This image shows the main administrative building for the entrance to the Blue Water Bridge, located between Point Edward, Ontario and Port Huron, Michigan.
The Photogelatine Engraving Co., Limited, Ottawa
There is no description on the back of this card. The legend on the front states:
Driveway Entrance to Blue Water International Bridge, Sarnia, Ontario, Canada.
–The Blue Water Bridge is a now dual span bridge that was completed in 1938, with the second bridge being built alongside in 1997.
This image likely dates from the 1940s.