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River system data

Ontario Power Generation operates 66 hydroelectric stations, including a green power portfolio of 29 small hydroelectric plants, and 241 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.


Eastern Ontario

Madawaska River
Mississippi River
Ottawa River

Central Ontario

Beaver River
Muskoka River
Severn River

Northeast Ontario

Abitibi River
Matabitchuan River
Mattagami River
Montreal River
South River
Sturgeon River
Wanapitei River

Northwest Ontario

Aguasabon River
Kaministiquia River
Nipigon River

This data is typically updated every Thursday although during the spring, some river system data is updated more regularly.