Gravelly Shoal Light
Gravelly Shoals Light is an automated lighthouse that is an active aid to navigation on the shallow shoals extending southeast from Point Lookout on the western side of Saginaw Bay. The light is situated about 2.7 miles (4.3 km) offshore and was built to help guide boats through the deeper water between the southeast end of Gravelly Shoals and Charity Island. Architecturally this is considered to be Art Deco style.
Undated USCG photo | |
| Location | Saginaw Bay, Michigan |
|---|---|
| Coordinates | 44°1′6″N 83°32′14″W |
| Tower | |
| Constructed | 1939 |
| Foundation | 50-foot (15 m) diameter concrete pier |
| Construction | Steel-sided tower |
| Height | 65 feet (20 m) |
| Shape | Art Deco |
| Markings | white, gray scaffold atop |
| Fog signal | Every 30 seconds, operates year round. Radio beacon signal transmitted at 296 kHz, and emitted a group of 0.5 -second dashes for 15.5 seconds, followed by 14.5 seconds of silence. |
| Racon | oui |
| Light | |
| First lit | 1939 |
| Focal height | 75 feet (23 m) |
| Lens | 14.8-inch (375 mm) lens |
| Intensity | 15,000 candela |
| Range | 9.6 nautical miles; 18 kilometres (11 mi) |
| Characteristic | red flash every 6 seconds |
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