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Island Shoal Lighthouse Location:
Entrance
to Mount Bay
 1901 - present Lat 41
37 56 N - Long 71 16 23 W
Established: 1901
Lighthouse Constructed: 1901
Automated: 1964
Original Illuminating Apparatus:
Fifth Order Fresnel Lens
Current Illuminating Apparatus:
250-mm lens
Height: 60 feet
Status: Active Aid to Navigation
Light Characteristic: Fixed White (1906)
 Isophase White every 6 seconds (2005)
Range: 12½ miles (1906)
 12 miles (2005)
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