- South Dakota Highway 20
starting_terminus=Montana border west of Camp Crook
ending_terminus= east of Revillo
cities=Buffalo, Bison, Timber Lake, Mobridge, Selby, Hoven, Mellette, Florence, Watertown, South Shore, Revillo
South Dakota Highway 20 is a state route that largely runs from border to border across the northern part of the
U.S. stateof South Dakota. It consists of two segments:
* The longer segment begins at the
Montanaborder west of Camp Crook, and terminates at the junction of U.S. Highway 212in Watertown. This segment is 393 miles in length.
* A second segment begins at a junction with the old alignment of
U.S. Highway 81west of Interstate 29exit 193. It continues eastward to the Minnesotaborder east of Revillo, continuing as Minnesota State Highway 40. This second segment is 39 miles in length.
The total length of this route is 432 miles (695 kilometers).
South Dakota 20 was implemented in 1929, but it was much shorter. The western terminus was at
South Dakota Highway 45northeast of Faulkton, and terminated in Watertown. Around 1944, the western terminus was moved further west, to U.S. Highway 83.
In the early 1950's, a short extension west was made again, to the town of Akaska. The eastern terminus was moved as well, to
U.S. Highway 77south of Milbank; the extension to the Minnesota border occurred in 1954.
In the late 1960's, the short stub between Akaska and U.S. 83 was redesignated as
South Dakota Highway 20 Spur. SD 20 was extended northward along U.S. 83 to U.S. Highway 12, then through Mobridge and across north central and northwest South Dakota, absorbing the alignment of what had been South Dakota Highway 8.
List of Counties
South Dakota 20 currently travels through the following counties, from west to east:
The route of SD 20 is defined in South Dakota Codified Laws [http://legis.state.sd.us/statutes/DisplayStatute.aspx?Type=Statute&Statute=31-4-145 § 31-4-145] .
* [http://www.northernplainshighways.org/sdakota/sd1-30.html#SD-20 South Dakota Highways Page: Highways 1-30]
Wikimedia Foundation. 2010.
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