Lock 42 - Couchiching

Trent-Severn Waterway National Historic Site

The Trent-Severn Waterway National Historic Site 2026 navigation season will open in stages starting on Friday, May 15, 2026.

Increased precipitation in March and April, coupled with significant snowpack in both the Trent and Severn watersheds, has necessitated additional time to reduce water levels and flows to ensure safe boating conditions across the system.

Lock 42 - Couchiching to Lock 45 - Port Severn are closed to navigation until further notice. All lockstations will remain open to land-based visitation.

This is a very busy lock station on weekends as many boaters make the trip from Lake Simcoe to Georgian Bay and return. Some souvenirs and charts may be purchased at the lock.

Getting here
  • Address: 2597 Bonsor Rd., Severn Bridge, Ontario
  • Nautical chart: #2028 (more on Nautical charts)
  • Kilometer marker: 337.8 km (mile 209.9)
  • GPS: 44°46'11.1"N 79°21'01.5"W

Hours of Operation

Contact:
Navigational data
  • Lock length: 47.2 m (155 ft)
  • Lock width: 9.7 m (32 ft)
  • Average lift: 6.2 m (20 ft)
  • Max. mooring period: 2 nights
Facilities and services
History
Construction of the Couchiching lockstation
Constructed: 1914-1920

The last lock to be built, this section of the Severn Division commenced in August 1914, but work stopped in 1917 due to wartime shortages. Construction re-commenced in 1919 and the lock was officially opened in July 1920. In addition to the lock, the contractors also built a new railway bridge for the Candian National Railway that was diverted because of the canal.

Tourism information
Videos
Parks Canada on Youtube

Related links

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