Great Slave Lake at Yellowknife Bay
Water level and flow at gauge 07SB001, Northwest Territories. The level is normal for October. In the last 24 hours it has been rising.
Latest reading Oct 25, 6 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 86 years of monthly averages): 156.45 m513.30 ft – 156.71 m514.12 ft, median 156.55 m513.61 ft.
September 7, 2020 · approved records 1978–2025 (HYDAT). Right now the level is 0.85 m2.80 ft below that record.
0.42 m1.39 ft higher than on October 25, 2025 (156.11 m512.17 ft)
approved daily mean (HYDAT)
Last 30 days
Hourly readings · shaded: normal range for this month
This year compared with past years
Daily water level
Normal range: monthly averages of 82 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
A mix of sun and cloud. Clearing late this afternoon. Wind becoming south 20 km/h gusting to 40 near noon. High plus 2. Wind chill minus 13 this morning.
Clear. Becoming partly cloudy this evening. Wind south 20 km/h gusting to 40. Low minus 1.
Sunny. Wind southwest 20 km/h gusting to 40 becoming light in the afternoon. High plus 1. Wind chill minus 7 in the morning. UV index 1 or low.
Clear. Low minus 7.
Forecast for Yellowknife (1 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Baker CreekOutlet of Lower Martin Lake · 9 km | 28.95 m94.96 ft | Below normal |
| Yellowknife RiverOutlet of Prosperous Lake · 15 km | — | Below normal |
| Prosperous LakeMcMeekan Bay · 15 km | 158.11 m518.75 ft | Below normal |
| Prelude LakeYellowknife · 25 km | 169.03 m554.57 ft | Below normal |
| Yellowknife RiverInlet To Prosperous Lake · 26 km | 152.77 m501.20 ft | Below normal |
| Bluefish LakeYellowknife · 27 km | 185.76 m609.44 ft | Normal |
About this gauge
Station: 07SB001 · Great Slave Lake at Yellowknife Bay
Location: 62.4416, -114.3498 · Northwest Territories
Same lake: Hay River, Outlet of Barnston River
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 Great Slave Lake at Yellowknife Bay today?
The latest reading (Oct 25, 6 AM, local standard time) is 156.53 m (513.56 ft).
Is the Great Slave Lake at Yellowknife Bay high right now?
The level is normal for October.
Is the Great Slave Lake rising or falling?
In the last 24 hours it has been rising.
What is the highest water level ever recorded on the Great Slave Lake at Yellowknife Bay?
157.38 m (516.35 ft) on September 7, 2020, the highest instantaneous level in the approved records of the Water Survey of Canada (1978–2025). Events after 2025 are not yet in the approved archive.
How does the Great Slave Lake at Yellowknife Bay compare with a year ago?
The level is 0.42 m (1.39 ft) higher than on October 25, 2025 (156.11 m (512.17 ft), approved daily mean (HYDAT)).
Where does this data come from?
Gauge 07SB001 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.