Four bridges together

This rather mucky Ektachrome colourslide shows four bridges crossing a stretch of water. The two middle bridges, a road bridge and a foot bridge, don’t seem to be being used, so I guess the newer looking bridge to the left was built to replace it. There certainly seems to be traffic flowing on that bridge. The steel construction bridge to the right is presumably a rail bridge.

The date and location is unknown but the cars seem to date from the 1950s. Anyone know the location?