| Beaver River | |
| Pushpin Map: | Canada Southern Ontario |
| Pushpin Map Caption: | Location of the mouth of the Beaver River in southern Ontario |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Ontario |
| Subdivision Type3: | Region |
| Subdivision Name3: | Southern Ontario |
| Subdivision Type4: | Counties |
| Source1: | field |
| Source1 Location: | Clearview, Simcoe County |
| Source1 Coordinates: | 44.3914°N -80.2575°W |
| Source1 Elevation: | 513m (1,683feet) |
| Mouth: | Georgian Bay on Lake Huron |
| Mouth Location: | The Blue Mountains, Grey County |
| Mouth Coordinates: | 44.565°N -80.4478°W |
| Mouth Elevation: | 176m (577feet) |
| River System: | Great Lakes Basin |
| Tributaries Left: | Boyne River, Little Beaver River |
The Beaver River is a river in Grey County and Simcoe County in Southern Ontario, Canada.[1] It is part of the Great Lakes Basin, and is a tributary of Lake Huron. The river's drainage basin is under the auspices of Grey Sauble Conservation.[2]
The river begins in a field in Clearview, Simcoe County, and flows west immediately into Grey Highlands, Grey County. The river continues southwest, takes in the left tributary Little Beaver River, and heads into Eugenia Lake at the edge of the Niagara Escarpment at the community of Eugenia; the lake was formed when the river was regulated for flow control and a hydroelectric plant was built. It continues over the Eugenia Falls and takes in the left tributary Boyne River, and turns north, flowing through Beaver Valley into the municipality of The Blue Mountains. The river then heads north, passes over two dams and reaches its mouth at Nottawasaga Bay on Georgian Bay, Lake Huron, at the community of Thornbury.
A fish ladder near Thornbury allows fish to reach spawning areas up river.
The river is also a popular recreational canoe route. The Beaver River valley is home to the Beaver Valley Ski Club.