 When it crosses the Huron River, the trunkline enters Wayne County between South Rockwood and Rockwood.On the north side of the county line, I-75 begins to run inland of, and parallel to, the Detroit River, entering the Downriver area.The freeway turns northerly after the interchange with M-85 (Fort Street) near Gibraltar, and the LECT departs I-75 to follow M-85 north of the interchange.