Lake Diefenbaker

Normal

Water level is right where you'd expect for mid-September and rising.

This is a controlled waterbody (reservoir or regulated lake). Water levels may be managed by dam operations and may not follow natural seasonal patterns.

Low (524.45m)Normal rangeHigh (556.82m)

Current Weather

2d ago

19°C

Wind SSE 23 km/h

Humidity 56%

Mainly sunny

Environment Canada — Outlook - Watrous - Hanley - Imperial - Dinsmore

vs. Last Year

No data available

7-Day Trend

↑Rising

Up 8.1 cm over the past week

+8.1 cm over 7 days

Seasonal Position

41st percentile

Based on 60 years of records

Seasonal Outlook

Typical next 7 days

This lake usually drops slightly 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 59 years of seasonal patterns. This is a historical seasonal pattern, not a forecast.

Lake Profile

Est. average depth25.2 m

Estimated from HydroLAKES v1.0 (Messager et al., 2016). Modeled geo-statistical estimate, not a direct survey measurement.

Water Level — Last 30 Days

Technical details

Current level: 555.50 m
Reference value: 555.50 m (rolling_6h_mean)
Percentile for date: 41st percentile
Years of record: 60
Source station: LAKE DIEFENBAKER AT GARDINER DAM (05HF003)
Est. average depth: 25.2 m
Relationship type: controlled_system
Mapping confidence: medium
Today's normal range: 554.76–556.32 m
Same-date historical range: 524.45–556.82 m
30-day change: +1.2 cm
Data confidence: medium
Observed at: Sep 20, 2026
Last snapshot: Sep 20, 2026

Data source: ECCC Water Office — Station 05HF003. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.