| Mattagami River | |
| Rivière Mattagami (French) | |
| River | |
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Mattagami River at Smooth Rock Falls
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| Name origin: Ojibwe language | |
| Country | Canada |
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| Ontario | Ontario |
| Region | Northeastern Ontario |
| Districts | Cochrane, Timiskaming, Sudbury |
| Part of | James Bay drainage basin |
| Source | Mattagami Lake |
| - location | Gouin Township, Sudbury District |
| - elevation | 330 m (1,083 ft) |
| - coordinates | |
| Mouth | Moose River |
| - location | Gardiner Township, Cochrane District |
| - elevation | 48 m (157 ft) |
| - coordinates | |
| Length | 443 km (275 mi) |
| Basin | 37,000 km2 (14,286 sq mi) |
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Location of the mouth of the Mattagami River in Ontario
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The Mattagami River is a river in the James Bay drainage basin in Cochrane District, Timiskaming District and Sudbury District in Northeastern Ontario, Canada.[1][2]
The Mattagami flows 443 kilometres (275 mi) from its source at Mattagami Lake in geographic Gouin Township[3] in the Unorganized North Part of Sudbury District, on the Canadian Shield southwest of Timmins,[4] to Portage Island in geographic Gardiner Township[5] in the Unorganized North Part of Cochrane District, in the Hudson Bay Lowlands.[6] Here the Mattagami's confluence with the Missinaibi River forms the Moose River, about 100 kilometres (60 mi) from that river's tidewater outlet at James Bay.[7] The Mattagami River flows through the city of Timmins as well as the town of Smooth Rock Falls[7] and its drainage basin encompasses 37,000 square kilometres (14,000 sq mi).[4]
The Mattagami's name comes from the Ojibwe and means either "the start of water" (maadaagami) or "turbulent water" (madaagami).
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For a map showing the river course, see this reference.[2]
Where the Groundhog and Kapuskasing Rivers flow into the Mattagami, Ontario Power Generation operates the Little Long Generating Station,[8] with a dam just over 5 km in length.
Tributaries include the: