South Dakota Highway 73

Highway 73
Highway 73
	Route of SD 73 (in red)
Route information
	Maintained by SDDOT
Length	255.291 mi (410.851 km)
Existed	1926–present
Major junctions
South end	N-61 at the Nebraska border
	US 18 in Martin; I-90 in Kadoka; US 14 in Philip; US 212 in Faith; SD 20 near Bison; US 12 in Lemmon;
North end	ND 49 at Thunder Hawk
Location
Country	United States
State	South Dakota
Counties	Bennett, Jackson, Haakon, Ziebach, Meade, Perkins, Corson
Highway system
	South Dakota State Trunk Highway System; Interstate; US; State;

South Dakota Highway 73 (SD 73) is a state route that runs across western South Dakota. It begins at the Nebraska border, north of Merriman, Nebraska, as a continuation of Nebraska Highway 61. It runs to the North Dakota border, where it continues as North Dakota Highway 49. It is just more than 255 miles (410 km) in length.

History

When designated in the 1920s, South Dakota 73 only consisted of the segment from Faith (U.S. Route 212) to Lemmon (U.S. Route 12). The remainder of the route was unnumbered.

Around 1935, SD 73 was extended south from Faith, absorbing what had been a portion of South Dakota Highway 24 to near Plainview, then southeast via a new route to Philip. From there, it was concurrent with U.S. Highway 16 to Kadoka then southward along what had been South Dakota Highway 63. It continued south to the Nebraska border south of Martin, after sharing an alignment with U.S. Highway 18. Except for minor route straightening and a new concurrency with Interstate 90, this route has not changed since.

Around 1979, the northern terminus was extended east along U.S. 12 to Thunder Hawk, where it met up with a new road to link with ND 49.

Major intersections

County	Location	mi^[1]^[2]	km	Destinations	Notes
Cherry		0.000	0.000	N-61 south	Continuation into Nebraska
Bennett	Martin	12.580	20.246	US 18 west	Western end of US 18 concurrency
Bennett		24.646	39.664	US 18 east	Eastern end of US 18 concurrency
Jackson		50.339	81.013	SD 44
	Kadoka	69.951	112.575	SD 248
	Kadoka	70.310– 70.328	113.153– 113.182	I-90 east	Eastern end of I-90 concurrency
		76.616– 77.227	123.301– 124.285	I-90 west	Western end of I-90 concurrency
Haakon	Philip	92.047	148.135	US 14
Haakon		116.740	187.875	SD 34 east	Eastern end of SD 34 concurrency
Ziebach	No major junctions
Meade		145.523	234.197	SD 34 west	Western end of SD 34 concurrency
	Faith	173.638	279.443	US 212 east	Eastern end of US 212 concurrency
		176.801	284.534	US 212 west	Western end of US 212 concurrency
Perkins		206.704	332.658	SD 20 east	Southern end of SD 20 concurrency
		212.698	342.304	SD 20 west	Northern end of SD 20 concurrency
		240.858	387.623	US 12 west	Western end of US 12 concurrency
Corson		254.618	409.768	US 12 east	Eastern end of US 12 concurrency
Sioux		255.291	410.851	ND 49 north	Continuation into North Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus