| Opataouaga Lake | |
|---|---|
 Watershed of Broadback River | |
  Opataouaga Lake | |
| Location | Eeyou Istchee Baie-James (municipality) (RCM) |
| Coordinates | 50°21′59″N 76°42′01″W / 50.36639°N 76.70028°W |
| Type | Natural |
| Primary inflows | Lake Poncheville and few forested creek |
| Primary outflows | Quénonisca Lake |
| Basin countries | Canada |
| Max. length | 13.0 kilometres (8.1 mi) |
| Max. width | 5.3 kilometres (3.3 mi) |
| Surface area | 27.54 kilometres (17.11 mi) |
| Surface elevation | 269 metres (883 ft) |
Opataouaga Lake is a freshwater body of the Broadback River hydrographic slope of the municipality of Eeyou Istchee James Bay (municipality), in the administrative region of Nord-du-Québec, in Quebec, in Canada.
Forestry is the main economic activity of the sector. Recreational tourism activities come second with a large navigable body of water upstream of Lake Poncheville, and downstream Quénonisca Lake and the Broadback River.
The hydrographic slope of lake Opataouaga is accessible through the forest road R1023 (East-West direction) coming from the West and passing north of “Île au Pain de Sucre” (English: Sugarloaf Island); the R1023 connects the "James Bay Road" (North-South direction) that comes from Matagami; from “Île au Pain de Sucre”, this road heads north-east to the west side of Lac Rocher.
The surface of Opataouaga Lake is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.