Surely the most famous bridge in Waterloo Region is the “Kissing Bridge” in West Montrose.
It’s claim to fame is that it’s the last covered bridge in Ontario. It made a lot of sense to cover a bridge this long in the days of horse and buggy travel. Like the Conestogo Bridge, this was only ever wide enough to accommodate a single car at a time.
The highway bridge built as a car alternative bridge is quite a bit out of the way for the large Old Order Mennonite population who still get around by horse and buggy in Waterloo Region (particularly Woolwich Township). I’m guessing that’s what saved this bridge long enough to become a landmark. This photo is from spring 2015.