31-4-222.State Highway 251 from Nebraska to U. S. Highway 18.The state trunk highway system include the following in Gregory County:From a point on the Nebraska state line south of Gregory near the southeast corner of section thirty-five, township ninety-five north, range seventy-three west, thence north to U.S. Highway 18 near the northeast corner of section fourteen, township ninety-seven north, range seventy-three west. Source: SL 1984, ch 209, §95.
South Dakota Legal Code