Martin Reef Light
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| Location | N Lake Huron, 4.3 miles (6.9 km) S of Cadogan Point |
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| Coordinates | 45°54′48″N 84°8′54″W / 45.91333°N 84.14833°WCoordinates: 45°54′48″N 84°8′54″W / 45.91333°N 84.14833°W |
| Year first lit | 1927 |
| Deactivated | N/A |
| Foundation | crib |
| Construction | reinforced concrete & steel |
| Tower shape | square |
| Markings / pattern | white with red roof |
| Height | 52 feet (16 m) |
| Focal height | 65 feet (20 m) |
| Original lens | fourth order Fresnel lens |
| Current lens | 7.9-inch (200 mm) acrylic lens |
| Range | 13 nautical miles (24 km; 15 mi) |
| Characteristic | FI R 10s |
| ARLHS number | USA-480 |
| USCG number |
7-12205 |
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Martin Reef Light Station
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| Nearest city | Clark Township, Michigan |
| Area | less than one acre |
| Architect | US Lighthouse Service |
| MPS | Light Stations of the United States MPS |
| NRHP reference # | 05000743 |
| Added to NRHP | July 27, 2005 |
| Heritage | place listed on the National Register of Historic Places 
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7-12205
The Martin Reef Light Station is a lighthouse located in northern Lake Huron, 4.3 miles (6.9 km) south of Cadogan Point in Clark Township, Michigan. It was listed on the National Register of Historic Places in 2005.
At the end of the 19th century, the availability of iron ore from the Upper Peninsula caused shipping traffic through the Great Lakes to increase tremendously. Martin Reef, only a few inches deep in its shallowest area, was a significant hazard for ships approaching the Straits of Mackinac. In 1896, the Lighthouse Board asked for funds to be allocated to construct a lightship to station at the reef. However, despite repeated requests, it was not until 1906 that Congress approved the request. Plans were drawn up to construct a lightship designated LV89. In 1907, the Racine-Truscott-Shell Boat building Company of Muskegon, Michigan was awarded a contract to build the steel-hulled vessel. The vessel was completed in 1908, but was not stationed on the reef until the beginning of the 1909 shipping season.
However, over the next few decades, ships in the Great Lakes became larger and larger, and extended the shipping season past the times that LC89 was able to stay on station due to winter ice. In the 1920s, the Lighthouse Service began designing a permanent structure to replace the lightship on Martin Reef, and soon funds were allocated for construction. Work was started in the summer of 1927, and once the pier structure was complete, a temporary light was rigged and LV89 was removed and stationed at North Manitou Shoal in Lake Michigan. The entire project was completed in the summer of 1927.
In 1939, the Coast Guard assumed responsibility for the nation's lighthouses. They installed electric generators at Martin Reef to power the light. At some point, the station was automated, and the original Fresnel lens was removed and replaced with a 7.9-inch (200 mm) acrylic optic. The original lens is on display at the museum at the Point Iroquois Light. In 2000, the ownership of the light station was turned over to the Bureau of Indian Affairs.
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