It is built next to the control dam on the backchannel as the Rideau River splits around Long Island .
Watson 's Mill is situated on the banks of the Rideau River , in the village of Manotick , Ontario .
Watson 's Mill is built next to the control dam on the backchannel as the Rideau River splits around Long Island .
Watson 's Mill is situated on the banks of the Rideau River , in the village of Manotick , Ontario .