Grand River at Dundalk
Water level and flow at gauge 02GA041, Ontario. The flow is normal for October (39% of the median). In the last 24 hours it has been rising.
Latest reading Oct 25, 11 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 37 years of monthly averages): 0.04 m³/s1.34 cfs – 0.66 m³/s23.3 cfs, median 0.16 m³/s5.58 cfs. Right now it is at 39% of the median.
February 12, 2009 · approved records 1986–2024 (HYDAT). Right now the flow is 0% of that record.
158% higher than on October 25, 2025 (0.02 m³/s0.85 cfs)
approved daily mean (HYDAT)
Last 30 days
Hourly readings · shaded: normal range for this month
This year compared with past years
Daily flow
Normal range: monthly averages of 35 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
Sunny. Becoming a mix of sun and cloud this afternoon. Wind southwest 20 km/h. High 17. UV index 3 or moderate.
Partly cloudy. Low 8.
Mainly cloudy. 30 percent chance of showers in the morning. Wind north 20 km/h becoming light late in the morning. High 12. UV index 3 or moderate.
Clear. Low minus 2.
Forecast for Dundalk (4 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Beaver RiverVandeleur · 27 km | 7.12 m23.37 ft | Very low |
| Mad RiverAvening · 30 km | 1.02 m3.34 ft | Below normal |
| Beatty Saugeen RiverHolstein · 31 km | 1.69 m5.55 ft | Very low |
| Grand RiverMarsville · 32 km | 3.30 m10.81 ft | Below normal |
| Pine RiverEverett · 33 km | -0.03 m-0.10 ft | Very low |
| Nottawasaga RiverHockley · 34 km | 0.67 m2.20 ft | Below normal |
About this gauge
Station: 02GA041 · Grand River Near Dundalk
Location: 44.1400, -80.3627 · Ontario
Same river: Galt, Marsville, Below Shand Dam, West Montrose, Doon, Brantford
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 Grand River at Dundalk today?
The latest reading (Oct 25, 11 AM, local standard time) is 1.29 m (4.22 ft) with a flow of 0.06 m³/s (2.19 cfs).
Is the Grand River at Dundalk high right now?
The flow is normal for October (39% of the median).
Is the Grand River rising or falling?
In the last 24 hours it has been rising.
What is the highest flow ever recorded on the Grand River at Dundalk?
40.4 m³/s (1,427 cfs) on February 12, 2009, 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.
How does the Grand River at Dundalk compare with a year ago?
The flow is 158% higher than on October 25, 2025 (0.02 m³/s (0.85 cfs), approved daily mean (HYDAT)).
Where does this data come from?
Gauge 02GA041 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.