The Queen Street Viaduct (usually known as the Queen Street Bridge) in Toronto, carries traffic across the Don River. The Steel Truss bridge was built in 1911 to replace an early stone bridge over the river.
At the top of the western side of the bridge is a piece of public art created in 1996 by Eldon Garnet. It consisted of a clock, which ceased to work and the mechanism and hands were removed in 2010, with the phrase: "This river I step in is not the river I stand in".
I think this should mean that the time is marching on, as the water is flowing.