Lock 20 - Ashburnham

Trent-Severn Waterway National Historic Site

Lock 20 is located at the northeastern corner of Little Lake in Peterborough. Located away from busy roads, this lock station makes for a quiet stop within the city limits. Boaters can walk or bike on the Trans Canada Trail, which cuts through the site. A beautiful location for overnight mooring, especially on Wednesday and Saturday evenings in the summer, where the Little Lake fireworks can be enjoyed from the lower tie up walls.

Getting here
  • Address: 175 Maria St, Peterborough, Ontario
  • Nautical chart: #2022 (more on Nautical charts)
  • Kilometer marker: 144.5 km (mile 89.5)
  • GPS: 44°17'59.0"N 78°18'15.9"W

Hours of Operation


Navigational data
  • Lock length: 36.6 m (120 ft)
  • Lock width: 9.7 m (32 ft)
  • Average lift: 3.7 m (12 ft)
  • Max. mooring period: 2 nights

Facilities and services
Lock 20 Ashburnham
Constructed: 1896-1900

Located on the shore of Little Lake and the Trans-Canada Trail, the lock provided access to the artificial canal cut leading to the Peterborough Lift Lock. Originally the site of private homes, the property was converted to workshops, a maintenance yard and docking area for the canal work crew. Today the original Lockmaster’s Watch House from Lock 20 is being used as a mini-museum at Lock 32.

Tourism information
Google StreetView
Parks Canada on Youtube

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