166th Street in Ash Township, South Dakota

166th Street in Clark County is an unpaved unclassified road. It runs in an east-west direction and crosses 413th Avenue, 414th Avenue, 415th Avenue, 416th Avenue, 418th Avenue, 419th Avenue, 422nd Avenue, 423rd Avenue, 424th Avenue, 425th Avenue and 427th Avenue and ends at 428th Avenue, while the other end is a cul-de-sac. It connects Ash Township, Woodland Township, Raymond Township and Thorp Township. 166th Street also exists in Eden Township.