South Dakota Highway 224South Dakota State Highway 224 is a state highway located in south-central South Dakota. It connects the town of Alpena to SD 37.Route descriptionSD 224 begins at Willow Avenue in the town of Alpena in Jerauld County. The highway travels due east on 221st Street, crossing over a railroad and leaving the town, into Sanborn County. From the county line, SD 224 continues to a junction with SD 37, where the highway ends.HistorySD 224 was designated in 1976 on a segment of former South Dakota Highway 32.