The light is at the end of a reef that extends about 1,500 feet south from the island. The location first had a stone beacon in 1832. The first light, a sparkplug type light, was lit in 1890. It cost about $50,000. It included a three story dwelling, a veranda with boat davits, and a circular parapet. The water supply was a cistern in the base of the structure. A spiral staircase ran from the cellar to the top floor. It had a fixed white light, which was changed to flashing red every thirty seconds and then to the present alternating red and white flashes.

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Photo credit: © The Protected Art Archive / Alamy / Afripics
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Keywords: boston, deer, harbor, island, light, navigation