In the US a lot of that is left to the discretion of the individual army corps of engineers districts to figure out for themselves.

In Green Bay, lake freighters can pass under the I-43 bridge and through downtown drawbridges without escort.

But just an hour north at Sturgeon Bay, they have to be met by a tug at Sherwood Point and guided in the last three miles.

In the US a lot of that is left to the discretion of the individual army corps of engineers districts to figure out for themselves.

In Green Bay, lake freighters can pass under the I-43 bridge and through downtown drawbridges without escort.

But just an hour north at Sturgeon Bay, they have to be met by a tug at Sherwood Point and guided in the last three miles.

And then up at Marinette, getting a Freedom class ship through the Ogden street bridge takes half an hour, several tugs, and a paint touchup afterwards.

In the US a lot of that is left to the discretion of the individual army corps of engineers districts to figure out for themselves.

In Green Bay, lake freighters can pass under the I-43 bridge and through downtown drawbridges without escort.

But just an hour north at Sturgeon Bay, they have to be met by a tug at Sherwood Point and guided in the last three miles.

And then up at Marinette, getting a Freedom class ship through the Ogden street bridge takes half an hour, several tugs, and usually some fresh paint afterwards