Ganaraska River at Osaca
Water level and flow at gauge 02HD003, Ontario. The flow is well below normal for October (77% 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 68 years of monthly averages): 0.82 m³/s28.9 cfs – 1.03 m³/s36.5 cfs, median 0.91 m³/s32.2 cfs. Right now it is at 77% of the median.
March 12, 1990 · approved records 1968–2025 (HYDAT). Right now the flow is 1% of that record.
4% lower than on October 25, 2025 (0.74 m³/s26.1 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 57 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
Mainly sunny. Fog patches dissipating this morning. High 16. UV index 3 or moderate.
Clear. Becoming partly cloudy this evening. Low 9.
Cloudy. 30 percent chance of showers in the morning and early in the afternoon. High 15. UV index 2 or low.
Cloudy periods. Low minus 3.
Forecast for Cobourg (23 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| North West Ganaraska RiverOsaca · 0 km | 2.48 m8.12 ft | Very low |
| Ganaraska RiverAbove Dale · 9 km | 0.95 m3.11 ft | Very low |
| Baxter CreekMillbrook · 15 km | 2.42 m7.94 ft | Below normal |
| Wilmot CreekLeskard · 16 km | 1.15 m3.76 ft | Normal |
| Wilmot CreekNewcastle · 17 km | 3.52 m11.54 ft | Below normal |
| Cobourg BrookPrecious Corners · 18 km | 2.26 m7.41 ft | Very high |
About this gauge
Station: 02HD003 · Ganaraska River Near Osaca
Location: 44.0151, -78.4375 · Ontario
Same river: Above Dale
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 Ganaraska River at Osaca today?
The latest reading (Oct 25, 8 AM, local standard time) is 0.37 m (1.20 ft) with a flow of 0.71 m³/s (25.0 cfs).
Is the Ganaraska River at Osaca high right now?
The flow is well below normal for October (77% of the median).
Is the Ganaraska River rising or falling?
In the last 24 hours it has been steady.
What is the highest flow ever recorded on the Ganaraska River at Osaca?
51.7 m³/s (1,826 cfs) on March 12, 1990, the highest instantaneous flow in the approved records of the Water Survey of Canada (1968–2025). Events after 2025 are not yet in the approved archive.
How does the Ganaraska River at Osaca compare with a year ago?
The flow is 4% lower than on October 25, 2025 (0.74 m³/s (26.1 cfs), approved daily mean (HYDAT)).
Where does this data come from?
Gauge 02HD003 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.