South Dakota Highway 25

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Highway 25
Map of South Dakota with SD 25 in red
Route information
Maintained by SDDOT
Length	194.524 mi[1][2] (313.056 km)
Existed	1926[citation needed]–present
Southern segment
Length	19.529 mi[1] (31.429 km)
South end	SD 50 northwest of Tabor
Major intersections	SD 46 south of Scotland
North end	US 18 west of Olivet
Northern segment
Length	174.995 mi[1][2] (281.627 km)
South end	SD 262 northwest of Emery
Major intersections	I-90 near Alexandria US 14 in De Smet US 212 west of Henry US 12 in Webster
North end	ND 18 at the North Dakota state line north of Claire City
Location
Country	United States
State	South Dakota
Counties	Bon Homme, Hutchinson, Hanson, Miner, Kingsbury, Clark, Day, Marshall, Roberts
Highway system
South Dakota State Trunk Highway System Interstate US State
← SD 24 → SD 26

South Dakota Highway 25 (SD 25) is a 194.524-mile-long (313.056 km) state highway in the eastern part of the U.S. state of South Dakota. It connects Scotland, Howard, De Smet, and Webster.

It consists of two disconnected segments. Its shorter southern segment extends 19.529 miles (31.429 km) from SD 50 northwest of Tabor to U.S. Route 18 (US 18) west of Olivet. Its much-longer northern segment extends 174.995 miles (281.627 km) from SD 262 northwest of Emery, through Howard, De Smet, and Webster, to the North Dakota state line. Here, the roadway continues as North Dakota Highway 18 (ND 18).

SD 25's northern segment was established in 1926, with its southern terminus in Howard. From what is now SD 262, the SD 25 designated was applied to the road as construction occurred. Therefore, the northern terminus was at Farmer by 1971, Epiphany by 1977, and the Howard area by 1981. It was shifted west out of Howard in the early 1950s. Its northern path took a zigzag route northward. From De Smet, it went through Clark to Webster. It went west approximately 15 miles (24 km) and headed north to Britton. It then met the North Dakota state line northeast of Kidder. Part of this path is now SD 27. It was then shifted to its current path. In the mid-1970s, it utilized former SD 23 from Webster to Lake City. Between Hammer and the state line, it utilized part of SD 15's former path. The southern segment was the path of former SD 35. It was redesignated in 1976.