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Rock of Ages Light

Location: off the southwestern end of Isle Royale in Lake Superior near Houghton, MI

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About Rock of Ages Light

The location of the light is off the southwestern end of Isle Royale in Lake Superior. The nearest city is Houghton, MI. The station was first established in 1908. The current lighthouse was first lit in 1908.

The tower has a flashing light at a focal plane height of 130 ft above mean high water. The light has a nominal range of 15 nautical miles. The tower height is 117 ft. The light has a period of 10 seconds.

Open to the Public?: Grounds Only    Active?: Yes

Identification number: 7-16655 (U.S.)

2 flashes every 10 seconds.

The light was automated in 1978.

A 'flashing' light is a light in which the total duration of light in a period is shorter than the total duration of darkness and the appearances of light (flashes) are usually of equal duration. So in the 10 second period, the light is on for less than 5 then off for more than 5.

Rock of Ages Light was listed on the National Register of Historic Places on Aug. 04, 1983, reference number 83000881.

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