The Duluth ship canal is officially a ship channel, meaning it is maintained at a depth of around 30 feet at all times so that large 1,000 footers and ocean going ships can move safely thru the channel on their way in and out of Duluth. To maintain that depth, the channel has to be periodically dredged since wave action and propeller blades can build up silt, especially around the edges of the channel. Marine Tech moved their dredge out to the South Pier today, just beside the South Pier light, to work on some of the edges of the channel. They will be there for about 3 weeks providing another sight for visitors to look at and for today, something for the crew aboard the Tuscarora to watch while they wait at anchor to come into port to load grain. 
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