Cloudscape Series III.

This is the last one, I promise! 

Here the sun is rising over the St. Mary's River that acts as
a border between Canada and the US and provides
a waterway for the Great Lakes Iron Ore shipping.
It connects Lake Superior and Lake Huron.  Because
Lake Superior is a higher elevation then Huron, a
Locks system was constructed.  It is quite interesting
to watch these huge ore boats being lowered or
lifted to a different level of water.  The ships that
pass through are as huge as ocean-going ships.
Lake freighter - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Lake_freighter