South Dakota Highway 16
Encyclopedia
History
South Dakota 16 was designated in the 1920s, as a number for the Yellowstone TrailYellowstone Trail
The Yellowstone Trail was the first transcontinental automobile highway through the upper tier of states in the United States. It ran from Massachusetts to Seattle. It was conceived by J.W. Parmley of Ipswich, South Dakota in 1912. Originally, Parmley and his business colleagues wanted a good road...
across the state. When the U.S. highway system was implemented in 1926, this road was designated as part of U.S. Highway 12. After a short period of dual signage, the SD 16 designation was dropped.