The river continues northwest and passes into Wahta Mohawk Territory, flows over the Island Portage Falls, takes in the right tributary Haggart Creek,[6] and passes into the municipality of Georgian Bay.

Crown land camping occurs at sites along the river, and below Moon Falls.

Marc Garneau, Minister of Transport Canada, issued an interim order on April 30, 2019 prohibiting all non-emergency vessels from Moon River due to flooding.

[12] On that day Moon River was discharging at the rate of up to 361 m³/s, a flow sufficient to fill up an Olympic size swimming pool in under seven seconds.

Regular regulated summer time discharge rate of Moon River is approximately 5 m³/s.