Callie M. (Marine Tech of Duluth)

Manitowoc

Callie M. was built in 1910, is 64 feet long and flies a U.S. flag

Miss Laura
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Picture above taken Saturday, June 13, 2009.
A harbor like ours absorbs a lot of activity; with ice, high winds, big boats and little boats. For the big boats to successfully move around in the harbor, there has to a depth of at least 29 feet in all the shipping channels. The material on the bottom, mostly sand, is easily moved around and sometimes up, so to speak, and the depth can get too close to that limit.
Below, the tug Callie M. is pushing the barge while we see the Paul R. Tregurtha in the background, on August 18, 2011. When that happens, boats can go aground, or get stuck on the bottom. Dredging is the solution and in Duluth, that solution is often provided by a Marine Tech rig that is a combination of many things.
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It is a crane barge, called the Dean R. Smith, with a scoop at the end of the line which is dropped down to scoop up sand from the bottom of the harbor. The crane pulls up the scoop and drops the material into a barge. Their tug, the Callie M, performs a variety of tasks but most important, it ferries two barges to and from the dredge, taking the barge away from the rig when it is full and providing an empty barge to take its place while the tug then takes the filled barge to another place in the harbor where the fill is discharged. This process is slow and the rig can often be seen in a particular area of the harbor for weeks at a time.

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