Great Slave Lake
NormalWater level is right where you'd expect for mid-September and rising.
Low (156.09m)Normal rangeHigh (157.26m)
Current Weather
2d ago14°CPartly Cloudy
Wind SSE 19 km/h
Humidity 71%
Mainly sunny
Environment Canada — Yellowknife Region
vs. Last Year
No data available
7-Day Trend
↑Rising
Up 2.2 cm over the past week
+2.2 cm over 7 days
Seasonal Position
45th percentile
Based on 88 years of records
Seasonal Outlook
Typical next 7 days
This lake usually drops moderately over the next week.
Typical next 14 days
Over two weeks, levels typically drops moderately.
Tracking
This year is moving faster than usual.
Based on 88 years of seasonal patterns. This is a historical seasonal pattern, not a forecast.
Water Level — Last 30 Days
Technical details
- Current level
- 156.64 m
- Reference value
- 156.63 m (rolling_6h_mean)
- Percentile for date
- 45th percentile
- Years of record
- 88
- Source station
- GREAT SLAVE LAKE AT YELLOWKNIFE BAY (07SB001)
- Est. average depth
- —
- Relationship type
- direct_lake
- Mapping confidence
- medium
- Today's normal range
- 156.54–156.80 m
- Same-date historical range
- 156.09–157.26 m
- 30-day change
- -3.1 cm
- Data confidence
- medium
- Observed at
- Sep 20, 2026
- Last snapshot
- Sep 20, 2026
Data source: ECCC Water Office — Station 07SB001. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.