Water Survey of Canada by Environment Canada
The Water Survey of Canada (WSC) is the national authority responsible for the collection, interpretation and dissemination of standardized water resource data and information in Canada. In partnership with the provinces, territories and other agencies, WSC operates over 2800 active hydrometric gauges across the country.
Environment Canada's WSC includes: HYDAT - Canada's national archive for water quantity data.
Real-Time Hydrometric Data - Maps of hydrometric stations. Water Level and Stream flow Statistics - selected hydrometric station.