So the last ship I saw at the Soo Locks was the James R. Barker. She was pulling in as the Oberstar was pulling out. I didn't stay to watch her go through the Locks because I wanted to catch a couple more shots of the Oberstar in the St. Mary's River.
blog, although I think the last time I saw her was at the Soo Locks. I'm pretty sure her normal routes don't take her past Detroit that much.