Dakota State Trunk Highway System Interstate US State
← SD 44 → SD 46

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SD 45 was established around 1927. The southern terminus was at the intersection of present-day SD 50 and County Road 49 (CR 49) and the northern terminus was at the intersection of SD 10 in Leola.

By 1932, it was extended south along what was part of SD 47 to Wheeler. By 1936, SD 45 was truncated at Kimball, at US 16, as US 281 supplanted the SD 45 designation to the south. In the early 1950s, when US 281 was relocated several miles to the east, SD 45 was extended back south to SD 50.

Around 1970, SD 50 had been realigned to intersect SD 44 west of Platte, and SD 45 was extended south along the old alignment to Platte, where it remains today.

The north end of the route has remained in its current configuration since 1936.

• List of state highways in South Dakota