Wyoming Highway 254Wyoming Highway 254 is a state road northwest of Casper, Wyoming known as Salt Creek Highway.Route descriptionWyoming Highway 254 begins its south end the town of Mills, just outside Casper at US 20 Business/US 26 Business. The highway continues north into the town of Bar Nunn at 0.79 miles. Highway 254 intersects US 20/US 26 at. WYO 254 continues north until, where it turns east onto Wardwell Road for a short distance and there meets I-25/US 87, where WYO 254 ends.HistoryWyoming Highway 254 is the former alignment of US 87 prior to relocation along I-25.