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This is what I think, but don’t bet on it.
The Presque Isle left here on March 22th with a partial load of pellets and I think loaded pellets at Two Harbors and then tried to get to the other end of Lake Superior but had ice trouble and came back here for repairs, arriving on March 29th still with her pellets. Some of those pellets were off loaded into the American Spirit, which had not yet left Duluth. She offloaded pellets to make repairs easier.
The American Spirit left here on April 7th with pellets loaded from the Presque Isle. She went to Two Harbors to load pellets and then came back this morning (above) with both loads of pellets. To wait, I presume.
Two days later, on March 28th, the Alder arrived Duluth with an ice-wounded Morro Bay lashed to her side with the Katmai Bay leading them under the Lift Bridge.
Several days later, the Katmai Bay departed to return to ice breaking duties while the Morro Bay stayed here for repairs to her rudder. That happened early this week and she left but did not go very far away. The Katmai Bay returned to Duluth this morning, April 9th (above), and the Morro Bay was back at the DECC with the Katmai Bay by late this afternoon.
Meanwhile at the other end of the Lake, late this afternoon, the Canadian ice breaker Pierrre Radisson left the Soo leading a convoy of boats trying to get to Duluth (Click on the the map above). The Mackinaw was going to be with the convoy but as I write this, she was still at the Soo.
So here is my guess. When the convoy arrives here, perhaps on Thursday or Friday, we will have 5 ice breakers here, counting the Alder. All of a sudden, we will/may have a bunch of boats here to load cargo and then go back out to the lake, I would guess with the help of some of our flotilla of ice breakers. And presumably the American Spirit came back and is waiting to be a part of that convey.
You can find the satellite images here: http://coastwatch.glerl.noaa.gov/index.html
Just click on MODIS Imagery; Great Lakes MODIS True Color; and then select the lake you want, such as Superior