Sydenham River at Alvinston
Water level and flow at gauge 02GG002, Ontario. The flow is below normal for October (54% of the median). In the last 24 hours it has been steady.
Latest reading Oct 25, 8 AM local standard time (about an hour ago) · data checked · we check every 30 minutes
Compared with a normal October
Normal for October (middle half of 79 years of monthly averages): 0.99 m³/s34.9 cfs – 3.83 m³/s135 cfs, median 1.67 m³/s59.0 cfs. Right now it is at 54% of the median.
July 17, 2024 · approved records 1965–2025 (HYDAT). Right now the flow is 0% of that record.
23% lower than on October 25, 2025 (1.18 m³/s41.7 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 77 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. Fog patches dissipating this morning. High 19. UV index 4 or moderate.
A few clouds. Fog patches developing overnight. Low 7.
Mainly cloudy. Fog patches dissipating in the morning. High 16. UV index 4 or moderate.
Cloudy. Low plus 2.
Forecast for Strathroy (24 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Sydenham RiverStrathroy · 23 km | 1.81 m5.95 ft | Very low |
| Bear CreekPetrolia · 23 km | 4.11 m13.50 ft | Normal |
| Sydenham RiverFlorence · 24 km | 3.06 m10.05 ft | Normal |
| Thames RiverDutton · 25 km | 3.58 m11.76 ft | Very low |
| Ausable RiverSpringbank · 31 km | 1.64 m5.38 ft | Normal |
| Thames RiverThamesville · 33 km | 10.73 m35.20 ft | Below normal |
About this gauge
Station: 02GG002 · Sydenham River Near Alvinston
Location: 42.8308, -81.8517 · Ontario
Same river: Owen Sound, Florence, Strathroy, Wallaceburg
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 Sydenham River at Alvinston today?
The latest reading (Oct 25, 8 AM, local standard time) is 10.51 m (34.47 ft) with a flow of 0.91 m³/s (32.1 cfs).
Is the Sydenham River at Alvinston high right now?
The flow is below normal for October (54% of the median).
Is the Sydenham River rising or falling?
In the last 24 hours it has been steady.
What is the highest flow ever recorded on the Sydenham River at Alvinston?
267 m³/s (9,429 cfs) on July 17, 2024, the highest instantaneous flow in the approved records of the Water Survey of Canada (1965–2025). Events after 2025 are not yet in the approved archive.
How does the Sydenham River at Alvinston compare with a year ago?
The flow is 23% lower than on October 25, 2025 (1.18 m³/s (41.7 cfs), approved daily mean (HYDAT)).
Where does this data come from?
Gauge 02GG002 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.