Mattawishkwia River at Hearst
Water level and flow at gauge 04LK001, Ontario. The flow is normal for October (48% of the median). In the last 24 hours it has been steady.
Latest reading Oct 25, 8 AM local standard time (2 hours ago) · data checked · we check every 30 minutes
Compared with a normal October
Normal for October (middle half of 26 years of monthly averages): 4.59 m³/s162 cfs – 21.2 m³/s750 cfs, median 9.89 m³/s349 cfs. Right now it is at 48% of the median.
May 13, 1992 · approved records 1986–2024 (HYDAT). Right now the flow is 1% of that record.
Last 30 days
Hourly readings · shaded: normal range for this month
This year compared with past years
Daily flow
Normal range: monthly averages of 27 years (lighter band: 10th–90th percentile). Past years: approved daily means from HYDAT, the Water Survey of Canada archive (the latest year published is 2025). 2026: daily means of the provisional real-time readings collected by Canada River Levels since October 22, 2026.
Weather near this gauge
A few showers ending this morning then clearing. Wind southwest 30 km/h gusting to 50. High 19. UV index 2 or low.
Increasing cloudiness early this evening. Wind northwest 20 km/h gusting to 40 becoming light after midnight. Low minus 2.
Overcast. Wind north 20 km/h becoming light late in the morning. High plus 2. Wind chill minus 8 in the morning. UV index 1 or low.
Clear. Low minus 9.
Forecast for Hearst (19 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Missinaibi RiverMattice · 29 km | 0.34 m1.11 ft | Below normal |
| Nagagami RiverHighway No. 11 · 64 km | 1.38 m4.52 ft | Very low |
| Kapuskasing RiverKapuskasing · 93 km | 4.57 m14.99 ft | Below normal |
| Kenogami RiverMammamattawa · 97 km | 20.14 m66.07 ft | Very low |
| Pagwachuan RiverHighway No. 11 · 113 km | 9.53 m31.26 ft | Very low |
| Groundhog RiverFauquier · 124 km | 29.38 m96.39 ft | Below normal |
About this gauge
Station: 04LK001 · Mattawishkwia River at Hearst
Location: 49.6828, -83.6568 · Ontario
Water levels are measured from a local reference point at each gauge, not from sea level, so they cannot be compared between gauges.
Official sources
For flood warnings, advisories and approved data, always use these official services:
Questions
What is the water level of the Mattawishkwia River at Hearst today?
The latest reading (Oct 25, 8 AM, local standard time) is 4.92 m (16.13 ft) with a flow of 4.76 m³/s (168 cfs).
Is the Mattawishkwia River at Hearst high right now?
The flow is normal for October (48% of the median).
Is the Mattawishkwia River rising or falling?
In the last 24 hours it has been steady.
What is the highest flow ever recorded on the Mattawishkwia River at Hearst?
326 m³/s (11,513 cfs) on May 13, 1992, the highest instantaneous flow in the approved records of the Water Survey of Canada (1986–2024). Events after 2024 are not yet in the approved archive.
Where does this data come from?
Gauge 04LK001 of the Water Survey of Canada (Environment and Climate Change Canada). Real-time data are provisional and may be revised. We check for new readings every 30 minutes. Canada River Levels is not an official source.