South Dakota Highway 25

Highway 25
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Route information
	Defined by SDCL §31-4-148
	Maintained by SDDOT
Length:	201.259 mi (323.895 km)
Existed:	c. 1926 – present
Major junctions
South end:	SD 50 northwest of Tabor
North end:	ND 18 north of Claire City
Location
Counties:	Bon Homme, Hutchinson, Hanson, Miner, Kingsbury, Clark, Day, Marshall, Roberts
Highway system

South Dakota Highway 25 is a state route that runs north to south across a large portion of South Dakota. It is divided into two segments. The main segment begins at the North Dakota border, with the junction of North Dakota Highway 18 north of Claire City. Its southern terminus is at the junction of South Dakota Highway 42 south of Emery. This segment is 191 miles (307 km) long. The second segment begins at a junction with U.S. Highway 18 west of Olivet, and extends south to South Dakota Highway 50 northwest of Tabor. It is 22 miles (35 km) in length. The total length of SD 25 is just over 201 miles (323 km) in length.

History

When first designated in 1926, the south terminus of South Dakota 25 was at Howard. The segment from north of South Dakota Highway 262 (U.S. Highway 16 at the time) to Howard was gradually added in the 1970s as construction was completed. The segment between SD 42 and SD 262 was added around 1992.

On the north end, SD 25 in 1926 took a zig-zag route north from De Smet; it went through Clark to Webster then west about 15 miles (24 km) before heading north to Britton and the North Dakota line northeast of Kidder.

In the mid 1950s, the route was realigned so it went straight north from De Smet to U.S. Highway 212 east of Clark, then north to Webster, before resuming the previous alignment to North Dakota.

In 1976, the north portion of SD 25 was shifted east to absorb an old alignment of South Dakota Highway 23 Webster to Lake City; it then curved northeast through Veblen and north again at Hammer, on a former alignment of South Dakota Highway 15.

Also in 1976, the distinct southern segment was added, absorbing the old South Dakota Highway 35.

Major intersections

County	Location	mi^[1]^[2]	km	Destinations	Notes
Bon Homme		0.000	0.000	SD 50	Southern terminus
Bon Homme		8.499	13.678	SD 46
Hutchinson		19.519	31.413	US 18
Gap in route
Hanson		19.519	31.413	SD 262
		22.894– 23.003	36.844– 37.020	I-90 – Mitchell, Sioux Falls	I-90 exit 350
		25.520	41.070	SD 38
Miner		46.658	75.089	SD 34 west	Western end of SD 34 concurrency
Miner		52.702	84.816	SD 34 east	Eastern end of SD 34 concurrency
Kingsbury	De Smet	74.594	120.047	US 14
Clark		88.709	142.763	SD 28	Southern end of SD 28 concurrency
		91.699	147.575	SD 28 west	Northern end of SD 28 concurrency
		108.755	175.024	US 212 west	Western end of US 212 concurrency
		109.625	176.424	US 212	Eastern end of US 212 concurrency
		124.674	200.643	SD 20
Day	Webster	142.057	228.619	US 12
Marshall	Lake City	172.054	276.894	SD 10 west	Western end of SD 10 concurrency
Marshall		172.894	278.246	SD 10 east	Eastern end of SD 10 concurrency
Roberts		196.228	315.798	SD 106 south	Northern terminus of SD 106
Richland		201.259	323.895	ND 18 north	Continuation into North Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus