| Main Duck Island Light |
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| Nearest Town or City: | Kingston Ontario Canada |
| Location: | Entrance to St. Lawrence Seaway, Lake Ontario. |
| Managing Organization: | Canadian Coast Guard |
| Notes: | Main Duck Island has a sheltered harbor, one of the few in the area. The island is within St. Lawrence Islands National Park. |
| Tower Height: | 80 |
| Description Tower: | Octagonal concrete tower. |
| Operational: | Yes |
| Date Established: | 1914 |
| Date Present Tower Built: | 1914 |
| Current Use: | Active aid to navigation. |
| Open To Public: | On limited basis. |
| Directions: | Access is restricted but public tours are available - see www.pec.on.ca/naturestuff/quintenaturalist/mainducktours.html |
| Characteristic Range: | Flashing white every 6 seconds, visible for 17 miles. |
| Optics: | Third order Fresnel lens. |
| Height Focal Plane: | 77 |
| National Register: | No |
| Keepers: | J. Clark (1914-1915), Fred Bongard (1915-1921), Wesley Thomas (1921-1953), Harry Dunn (1954-1958), Coleman Main (1959-?), Charles Murray Ribble (assistant, c. 1959-?), Kenneth McConnell (c. 1960s), Fred Holdaway (assistant, c. 1960s) |
| State: | Ontario |
| Country: | Canada |






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