Well guys...
I drove up to Bate Island tonight at 18:00, braving the nocturnal local fauna with a flashlight in my hand.
There is a strong correlation with the water level upstream, at Britannia, and the waves at Bate Island. But somehow these waves seem to depend on the level downstream, as determined by the various dams at Chaudi?re falls.
I turns out that even though the level is almost 59 m on the upstream gauge, there is unfortunately not much to surf at Bate island right now.
The trend is fortunately upwards, so let's hope that it gets better! A part of the Rauch family will be our scouts tomorrow morning, so we should know for sure!
--C.