The following description of the Rivière Valin Range lights appeared in The Gulf and River St. Lawrence, published by the U.S. Hydrographic Office around 1900.
The front light is a fixed white light exhibited from a square white tower, 19 feet high, with diamond slatwork facing range line, on the northern bank of the Saguenay, eastward of the mouth of river Valin. The light is 18 feet above high water and is visible in clear weather a distance of 9 miles.
The back light is fixed white, exhibited from the top of a white-slatted framework with white shed, having a red roof, at the base of the framework, the whole being 35 feet high, and situated 315°, 710 feet from the front tower. The light is 35 feet above high water and visible in clear weather a distance of 11 miles.
The lights in line 315° lead toward northern shore of the river to intersection with Savards range.
In 1908, the range lights were replaced with a new pair of towers. The following description of these towers appeared in the Annual Report of the Department of Marine. “The front tower is a wooden building, square in plan, with sloping sides, surmounted by a square wooden lantern, and is 32 feet high from base to top of ventilator on lantern. The back tower is a 4-section steel skeleton structure, square in plan, with sloping sides, surmounted by an enclosed wooden watchroom and square wooden lantern. It is 64 feet high from base to top of ventilator on lantern. The front tower was erected by contract, by Mr. N. Warren, of Chicoutimi, P.Q., for $570. The back tower was purchased from the Goold, Shapley, Muir Company, of Brantford, Ont., for $540, and erected by day's labour, at a cost of $1,546.68.”
The new towers were separated by 1,126 feet. A seventh-order, 120° Chance lens with duplex lamp replaced the catoptric light formerly exhibited in the front tower, and a constant-level lamp with a twenty-inch silvered copper reflector was used in the new rear tower.
Sometime before 1995, the 1908 range lights were replaced with a pair of skeletal towers that display an orange trapezoidal daymark with a black vertical stripe. The enclosed portion of the 1908 rear tower is now located on private property near the modern front tower.