| James Lake | |
| Coords: | 47.1788°N -79.7374°W |
| Type: | natural freshwater lake with acidic water in part of it |
| Pushpin Map: | Ontario |
| Basin Countries: | Canada |
| Length: | 2.25km (01.4miles) |
| Width: | 0.36km (00.22miles) |
James Lake is a lake in northeastern Ontario, Canada, located in the Temagami region along Highway 11.
Water levels of James Lake increased and decreased in the early 1900s.[1] The cause of this alternation could have been caused by beavers building dams in the lake's outlet, eventually causing the water levels in rise.[1] This rise in water levels began to cease in 1906 when operations of Northland Pyrite Mine on the lake's southwestern shore dumped waste rock into the lake.[1] Erosion of the waste rock resulted in the development of acidic lake waste waters next to the waste pile, causing neighboring organisms to disappear.[1]