Speed River at Armstrong Mills
Water level and flow at gauge 02GA040, Ontario. The flow is well below normal for October (33% of the median). In the last 24 hours it has been steady.
Latest reading Oct 25, 7 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 50 years of monthly averages): 0.44 m³/s15.7 cfs – 1.56 m³/s55.2 cfs, median 0.80 m³/s28.4 cfs. Right now it is at 33% of the median.
May 17, 1974 · approved records 1974–2025 (HYDAT). Right now the flow is 0% of that record.
20% lower than on October 25, 2025 (0.33 m³/s11.8 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 49 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. Fog patches dissipating this morning. Wind becoming southwest 20 km/h this afternoon. High 18. UV index 4 or moderate.
Partly cloudy. Low 7.
Cloudy. Wind becoming northwest 20 km/h late in the morning. High 16. UV index 3 or moderate.
Cloudy. Low minus 2.
Forecast for Guelph (11 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Grand RiverBelow Shand Dam · 12 km | 1.55 m5.07 ft | Below normal |
| Speed RiverBelow Guelph · 12 km | 0.60 m1.97 ft | Normal |
| Eramosa RiverAbove Guelph · 12 km | 8.59 m28.17 ft | Normal |
| Blue Springs CreekEden Mills · 15 km | 1.75 m5.74 ft | Below normal |
| Irvine RiverSalem · 15 km | 1.70 m5.57 ft | Very low |
| Grand RiverWest Montrose · 18 km | 11.10 m36.40 ft | Very low |
About this gauge
Station: 02GA040 · Speed River Near Armstrong Mills
Location: 43.6386, -80.2700 · Ontario
Same river: Below Guelph, Cambridge
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 Speed River at Armstrong Mills today?
The latest reading (Oct 25, 7 AM, local standard time) is 1.04 m (3.40 ft) with a flow of 0.27 m³/s (9.43 cfs).
Is the Speed River at Armstrong Mills high right now?
The flow is well below normal for October (33% of the median).
Is the Speed River rising or falling?
In the last 24 hours it has been steady.
What is the highest flow ever recorded on the Speed River at Armstrong Mills?
114 m³/s (4,026 cfs) on May 17, 1974, the highest instantaneous flow in the approved records of the Water Survey of Canada (1974–2025). Events after 2025 are not yet in the approved archive.
How does the Speed River at Armstrong Mills compare with a year ago?
The flow is 20% lower than on October 25, 2025 (0.33 m³/s (11.8 cfs), approved daily mean (HYDAT)).
Where does this data come from?
Gauge 02GA040 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.