Slate River at Thunder Bay
Water level and flow at gauge 02AB023, Ontario. The flow is below normal for October (38% of the median). In the last 24 hours it has been falling.
Latest reading Oct 25, 10 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 18 years of monthly averages): 0.09 m³/s3.21 cfs – 0.39 m³/s13.7 cfs, median 0.12 m³/s4.22 cfs. Right now it is at 38% of the median.
November 29, 2016 · approved records 2007–2025 (HYDAT). Right now the flow is 0% of that record.
81% lower than on October 25, 2025 (0.24 m³/s8.55 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 18 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. Wind west 20 km/h gusting to 40. High 13. UV index 2 or low.
Clear. Wind northwest 20 km/h becoming light this evening. Low minus 2.
Mainly sunny. Wind up to 15 km/h. High 7. Wind chill minus 5 in the morning. UV index 2 or low.
Clear. Low minus 5.
Forecast for Thunder Bay (15 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Kaministiquia RiverWest Fort William · 4 km | 183.11 m600.75 ft | Below normal |
| Neebing RiverThunder Bay · 10 km | 184.41 m605.02 ft | Normal |
| Neebing RiverIntola · 13 km | 27.16 m89.11 ft | Very low |
| Whitefish RiverStanley · 15 km | 4.04 m13.24 ft | Below normal |
| Corbett CreekMurillo · 15 km | 5.80 m19.03 ft | Above normal |
| McIntyre RiverAbove Thunder Bay · 18 km | 307.67 m1,009.41 ft | Very low |
About this gauge
Station: 02AB023 · Slate River Near Thunder Bay
Location: 48.3258, -89.4042 · 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 Slate River at Thunder Bay today?
The latest reading (Oct 25, 10 AM, local standard time) is 25.53 m (83.77 ft) with a flow of 0.05 m³/s (1.59 cfs).
Is the Slate River at Thunder Bay high right now?
The flow is below normal for October (38% of the median).
Is the Slate River rising or falling?
In the last 24 hours it has been falling.
What is the highest flow ever recorded on the Slate River at Thunder Bay?
78.7 m³/s (2,779 cfs) on November 29, 2016, the highest instantaneous flow in the approved records of the Water Survey of Canada (2007–2025). Events after 2025 are not yet in the approved archive.
How does the Slate River at Thunder Bay compare with a year ago?
The flow is 81% lower than on October 25, 2025 (0.24 m³/s (8.55 cfs), approved daily mean (HYDAT)).
Where does this data come from?
Gauge 02AB023 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.