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tons (1,673 t). Any vessels that just ascended in the top caisson exit into the upper reach, and any new vessels making a transit of the lock then enter the bottom or top caisson from the lower or upper reach respectively. Once the vessels are secured, all gates are closed and the crossover valve in the connecting pipe between the ram shafts is opened. Since the upper caisson weighs more than the lower caisson (1,844 vs 1,700 tons), it pushes down on its ram, forcing out water from its shaft via the connecting pipe into the shaft of the bottom caisson. The force pushes up on the bottom caisson's ram, raising the caisson up to the top position. When the gate of the newly descended top caisson and lower reach gates open at the bottom, the extra foot of water flows out and equalizes with the water level in the lower reach of the canal, and any descended vessels exit, allowing the cycle to start over again.
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ultrasonic sensors are used to help determine the differential. The upper reach and top caisson gates open, and water flows into the top caisson until the level equalizes. The weight of the extra foot of water is 144 short tons (131 t), making the total weight of the upper caisson 1,844 short
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was taking place and in order to shore up local support the project was fast tracked. In 1896 construction was approved and contractors signed on prior to any real working drawings being ready. The government still fell, and
Richard Rogers, who was concerned about his links to the former
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principle. One caisson always ascends and the other always descends during each locking cycle. When one caisson reaches the top position, it stops 12 inches (30 cm) below the water level of the upper reach, and the control valve is closed;
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The caissons are 140 ft (43 m) long, 33 ft (10 m) wide, and 7 ft (2.1 m) deep and when filled with 228,093 imperial gallons (1,036.93 m; 1,036,930 L) of water weigh 1,700 short tons (1,500 t).
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of
Montreal, which completed the metal work including rams, presses and large caissons, and was finished in 1904. The lift lock officially opened to the public to a crowd of thousands on 9 July 1904, and remains in full use today.
426:, the shafts for which are sunk into the ground, are filled with water, and are connected with a pipe that has a crossover control valve. The caissons are guided up and down on either side by rails affixed to concrete towers.
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boat lifts in the world, raising boats 65 ft (20 m). This was a considerable accomplishment in the first years of the 20th century, when conventional locks usually only had a 7 ft (2.1 m) rise.
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In the 1980s, a visitor centre was built beside the lock. It offers interactive simulations of going over the lift lock in a boat, and historical exhibits detailing the construction of the lift lock.
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The final project included many engineering firsts. It was the first lock to be built out of concrete, and at the time was the largest structure ever built in the world with unreinforced concrete.
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of the canal at the junctions with the caissons. The gates on the caissons fit into slots on the gates on the reaches, so that they open in unison.
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in which vessels ascend and descend. Both caissons are enclosed at each end by pivoting gates, and there are pivoting gates at the upper and lower
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administration, only released portions of the working drawings bit by bit. It worked, allowing him to remain on the job as the main designer.
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Construction was by Corry and
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Peterborough
Victoria Northumberland and Clarington Catholic District School Board
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Part of the reason that the lift lock was built was political. At the time a
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A Respectable Ditch: A History of the Trent-Severn
Waterway 1833-1920
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Exhibition of historical lift models at the
Peterborough Lift Lock
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687:. McGill-Queens University Press, Montreal and Kingston, 1988.
533:"Peterborough Lift Lock National Historic Site of Canada"
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Each caisson sits on a 7.5 ft (2.3 m) diameter
737:- Trent-Severn Waterway National Historic Site of Canada
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No external power is needed: the lift lock functions by
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The Trent-Severn has a similar hydraulic lift lock, the
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For many years, the lock's dual lifts were the highest
660:"Improved level measurement for historic lift lock"
51:. Unsourced material may be challenged and removed.
1227:Conseil scolaire de district catholique Centre-Sud
1335:Buildings and structures in Peterborough, Ontario
577:"Peterborough Hydraulic (Canal) Lift Lock (1904)"
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377:on the canal below the lift lock in the winter.
