Mattawa – Advanced and Historic Data
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About this data
Average daily flow is measured in cubic metres per second (m3/s).
Water level is measured in metres according to the geodetic reference above mean sea level and is either the level measured at 24:00 (midnight) or the daily average.
The median is used to represent the long-term average value.
The normal range, identified with the light green band on the figure, is where observed levels or flows occur 50% of the time.
Hourly level and flow data values are the instantaneous measurement for the given time.
The data provided by this web service may not be reproduced or redistributed.
Contact the Ottawa River Regulation Secretariat for information on how to obtain historical data directly from the data owner.
Users of the flow and water level data, and hydrological forecasts shown on this website must recognize that such information is considered preliminary data. Users must therefore accept that the information provided carries an unspecified level of uncertainty and are advised to be cautious if they intend to use the information for decision-making. Please see the Disclaimer for further details.
The flow rates and actual levels can change rapidly without warning, particularly during the freshet period. We advise those using bodies of water to exercise caution and to always follow established safety guidelines when near water.