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.[4]
^"State Highway Log: Mitchell Region" (PDF). South Dakota Department of Transportation. January 2017. p. 161. Retrieved November 15, 2021.
^"State Highway Log: – Pierre Region" (PDF). South Dakota Department of Transportation. January 2019. pp. 18, 70–71, 97–99. Retrieved January 18, 2022.
^"Highway Division Makes Road Numbering Changes". The Sioux Falls Argus-Leader. March 20, 1975. p. 2. Retrieved November 15, 2021 – via Newspapers.com.
^Hunhoff, Bernie (June 14, 2016). "A River Road Called 1806". South Dakota Magazine. Retrieved November 15, 2021.
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Global Information
US 18 near Bonesteel
SD 44 west of Platte
SD 273 north of Kennebec
US 14 / US 83 / SD 34 in Fort Pierre
US 12 / SD 20 northeast of Mobridge
ND 1806 in Kenel
