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Highway 1806
SD 1806 highlighted in red
Route information
Maintained by SDDOT
Existed	1975–present
Southern Gregory County segment
South end	US 18 near Bonesteel
North end	Mule Head Road
Northern Gregory County segment
South end	Old 1806 Road south / Lakeview Drive
North end	SD 44 west of Platte
Lyman–Stanley Counties segment
Length	122.603 mi (197.310 km)
South end	SD 273 north of Kennebec
Major intersections	US 14 / US 83 / SD 34 in Fort Pierre
North end	Minneconjou Road near Mission Ridge
Corson County segment
South end	280 Avenue southwest of Mobridge
Major intersections	US 12 / SD 20 northeast of Mobridge
North end	BIA Rd. 3 to ND 1806 in Kenel
Location
Country	United States
State	South Dakota
Counties	Gregory, Lyman, Stanley, Corson
Highway system
South Dakota State Trunk Highway System Interstate US State
← SD 1804 → SD 8

South Dakota Highway 1806 (SD 1806) is a state highway in the U.S. state of South Dakota. It exists in four distinct sections. Its longest section begins at SD 273 and runs along the Missouri River nearly its whole length, serving Pierre. SD 1806 along with SD 1804 are numbered from the years of the Lewis and Clark Expedition.

Route description

Gregory County

Southern segment

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Northern segment

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Lyman and Stanley Counties

SD 1806 begins at the northern terminus of SD 273 in Lyman County and begins heading northwest. The route remains a two lane road and follows the Missouri River, heading towards Pierre. As it nears Pierre, the route becomes concurrent with US 83 and enters Fort Pierre. At the north end of Fort Pierre, US 83 becomes concurrent with US 14 heading east while SD 1806 splits from US 83 and becomes concurrent with US 14 and SD 34 for nearly a mile, heading west from the Deadwood Street and Yellowstone Street intersection. After one mile of concurrency, SD 1806 splits from US 14/SD 34 and heads north, passing by the Fort Pierre Chouteau National Historic Landmark and remaining parallel with the Missouri River. It then passes by Lake Oahe, intersecting the west end of SD 204 which passes over the Oahe Dam. SD 1806 continues west and remains parallel with the Missouri River until reaching Sansarc Road. The route continues northwest and ends at an intersection with Minneconjou Road south of Mission Ridge.

Corson County

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History

A portion of SD 1806 near Lake Oahe was numbered as SD 514. It was later redesignated into parts of SD 1804, SD 204, and part of today's portion of SD 1806.

Major intersections

County	Location	mi	km	Destinations	Notes
Gregory	​	15.68	25.23	US 18	Southern terminus; road continues unpaved as 361 Avenue
	​	23.86	38.40	Old 1806 Road north	To SD 1806 (Northern Gregory County segment)
	​	25.75	41.44	Mule Head Road	Continuation beyond northern terminus of southern segment
	Gap in route
	​	37.88	60.96	Old 1806 Road south / Lakeview Drive	Southern terminus of northern segment; road continues east as Lakeview Dr.; Old 1806 Rd. provides access to SD 1806 (Southern Gregory County segment)
	​	48.55	78.13	SD 44	Northern terminus
Gap in route
Lyman	Lower Brule Indian Reservation	138.45	222.81	SD 273 south / Lewis and Clark Trail	Southern terminus; northern terminus of SD 273; road continues east as Medicine Bull Memorial Highway (Iron Nation Road)
Stanley	Fort Pierre	180.05 116.94	289.76 188.20	US 83 south	Southern end of US 83 concurrency; mileposts change to reflect US 83 mileage
		138.73 227.73	223.26 366.50	US 14 / SD 34 east / US 83 north / Lewis and Clark Trail – Pierre	Northern end of US 83 concurrency; southern end of US 14/SD 34 concurrency; mileposts change to reflect US 14 mileage
		226.86 186.46	365.10 300.08	US 14 / SD 34 west – Philip	Northern end of US 14/SD 34 concurrency; mileposts change to reflect SD 1806 mileage
	​	191.60	308.35	SD 204 east to SD 1804	Western terminus of SD 204
	​	221.05	355.75	Minneconjou Road	Continuation beyond northern terminus
Gap in route
Corson	​	359.75	578.96	280 Avenue	Continuation beyond southern terminus
	​	363.43	584.88	US 12 / SD 20 west / Lewis and Clark Trail	Southern end of US 12/SD 20 concurrency
	​	364.61	586.78	US 12 / SD 20 east – Mobridge	Northern end of US 12/SD 20 concurrency
	​	370.13	595.67	SD 1806 Spur north – Wakpala	Southern terminus of unsigned SD 1806 Spur
	Kenel	386.83	622.54	BIA Rd. 3 / Lewis and Clark Trail	Continuation beyond northern terminus; to ND 1806
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

Wakpala spur

Highway 1806 Spur
Location	Wakpala
Length	1.8 mi (2.9 km)

South Dakota Highway 1806 Spur (SD 1806P) is a 1.8-mile (2.9 km) long spur route of SD 1806. Although unsigned, it provides access to the town of Wakpala, South Dakota, located in the Standing Rock Indian Reservation.

See also

• U.S. Roads portal

References

1. ^ "State Highway Log: Mitchell Region" (PDF). South Dakota Department of Transportation. January 2017. p. 161. Retrieved November 15, 2021.
2. ^ "State Highway Log: – Pierre Region" (PDF). South Dakota Department of Transportation. January 2019. pp. 18, 70–71, 97–99. Retrieved January 18, 2022.
3. "Highway Division Makes Road Numbering Changes". The Sioux Falls Argus-Leader. March 20, 1975. p. 2. Retrieved November 15, 2021 – via Newspapers.com.
4. Hunhoff, Bernie (June 14, 2016). "A River Road Called 1806". South Dakota Magazine. Retrieved November 15, 2021.

External links

• State highways in South Dakota
• Transportation in Gregory County, South Dakota
• Transportation in Lyman County, South Dakota
• Transportation in Stanley County, South Dakota
• Transportation in Corson County, South Dakota