Île de Grâce is located just downstream from Sorel-Tracy, and the main shipping channel passes between the southern tip of the island and the mainland at Sainte-Anne-de-Sorel. Built to mark the southern extremity of the island, Île de Grâce Lighthouse was a wooden, octagonal tower that measured twenty-five feet tall and exhibited a fixed white light using two flat-wick lamps set in fifteen-inch reflectors. A sixty-square-foot piece of land for the lighthouse was purchased from the church at Sorel for thirty dollars, and Edouard Paul, “a most respectable proprietor of land” opposite the island, was appointed first keeper of the light at an annual salary of $240.
In 1873, Keeper Paul petitioned the Department of Marine for an allowance for his service of preventing people from cutting down trees on Île de Grâce and nearby Île à la Pierre. While deforesting the islands would make the lights on them more visible to mariners, the trees served as useful barriers to the ice that piled up in the vicinity and was a danger to both life and property.
In 1897, ice tore off a section of the breakwater in front of the lighthouse and carried it about sixty feet away. Louis Beaulac of Sorel was paid $72 to repair and strengthen the pier and replace some iron plating that had been torn off and broken.
Two concrete piers were built on Île de Grâce during the autumn of 1905 to support a pair of range lights to replace the island’s lighthouse. The front pier was twenty-seven feet square at its base and tapered to fifteen feet square at its top, which was fourteen feet above the river. The back pier was twenty-eight feet square at its base, tapered to twenty-four feet square at its top, which was eighteen feet above the river, and had a sloping nose facing upstream to deflect ice floes.
The front lighthouse, a square white building having a steel frame sheathed with asbestos, surmounted by a square white lantern, all 19 feet high, standing on a square concrete pier with sloping sides, on the southern side of ile de Grace, exhibits, at 36 feet above high water, a fixed white light, visible in the line of range 5 miles.These ranges lights served to guide mariners along the channel near Sorel-Tracy between Île du Moine Range and Île Dupas Range, which were established, respectively, in August 1906 and the opening of navigation in 1907. Edouard Paul, keeper of the old Île de Grâce Lighthouse, assumed responsibility for the new front range light, and Louis Letendre was placed in charge of the new rear light.
The rear light is exhibited from a square brown skeleton tower, with white, wooden slatwork on upper portion of side facing channel; white, inclosed watch room and a white, square lantern with a red roof, the whole 63 feet high. The tower stands on the southeastern end of ile de Grace, 633 yards, 75°, from the front lighthouse, on a concrete pier with sloping sides and pointed upstream end. The light is fixed white, exhibited at 80 feet above high water, and visible in the range line 5 miles.
After the river had undermined the front pier, pilework was driven around the pier in 1907 and riprap was placed between the piles at a cost of $537. Both piers required additional protecting during the next two decades, and then in 1928, a new front range tower was built to replace the old one that was in danger of falling into the river due to the undermining of the bank. The new front tower consisted of a white, square wooden tower with sloping sides and a white square lantern room. It was located sixty-eight feet farther from the rear light, and displayed a fixed white light at a height of thirty-two feet.
Today, Île de Grâce Range exhibits fixed green lights visible on the axis of the range along with isophase green lights from both towers that are only visible over a narrow sector.
Keepers: Edouard Paul (1871 – 1906).