South Dakota Highway 45
Route of SD 45 (in red)
|Maintained by SDDOT|
|Length:||198 mi (319 km)|
|Existed:||1927 – present|
|South end:||SD 44 / SD 50 in Platte|
|North end:||ND 3 near Ashley|
|Counties:||Charles Mix, Brule, Buffalo, Hand, Faulk, Edmunds, McPherson|
South Dakota Highway 45 is a state route that runs north to south across much of central South Dakota. 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.
South Dakota 45 was established around 1927. The northern end was at the intersection of South Dakota Highway 10 in Leola, and the southern end was at the intersection of present-day South Dakota Highway 50 and Charles Mix County Road 49.
By 1932, it was extended south along what was part of South Dakota Highway 47 to Wheeler. By 1936, SD 45 was truncated at Kimball (U.S. Highway 16), as U.S. Highway 281 supplanted the SD 45 designation to the south. In the early 1950s, when US 281 was relocated several miles east, SD 45 was extended back south to SD 50.
The north end of the route has remained in its current configuration since 1936.
|Charles Mix||Platte||SD 44 / SD 50 – Winner|
|Brule||I‑90 east – Mitchell||East end of I-90 concurrency|
|Kimball||I‑90 west – Rapid City||West end of I-90 concurrency|
|Buffalo||SD 34 – Wessington Springs|
|Hand||Miller||US 14 east – St. Lawrence||South end of US 14 concurrency|
|US 14 west – Pierre||North end of US 14 concurrency|
|SD 26 east||South end of SD 26 concurrency|
|SD 26 west||North end of SD 26 concurrency|
|US 212 east – Redfield||South end of US 212 concurrency|
|Faulk||US 212 west – Faulkton||North end of US 212 concurrency|
|SD 20 east – Northville||South end of SD 20 concurrency|
|SD 20 west – Onaka||North end of SD 20 concurrency|
|Edmunds||Ipswich||US 12 west – Roscoe||West end of US 12 concurrency|
|US 12 east – Aberdeen||East end of US 12 concurrency|
|McPherson||Leola||SD 10 east – Britton||East end of SD 10 concurrency|
|SD 239 north – Long Lake|
|SD 10 west / SD 247 south||West end of SD 10 concurrency|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi