The posted co-ordinates are not of the dam, but an area where you can park and observe the dam. Please keep back from the water as it can be quite treacherous here!
You can also see Ring-billed Gulls here.
There is a suspension bridge over the outflow, and a tunnel under the lock as well.
The dam provides 1755MW of power, on the south side of the St Lawrence Seaway.
More info: (
visit link)