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| Lock #21 via Dennis DeBruler 36.6m (120') x 9.7m (32') x 19.8m (65') Opened on July 9, 1904, it is the highest hydraulic lift lock in the world, 65' (20m). |
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| Street View, Oct 2021 |
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| Rick Stout posted Lock of Love: The Trent Severn is made up of forty-four locks in total however some are not traditional locks. The Marine Railway at Big Chute Ontario is classed as Lock 44 however it is a marine railway carriage that can take a 100 ft and 100 ton boat from the lower Gloucester Pool up a 78 ft grade to the upper Severn River and re-launch it. As most are traditional locks, four of which are double flight locks 11&12 at Campbellford Ont and 16 &17 at Healey Falls Ont. there is also two hydraulic lift locks and they are Lock 36 at Kirkfield Ont. and Lock 21 at Peterborough. The Peterborough Hydraulic Lift Lock opened in 1904 and it works as two side by side tubs that lift water and boats to the next level. When one tub rises and the top gate opens, the water level rises by 12" in the tub. At the same time the opposite tub is at the lower level and as that gate opens, the water drops 12". This makes one tub heavier then the other. When the transfer valve is opened, the heavier tub begins to drop while the lighter tub rises. After the boats in the lock depart, the gate is closed and the process is revesed. The system was originally built to float timber through the system. Jim Dean: I believe the Peterborough lift lock is the highest of its' kind in the world and the structure has no re-bars imbedded in its' concrete. Paul Ingram: Jim Dean The Liftlock is the largest un-reinforced ( no rebar ) concrete pour in the world. Peterborough also has the largest unreinforced concrete bridge ( the Hunter Street Bridge ). The Kirkfield Liftlock has a steel frame rather than concrete. |
Portland Cement In The Trent-Severn Canal Lift Locks
Gord Young, Editor for Lakefield Heritage Research provided the following detailed discussion which explains why the Kirkfield Lift Lock has the trussed steel towers instead of concrete, and the significance of the Portland Cement that was used in the Peterborough Lift Lock.
The Peterborough Lift Lock is the largest and tallest compressed Portland cement structure in the world. We know this, because test walls created at the Lakefield Portland Cement Company's former property have the highest density Portland cement recorded. Kirkfield Lift Lock on the other hand had to substitute a steel cage using the same shape as that at Peterborough, only because Rogers and later, Grant who replaced Rogers, could not get adequate "on-time" deliveries of the Lakefield Portland Cement Company. Something was wrong with the materials coming out of a Portland cement plant that was created near Kirkfield to try to alleviate the problem. Nothing worked for Grant. He threw up his hands and built the steel-caging instead. The design for Peterborough and Kirkfield was based on the Peavey-Haglin grain elevator in St. Paul MN. Only two things changed from the grain elevator to the lift locks. The concrete forms were squared, and, the Portland cement was compressed after being poured. Haglin's grain elevator was a simple Portland pour. Both lift locks and the grain elevator used the same principle of pour a form and then jack-up the form when the lower-half was nearly set. Rogers had a certain amount of Portland cement poured into the form, then had it tamped until it was nearly dry, poured more, tamped, poured more, tamped, then when full, began jacking up the form. Now that the outer slathing-parging has peeled off, you can see the ridges of the pouring forms.
[HistoricBridges]
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| CottageLife, PHOTO BY JUSTEN SOULE, COURTESY OF PARKS CANADA (source) Calling all paddlers! Pile into the historic Peterborough Lift Lock [Aug 26, 2023] "It was built from 1896 to 1904 on the Otonabee River section of the Trent-Severn Canal and was designated a national heritage site in 1979 due to its massive size. At a height of 20 metres [66'], it is the largest hydraulic lift in the world that is still in regular operation, according to Canada’s Directory of Federal Heritage Designations." |
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| Maurie MacDonald posted Locks of Love .. closeup at a Trent-Severn Lock from aboard.. 2022 [I presume this photo is of this lock.] |
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| TalesFromTheAmericanWaterways-2 via Dennis DeBruler, one of four photos of the Peterborough Lift Lock "Two adjacent holding tanks simultaneously move in opposite directions, to take boats up and down the lock. No electric power is used and the lock works simply by the weight of water in the upper tank being greater than that of the lower one. The lift is 65 ft – at the time it was built, in 1904, it was the largest structure in the world to be built from unreinforced concrete. It is very quick too – the ascent took only a couple of minutes." |
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| 1:16 video |
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