US 81 (SD) Travel Info
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U.S. Route 81 is one of the many United States Numbered Highways established in 1926 by the US Department of Agriculture Bureau of Public Roads.
The route of US-81 follows that of the old Meridian Highway (so called because it roughly followed the Sixth Principal Meridian of the US Public Land Survey System) which dates back as early as 1911. The highway has alt ... more
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