It's spring in Michigan when the Soo Locks open.
https://www.wxyz.com/news/soo-locks-to-open-for-2023-great-lakes-shipping-season-at-midnight
There are two active #SooLocks currently. The Frontenac is able to use the smaller of the two, and it's the same lock that allows freighters to go from the Atlantic Ocean into Lake Superior. #saultstemarie