| Owner | Manager | From | Until | | Alvin J. Misner & Erwin G. Trelford - Canada | | 1915 | 1922 |
| Ontario Ministry of Game and Fisheries - Canada | | 1922 | 1940 |
| A.B. McLean & Sons - Canada | | 1940 | 1994 |
| Purvis Marine Ltd. - Canada | | 1994 | 1996 |
| Nadro Marine Services - Port Dover, Ontario, Canada | | 1996 | 2004 |
| Thunder Bay Tug Services - Canada | | 2004 | |
|
| Fleet | From | Until | | A.B. McLean & Sons Ltd. - Sault Ste. Marie, Ontario, Canada | 1940 | 1994 |
| Nadro Marine Services - Port Dover, Ontario | 1996 | 2004 |
| Thunder Bay Tug Services Ltd. - Canada | 2004 | |
|