Highway 16B from U.S. Highway 16 to Interstate Highway 90. The state trunk highway system includes the following in Pennington County: From a point on U.S. Highway 16 near the east - west quarter line of section twenty - six, township one north, range seven east, thence east and northerly to a point on Interstate Highway 90. Source: SL 1988, ch 232 ; SL 1994, ch 237 , § 1.