The wooden lighthouse stood upon a wooden pier, and the lighthouse was removed at the end of each navigation season so it would not be damaged by ice floes the next spring.
In 1907, a new concrete pier was built over the wooden one, which was badly decayed. The concrete pier was twenty-four feet square at its base, eighteen feet square at its top, and stood six-and-a-half feet tall. The cost of the new pier was $985. The following year, a two-section, steel, skeletal tower was erected on the concrete pier in place of the wooden, octagonal lighthouse at a cost of $1,108. The skeletal tower was square in plan and was surmounted by an octagonal wooden lantern. Before arriving at Île à la Bague, the skeletal tower had served at Port Saint-François Range from 1902 until 1906 and at Île aux Prunes from 1896 to 1902.
Keeper Louis Dubois was dismissed in 1912 for political partisanship after an investigation was held based on representations made by Jos. Morin of Montreal and supported by a petition of electors from Repentigny parish. Eloi Thouin of Repentigny was appointed keeper in place of Louis Dubois on the recommendation of Jos. Morin, and Keeper Thouin served until 1914, when Île à la Bague Lighthouse was discontinued and taken down after the establishment of the nearby Île Lebel Range Lights. Keeper Thouin was transferred downstream to serve as keeper of the new rear light of Île Lebel Range.
Keepers:Joseph Ethier (1855 – 1883), Onesime Mercier (1883 – 1902), Louis Dubois (1903 – 1912), Eloi Thouin (1912 – 1914).
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