The Kirkfield Lift Lock is not a bridge, however this impressive structure that has two structures that physically raise and lower to move boats through a change in elevation on the Trent-Severn Waterway has a number of features similar to and of interest to bridge enthusiasts. The lock structures that raise and lower utilize a riveted pony truss design to bear the load of the water they contain. There are also trussed towers next to the locks that resemble the towers used on vertical lift bridges The steel on the lift lock towers is also noteworthy since it also contains a couple interesting and very well-preserved and visible British steel brands. British steel is exceedingly rare in North America, but can be found on a small number of surviving Canadian heritage bridges, and obviously was used on this lift lock as well.
This lift lock has been the victim of substantial alteration from the original design. Most significant is the structure that includes an overpass over Kirkfield Road was completely demolished and replaced in 1969.
The photo gallery for this structure has photos of some of the interpretive signage around the lift lock. Consult these images for details on how the lift lock works. In short, the two locks and the water they hold balance and counterweight each other. Small changes in the amount of water in one lock will cause one lock to lift and at the same time lower the other lock.
This lift lock is one of two on the Trent-Severn Canal. The other one in Peterborough is older, larger, and less altered, however note that it lacks the trussed towers and uses concrete instead.
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.
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