Lake Ontario's 1,100 kilometres of shoreline required a reliable system of navigational aids long before radio, GPS, or electric light. The lighthouses built between the early 1800s and the mid-twentieth century served commercial shipping, military transport, and the passenger steamers that connected Ontario's port towns. Several of those structures still stand today — some as active aids to navigation, others maintained by local heritage groups.
Gibraltar Point: The Oldest Surviving Lighthouse on the Great Lakes
Construction of the Gibraltar Point Lighthouse began in 1808 on the Toronto Islands, then known as Peninsula York. At the time, York — present-day Toronto — was the capital of Upper Canada, and its harbour was the primary entry point for goods, settlers, and government supplies arriving by water. The lighthouse was built of local limestone and originally stood approximately 15 metres tall.
The structure was raised in height twice during the nineteenth century as vessel traffic increased and as sedimentation altered the configuration of the sandbar at the harbour entrance. By 1832 it had reached approximately 26 metres, roughly the height visible today. The light was converted from oil lamp to kerosene during the 1870s, and the lighthouse was decommissioned as an active aid to navigation in the early twentieth century when the harbour channel was deepened and new range lights were installed on fixed structures nearer the Eastern Gap.
Today, Gibraltar Point Lighthouse is a National Historic Site of Canada. The Toronto and Region Conservation Authority manages the surrounding lands, and the structure is accessible to visitors who arrive on the Toronto Islands ferry during operating months. The masonry is in sound condition; the lantern room interior is not open to the public.
Range Lights and Harbour Stations Along the Northern Shore
Beyond Gibraltar Point, Lake Ontario's Canadian shore was lined with a series of range light pairs and harbour-entrance beacons. A range light system uses two fixed lights — one higher and further inland, one lower at the water's edge — so that mariners can align the two vertically to confirm they are on the correct approach bearing. The design is well-suited to shallow harbour entrances where a fractional deviation from the safe channel means grounding.
The ports of Cobourg, Port Hope, Presqu'ile, and Trenton each maintained lighthouse infrastructure at various points during the nineteenth century. Many of these were timber-frame structures on crib foundations — built quickly, practical in function, and subject to regular replacement as ice damage and rot degraded the materials. The stone towers, like Gibraltar Point, survived because local limestone proved more durable and because the sites they occupied remained strategically relevant.
The Kingston Area: Multiple Towers at a Strategic Narrows
Kingston sat at the point where Lake Ontario empties into the St. Lawrence River system, and its significance as a naval and commercial hub meant more lighthouse infrastructure was concentrated here than anywhere else on the lake's Canadian side. The fortified island of Point Frederick was equipped with a lighthouse in the 1820s as part of a broader effort to guide Royal Navy vessels through the narrows. Later, civilian shipping required additional aids at Simcoe Island and along the eastern approaches to Kingston Harbour.
The Nine Mile Point Lighthouse on Simcoe Island was first lit in 1833. The current structure dates from 1864 — a hexagonal limestone tower approximately 14 metres in height. It remained in operation as an active aid to navigation into the modern era, making it one of the longer-serving nineteenth-century lighthouses on the Great Lakes. Parks Canada administers Simcoe Island as part of the Kingston area national park holdings.
Preservation: Who Maintains These Structures Today
Federal responsibility for lighthouse maintenance in Canada rests with the Department of Fisheries and Oceans, which oversees the Canadian Coast Guard's aids-to-navigation program. Under the Heritage Lighthouse Protection Act, passed in 2008, any federal lighthouse can be formally declared a heritage lighthouse and transferred to another level of government or a non-profit organization for preservation.
The process requires a public petitioning period and an assessment of the structure's heritage significance. Several Lake Ontario lighthouses have undergone this process. Community groups in Presqu'ile Provincial Park and along the Prince Edward County shoreline have taken custody of structures that would otherwise have faced demolition or simple abandonment once removed from the active aids-to-navigation system.
The Lighthouse Preservation Society of Ontario maintains a registry of at-risk structures and has published documentation on the construction methods and operating history of the province's lighthouse inventory. Their records, based on Library and Archives Canada materials, represent the most comprehensive public-access database of Ontario lighthouse history currently available.
Technical Notes on Construction
Early Lake Ontario lighthouses were built using one of three structural approaches: dressed limestone ashlar, rubble-stone masonry, or timber frame on a stone or crib foundation. The ashlar towers, like Gibraltar Point and Nine Mile Point, proved most durable. The timber-frame structures required rebuilding on a cycle of twenty to forty years depending on site conditions and maintenance budgets. Crib foundations — timber boxes filled with stone and sunk to the lake bottom — were used for offshore structures and were subject to damage from ice shove in severe winters.
The lightkeepers who maintained these stations were federal government employees responsible for trimming the lamp wicks, maintaining the lens and reflector assembly, keeping the fog signal operational, and logging vessel traffic. Keeper's dwellings were built adjacent to the tower on inhabited stations; on exposed offshore sites, the keeper lived in quarters built into the base of the tower itself.
References and further reading: Parks Canada — Gibraltar Point Lighthouse National Historic Site · Heritage Lighthouse Protection Act (Justice Canada) · Library and Archives Canada, RG 11 — Department of Public Works records (lighthouse construction files)