Duncan Lake

Unusually low

Water level is well below normal for mid-September and holding steady.

Low (210.49m)Normal rangeHigh (213.35m)

Current Weather

2d ago

16°C

Wind SE 14 km/h

Humidity 50%

Mainly sunny

Environment Canada — North Slave Region including Wekweeti - Whati - Behchoko

vs. Last Year

No data available

7-Day Trend

→Stable

Changed less than 2.0 cm over the past week

0.0 cm over 7 days

Seasonal Position

0th percentile

Based on 42 years of records

Seasonal Outlook

Typical next 7 days

This lake usually holds steady over the next week.

Typical next 14 days

Over two weeks, levels typically drops slightly.

Tracking

This year is tracking near the seasonal norm.

Based on 42 years of seasonal patterns. This is a historical seasonal pattern, not a forecast.

Fish Consumption Advisories (3 species)

The following consumption advisories are in effect for fish caught in Duncan Lake.

⚠Northern Pike

Contaminant	Size	General pop.	Sensitive pop.
Mercury	45-50 cm	8/month	4/month
Mercury	50-55 cm	4/month	Do not eat
Mercury	55-60 cm	4/month	Do not eat
Mercury	60-65 cm	4/month	Do not eat
Mercury	65-70 cm	4/month	Do not eat
Mercury	70-75 cm	2/month	Do not eat
Mercury	>75 cm	Do not eat	Do not eat

⚠Smallmouth Bass

Contaminant	Size	General pop.	Sensitive pop.
Mercury	40-45 cm	4/month	Do not eat
Mercury	45-50 cm	4/month	Do not eat
Mercury	50-55 cm	4/month	Do not eat
Mercury	55-60 cm	2/month	Do not eat

⚠Walleye

Contaminant	Size	General pop.	Sensitive pop.
Mercury	25-30 cm	8/month	Do not eat
Mercury	30-35 cm	8/month	Do not eat
Mercury	35-40 cm	8/month	Do not eat
Mercury	40-45 cm	4/month	Do not eat
Mercury	45-50 cm	4/month	Do not eat
Mercury	50-55 cm	4/month	Do not eat
Mercury	55-60 cm	2/month	Do not eat
Mercury	60-65 cm	2/month	Do not eat
Mercury	65-70 cm	Do not eat	Do not eat
Mercury	70-75 cm	Do not eat	Do not eat
Mercury	>75 cm	Do not eat	Do not eat

Source: Provincial fish consumption advisory program (2025). Advisory data is updated annually.

Lake Profile

Est. average depth21.4 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: -99999.00 m
Reference value: -99999.00 m (rolling_6h_mean)
Percentile for date: 0th percentile
Years of record: 42
Source station: DUNCAN LAKE NEAR YELLOWKNIFE (07SB012)
Est. average depth: 21.4 m
Relationship type: direct_lake
Mapping confidence: medium
Today's normal range: 211.54–212.79 m
Same-date historical range: 210.49–213.35 m
30-day change: -10021118.7 cm
Data confidence: medium
Observed at: Sep 20, 2026
Last snapshot: Sep 20, 2026

Data source: ECCC Water Office — Station 07SB012. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.