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Trent-Severn Waterway National Historic Site of Canada

Lock 45 - Port Severn

Lock 45 - Port Severn

387.1 (mile 240.6)
25.6 m (84 ft)
7.0 m (23 ft)
Average Lift:
3.7 m (12 ft)
(705) 538-2586
Tourist Centre:

Southeast Georgian Bay Chamber of Commerce
Tel.: (705) 756-4863

Simcoe County - Huronia Tourism Association
Tel: (705) 726-9300 ext 220 or 1-800-487-6642

Muskoka Tourism
Tel: 1-800-267-9700

Southern Georgian Bay Chamber of Commerce
Tel: (705) 526-7884 or 1-800-263-7745


Port Severn is the northern gateway, and the smallest lock on the Waterway. Its 25.6 metre (84 ft) length limits the size of vessel that can through-navigate the entire Waterway. It is a quick boat ride from Georgian Bay Islands National Park. Lock 45 has large grounds for boater camping and picnicking. Boaters should exercise caution to the west of the lock where they pass under Highway 400, as the channel width is restricted. In periods of high water flows, boaters should be prepared to be buffeted by currents in the navigation channel below the lock.