The Leslie Street Spit, officially known as Tommy Thompson Park, extends approximately five kilometres into Lake Ontario from the base of Leslie Street, just south of Lake Shore Blvd East. This artificial peninsula, constructed from decades of Toronto harbour dredging and construction fill, creates a dynamic navigation environment that demands careful attention from boaters. The park's western shore faces Toronto's inner harbour and offers relatively protected waters, while the eastern shore opens directly onto Lake Ontario, where sudden waves and shifting winds can challenge even experienced captains. Boaters approaching from the west should identify the prominent red and green channel markers that guide vessels past the Spit's tip, keeping well clear of the shallow shoals that extend offshore, particularly near the lighthouse at the southern end.
For those launching from nearby facilities, the Ashbridges Bay Yacht Club (ABYC) lies immediately west of the Spit's entrance, while Woodbine Beach and its associated boating infrastructure sits further to the east along the shoreline. Local knowledge becomes essential when navigating this stretch, as recreational kayakers, paddleboarders, and fishing boats frequently crisscross the narrow channel between the Spit and the mainland. The area between the Spit and the mainland—often called the Gap—can experience strong currents and confused seas when winds oppose the natural flow, making timing your passage critical. Summer weekends bring heavy traffic from the nearby marina districts, and the Toronto Harbour Commission's ongoing habitat restoration projects mean temporary buoys and restricted zones may appear without warning, so maintaining a proper lookout and monitoring VHF channel 16 remains essential.
Seasonal considerations significantly impact safe navigation around Tommy Thompson Park, with spring bringing cold-water hazards and autumn producing unpredictable squalls that sweep across the lake with little warning. The park itself is a designated Important Bird Area, and the Toronto and Region Conservation Authority manages access to protect nesting colonies of ring-billed gulls, common terns, and black-crowned night herons—meaning landing on most of the Spit is prohibited and boaters must respect the 30-metre no-wake zone along sensitive shorelines. For the most reliable passage, experienced local skippers recommend plotting a course that uses the main deep-water channel marked by the Tommy Thompson Park lighthouse (flashing white every 10 seconds), then rounding the tip at least 200 metres offshore before setting a course for the Scarborough Bluffs to the east or returning toward the sheltered waters of the Toronto Islands to the west. Whether you are a day sailor from ABYC or a visiting cruiser exploring Lake Ontario, respecting the Spit's unique geography and regulations ensures both your safety and the preservation of this remarkable Toronto waterfront landmark.