Owner | Manager | From | Until | Whitney Brothers Company - Superior, Wisconsin, USA | | 1920 | 1931 |
Merritt, Chapman & Scott Corporation - United States | | 1931 | 1963 |
Zenith Dredge Company - Duluth, Minnesota, USA | | 1963 | 1975 |
Gaelic Tugboat Company - Detroit, Michigan, USA | | 1975 | 1992 |
Hannah Marine Corporation - Lemont, Illinois, USA | | 1992 | 2009 |
Calumet River Fleeting - Chicago, Illinois, USA | | 2009 | 2012 |
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