604:. The American Society of Mechanical Engineers
1365:Transport buildings and structures in Ontario
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411:The lock has two identical bathtub-like ship
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380:The Peterborough Lift Lock was designated a
1360:Transport infrastructure completed in 1904
1191:Ministry of Natural Resources and Forestry
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725:Site for the lift lock's 100th anniversary
602:"Peterborough Hydraulic (Canal) Lift Lock"
583:. American Society of Mechanical Engineers
537:Directory of Federal Heritage Designations
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1217:Kawartha Pine Ridge District School Board
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111:Learn how and when to remove this message
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390:American Society of Mechanical Engineers
386:Historic Mechanical Engineering Landmark
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137:Front view of the Peterborough Lift Lock
479:to see existing examples in operation.
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563:Canadian Register of Historic Places
49:adding citations to reliable sources
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1355:Transport in Peterborough, Ontario
1330:National Historic Sites in Ontario
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319:Peterborough Lift Lock (side view)
272:19.8 metres (65 ft 0 in)
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701:. Industry Canada. Archived from
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1160:Cathedral of St. Peter-in-Chains
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735:Lock 21 - Peterborough Lift Lock
283:National Historic Site of Canada
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36:needs additional citations for
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455:The lift lock was designed by
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1340:Transport museums in Ontario
1130:Peterborough Memorial Centre
730:Peterborough Lift Lock views
467:). In 1896, he travelled to
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1140:Petroglyphs Provincial Park
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631:"Peterborough Lift Lock"
60:"Peterborough Lift Lock"
1063:Richard Birdsall Rogers
495:Dominion Bridge Company
457:Richard Birdsall Rogers
373:Residents and visitors
256:43 metres (141 ft)
1155:Peterborough City Hall
1115:Peterborough Lift Lock
666:. Pro-Talk. 2004-09-03
558:Peterborough Lift Lock
539:. Government of Canada
382:National Historic Site
333:Peterborough Lift Lock
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264:10 metres (33 ft)
126:Peterborough Lift Lock
1094:Trent–Severn Waterway
1012:Peterborough, Ontario
887:Northwest Territories
465:Trent-Severn Waterway
399:, at its summit near
357:Trent-Severn Waterway
345:Peterborough, Ontario
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185:Trent-Severn Waterway
165:44.30750°N 78.30083°W
1263:Peterborough Transit
1032:Notable Peterborians
849:Prince Edward Island
45:improve this article
1294:Peterborough Lakers
1048:Samuel de Champlain
397:Kirkfield Lift Lock
170:44.30750; -78.30083
161: /
1289:Peterborough Petes
1089:Oak Ridges Moraine
945:History portal
508:List of boat lifts
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212:Maintained by
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34:This article
32:
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23:
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1150:Warsaw Caves
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871:Saskatchewan
707:. Retrieved
703:the original
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668:. Retrieved
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639:the original
606:. Retrieved
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216:Parks Canada
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43:Please help
38:verification
35:
18:
1258:Highway 115
1120:Market Hall
968:WikiProject
880:Territories
864:Quebec City
812:Nova Scotia
774:by location
461:Trent Canal
341:Trent Canal
168: /
1315:Boat lifts
1309:Categories
709:2009-09-21
670:2009-09-21
645:2009-09-21
587:2009-01-19
519:References
513:Canal lock
290:Designated
156:78°18′03″W
153:44°18′27″N
101:April 2022
71:newspapers
1205:Education
1108:Landmarks
1072:Geography
780:Provinces
581:Landmarks
401:Kirkfield
392:in 1987.
364:hydraulic
351:, and is
337:boat lift
225:Hydraulic
222:Operation
204:Southern
16:Boat lift
932:Category
859:Montreal
827:Kingston
822:Hamilton
797:Manitoba
502:See also
413:caissons
201:Province
181:Waterway
1169:Economy
892:Nunavut
842:Toronto
832:Niagara
817:Ontario
787:Alberta
608:29 July
543:29 July
477:England
473:Belgium
451:History
444:Siemens
435:gravity
417:reaches
388:by the
355:on the
353:Lock 21
235: (
206:Ontario
191:Country
85:scholar
1277:Sports
1020:People
913:France
854:Quebec
837:Ottawa
469:France
349:Canada
253:Length
195:Canada
87:
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897:Yukon
375:skate
335:is a
261:Width
248:1980s
92:JSTOR
78:books
1027:Flag
610:2018
545:2018
475:and
331:The
293:1979
269:Fall
237:1904
233:1904
64:news
566:.
424:ram
47:by
1311::
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618:^
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99:(
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