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Ontario Power Generation (OPG) operates 66 hydroelectric stations and 240 dams on 24 river systems.
OPG tracks water levels and flows with water level gauges at stations and dams across our hydro operations. This information is available to the public and can be accessed with the links below.
We also collect data on snow depth and water content. Here is the most recent snow survey information.
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Please be sure to 'refresh' (CTRL-R or F5) this page to ensure you receive the most recent data.
Eastern Ontario
Madawaska River
Mississippi River
Ottawa River
Central Ontario
Beaver River
Muskoka River
Severn River
Northeast Ontario
Abitibi River
Matabitchuan River
Mattagami River
- Mesomikenda Lake (PDF)
- Mattagami Lake (PDF)
- Peterlong Lake (PDF)
- Wawaitin GS / Kenogamissi Lake (PDF)
- Sandy Falls GS (PDF)
- Lower Sturgeon GS (PDF)
- Horwood Lake (PDF)
- Little Long GS (PDF)
Montreal River
South River
Sturgeon River
Wanapitei River
Northwest Ontario
Aguasabon River
Kaministiquia River
- Dog Lake (PDF)
- Dog Lake Outflow (PDF)
- Upper Kaministiquia River at Hydroline (PDF)
- Greenwater Lake (PDF)
- Kashabowie Lake (PDF)
- Shebandowan Lake (PDF)
- Kakabeka Falls GS (PDF)
- Kaministiquia River 5-Year (PDF)
Nipigon River
- Waboose Diverson Dam (PDF)
- Ogoki Reservoir (PDF)
- Summit Control Dam (PDF)
- Lake Nipigon (PDF)
- Pine Portage GS (PDF)
- Cameron Falls GS (PDF)
- Alexander GS (PDF)
Please be sure to 'refresh' (CTRL-R or F5) this page to ensure you receive the most recent data.
The data files on this page are typically updated every weekday.
- Information for the English River and Winnipeg River is available from the Lake of the Woods Control Board.
- Information for the St. Lawrence River is available from the International Lake Ontario - St. Lawrence River Board.
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