The state trunk highway system includes the following in Charles Mix, Hughes, Sully, Potter, Walworth, and Campbell counties: (1) From a point south of State Highway 50 near the southwest corner of section nineteen, township ninety-six north, range sixty-six west, thence northerly to State Highway 50 near the southwest corner of section thirty-one, township ninety-seven north, range sixty-six west; (2) From a point south of State Highway 44 near the southwest corner of section thirteen, township ninety-eight north, range sixty-nine west, thence northwesterly to State Highway 44 west of Platte near the northwest corner of section twenty-two, township ninety-nine north, range sixty-nine west; (3) From a point on U.S. Highway 14 in Pierre in the southwest southeast quarter of section twenty-eight twenty-two, township one hundred eleven north, range seventy-nine west, thence southwesterly, thence northerly along Oahe Reservoir 25 to U.S. Highway 212 west of Gettysburg in section twenty-nine, township one hundred eighteen north, range seventy-eight west; (4) From a point on U.S. Highway 212 west of Gettysburg near the southwest corner of section twenty-four, township one hundred eighteen north, range seventy-eight west, thence northerly to a point near the northwest corner of section two, township one hundred eighteen north, range seventy-eight west; (5) From a point south of U.S. Highway 12 near the northeast corner of section thirty-five, township one hundred twenty-three north, range seventy-eight west, thence northwesterly along Oahe Reservoir to U.S. Highway 12 east of Mobridge west of the northeast corner of section twenty-six, township one hundred twenty-four north, range seventy-nine west; and (6) From a point on U.S. Highway 12 in Mobridge near the southwest corner of section twenty, township one hundred twenty-four north, range seventy-nine west, thence northerly along Oahe Reservoir via Mobridge and Pollock to the North Dakota state line west of the northeast corner of section five, township one hundred twenty-eight north, range seventy-nine west. 16