Namakan Lake

Unusually low

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

Low (340.40m)Normal rangeHigh (340.64m)

Current Weather

2d ago

13°C

Wind E 13 km/h

Humidity 74%

Mainly sunny

Environment Canada — Fort Frances - Rainy Lake

vs. Last Year

No data available

7-Day Trend

↓Falling

Down 9.9 cm over the past week

-9.9 cm over 7 days

Seasonal Position

9th percentile

Based on 18 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 slower than usual.

Based on 17 years of seasonal patterns. Moderate historical coverage. This is a historical seasonal pattern, not a forecast.

Fish Consumption Advisories (7 species)

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

⚠Burbot (Ling)

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

Lake Whitefish

Contaminant	Size	General pop.	Sensitive pop.
	25-30 cm	32/month	—
	30-35 cm	32/month	—
	35-40 cm	32/month	—
	40-45 cm	32/month	—
	45-50 cm	32/month	—
	20-25 cm	32/month	—
Mercury	20-25 cm	—	16/month
Mercury	25-30 cm	—	16/month
Mercury	30-35 cm	—	16/month
Mercury	35-40 cm	—	16/month
Mercury	40-45 cm	—	16/month
Mercury	45-50 cm	—	12/month

⚠Northern Pike

Contaminant	Size	General pop.	Sensitive pop.
Mercury	70-75 cm	2/month	Do not eat
Mercury	>75 cm	Do not eat	Do not eat
Mercury	40-45 cm	12/month	4/month
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

⚠Sauger

Contaminant	Size	General pop.	Sensitive pop.
Mercury	20-25 cm	8/month	Do not eat
Mercury	15-20 cm	12/month	4/month
Mercury	25-30 cm	4/month	Do not eat
Mercury	30-35 cm	4/month	Do not eat

⚠Smallmouth Bass

Contaminant	Size	General pop.	Sensitive pop.
Mercury	45-50 cm	4/month	Do not eat
Mercury	15-20 cm	16/month	4/month
Mercury	20-25 cm	12/month	4/month
Mercury	25-30 cm	8/month	4/month
Mercury	30-35 cm	8/month	4/month
Mercury	35-40 cm	8/month	Do not eat
Mercury	40-45 cm	4/month	Do not eat

⚠Walleye

Contaminant	Size	General pop.	Sensitive pop.
Mercury	60-65 cm	Do not eat	Do not eat
Mercury	20-25 cm	12/month	4/month
Mercury	25-30 cm	8/month	4/month
Mercury	30-35 cm	4/month	Do not eat
Mercury	35-40 cm	4/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	2/month	Do not eat
Mercury	55-60 cm	2/month	Do not eat

White Sucker

Contaminant	Size	General pop.	Sensitive pop.
Mercury	50-55 cm	12/month	4/month
Mercury	45-50 cm	16/month	4/month
Mercury	40-45 cm	16/month	8/month
Mercury	55-60 cm	8/month	4/month

Source: Guide to Eating Ontario Fish (2025). Advisory data is updated annually.

Water Level — Last 30 Days

Technical details

Current level: 340.46 m
Reference value: 340.46 m (rolling_6h_mean)
Percentile for date: 9th percentile
Years of record: 18
Source station: NAMAKAN LAKE AT SQUIRREL ISLAND (05PA013)
Est. average depth: —
Relationship type: direct_lake
Mapping confidence: medium
Today's normal range: 340.51–340.56 m
Same-date historical range: 340.40–340.64 m
30-day change: -17.3 cm
Data confidence: medium
Observed at: Sep 20, 2026
Last snapshot: Sep 20, 2026

Data source: ECCC Water Office — Station 05PA013. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.