Black Rapids Lock - Rideau Canal Lock #13
This is the last lock on the canal that is located within the Rideau River. The next upstream lock is at the Hog's Back Falls where the 100% man-made section of the canal that runs through Ottawa starts. The shot was taken in late October when the fall colours were at their prime.
The Rideau Canal is a UNESCO World Heritage Site.
The Dominion Observatory was opened in 1905 (an closed in 1970). It was primarily established to produced more accurate time readings. As a bit of a contrast, we see an ancient time-piece, a sundial in the foreground on the left of this image.
The vintage nature of this image works well as a monochrome image.