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}} The Detroit River Light, also known as Bar Point Shoal Light, was first established as a lightship in 1875. The current sparkplug lighthouse was built in 1885.〔 It sits in Lake Erie, south of the mouth of the Detroit River, from land and about from the Ambassador Bridge in the Detroit River. It is about from the border with Canada,〔NOAA Chart 14848 Detroit River Michigan Extension〕 and just under from Put-in-Bay, Ohio.〔(Photo of Detroit River Light. )〕 Its original 4th order Fresnel lens is on loan to the Michigan Maritime Museum.〔 ==Construction and infrastructure== The Detroit River Light replaced a Canadian lightship that had been posted in this channel location since 1875, guiding upbound vessels making a turn in the Detroit River. The United States Lighthouse Board completed the Detroit River Light in 1885 at a cost of $78,000. The Light was first lit on August 20, 1885.〔(Wobser, David, Bar Point Shoal Lighthouse at ) boatnerd.com〕 The crib was transported to the site from Amherstburg, Ontario. It was built pre-fabricated , sunk in of water, filled with concrete and surrounded by a granite pier. The light station pier is shaped like a vessel. Its pointed end is directed toward the mouth of the river to break river-powered ice floes. Above the crib and pier, the high cast iron boiler plate tower is in diameter at its base and at the top.〔 There is an attached storage building and radio beacon.〔(【引用サイトリンク】title=Detroit River Lighthouse )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Detroit River Light」の詳細全文を読む スポンサード リンク
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