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Twyn Rivers Drive is a very scenic road that winds through Glen Rouge Park in far eastern Toronto. When driving the road, the driver is instantly transported from a suburban environment into a natural setting that feels like it is miles away from Toronto. One of the most unique aspects of the drive is that it crosses two rivers, the Rouge River and Little Rouge River, and each crossing is a heritage bridge. Even more interesting, each bridge is a completely different structure type. The Rouge River crossing is a metal truss bridge, while the Little Rouge River crossing is a concrete bowstring through arch (rainbow arch) type bridge. This contrast of bridge types within a short distance from each other makes for a very unique setting.
This bridge is a small, but well-preserved example of a concrete bowstring through arch, sometimes called a rainbow arch type of bridge. Based on the railing design of the bridge as well as the lack of inset rectangular panels on the arch, this bridge appears to be an example of the earlier design of this bridge type that was built in Ontario. This structure type may have once been common, and although a number of examples survive scattered throughout the province, this structure type should be considered rare today. Surviving examples with good integrity, like this bridge, are significant as examples of this aesthetically pleasing and unusual bridge type.
The bridge contributes in a positive manner to the scenic Twyn Rivers Drive and surrounding park, and is part of a heritage bridge group with the nearby metal truss bridge. Given what appears to be a largely recreational role of Twyn Rivers Road, the narrow two lane bridge appears to be sufficient for the needs and use of the roadway. The bridge should be maintained and preserved in place for continued light vehicular use.
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