Lac Seul

Normal

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

Low (352.61m)Normal rangeHigh (357.31m)

Current Weather

2d ago

12°CMainly Sunny

Wind N 3 km/h

Humidity 45%

Sunny

Environment Canada — Sioux Lookout - Savant Lake

vs. Last Year

No data available

7-Day Trend

↓Falling

Down 3.5 cm over the past week

-3.5 cm over 7 days

Seasonal Position

48th percentile

Based on 103 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 tracking near the seasonal norm.

Based on 102 years of seasonal patterns. This is a historical seasonal pattern, not a forecast.

Fish Consumption Advisories (10 species)

The following consumption advisories are in effect for fish caught in Lac Seul.

Burbot (Ling)

Contaminant	Size	General pop.	Sensitive pop.
Mercury	55-60 cm	12/month	4/month
Mercury	50-55 cm	16/month	4/month
Mercury	45-50 cm	16/month	8/month
Mercury	40-45 cm	16/month	8/month
Mercury	35-40 cm	16/month	8/month
Mercury	60-65 cm	12/month	4/month

Cisco (Lake Herring)

Contaminant	Size	General pop.	Sensitive pop.
	20-25 cm	32/month	—
	25-30 cm	32/month	—
Mercury	30-35 cm	16/month	12/month
Mercury	35-40 cm	16/month	8/month
Mercury	40-45 cm	16/month	8/month
Mercury	20-25 cm	—	16/month
Mercury	25-30 cm	—	12/month

Lake Whitefish

Contaminant	Size	General pop.	Sensitive pop.
	35-40 cm	32/month	32/month
	40-45 cm	32/month	—
	45-50 cm	32/month	—
	50-55 cm	32/month	—
	55-60 cm	32/month	—
	30-35 cm	32/month	32/month
Mercury	50-55 cm	—	16/month
Mercury	55-60 cm	—	12/month
Mercury	45-50 cm	—	16/month
Mercury	40-45 cm	—	16/month

⚠Northern Pike

Contaminant	Size	General pop.	Sensitive pop.
Mercury	60-65 cm	8/month	Do not eat
Mercury	65-70 cm	4/month	Do not eat
Mercury	70-75 cm	4/month	Do not eat
Mercury	>75 cm	4/month	Do not eat
Mercury	40-45 cm	16/month	8/month
Mercury	45-50 cm	16/month	4/month
Mercury	50-55 cm	8/month	Do not eat
Mercury	55-60 cm	8/month	Do not eat

Redhorse Sucker

Contaminant	Size	General pop.	Sensitive pop.
	50-55 cm	32/month	—
	45-50 cm	32/month	—
Mercury	50-55 cm	—	16/month
Mercury	45-50 cm	—	16/month

⚠Sauger

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

⚠Smallmouth Bass

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

⚠Walleye

Contaminant	Size	General pop.	Sensitive pop.
	20-25 cm	32/month	—
	15-20 cm	32/month	—
Mercury	60-65 cm	4/month	Do not eat
Mercury	70-75 cm	2/month	Do not eat
Mercury	55-60 cm	4/month	Do not eat
Mercury	65-70 cm	2/month	Do not eat
Mercury	15-20 cm	—	16/month
Mercury	20-25 cm	—	16/month
Mercury	25-30 cm	16/month	12/month
Mercury	30-35 cm	16/month	8/month
Mercury	35-40 cm	16/month	4/month
Mercury	40-45 cm	16/month	4/month
Mercury	45-50 cm	12/month	4/month
Mercury	50-55 cm	8/month	4/month

White Sucker

Contaminant	Size	General pop.	Sensitive pop.
	35-40 cm	32/month	—
	40-45 cm	32/month	—
Mercury	40-45 cm	—	12/month
Mercury	35-40 cm	—	16/month
Mercury	55-60 cm	12/month	4/month
Mercury	50-55 cm	16/month	4/month
Mercury	45-50 cm	16/month	8/month

Yellow Perch

Contaminant	Size	General pop.	Sensitive pop.
Mercury	20-25 cm	12/month	4/month
Mercury	15-20 cm	16/month	8/month

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

Boat Launches (2)

Boat Bay

2.0 kmMunicipalParking

Map ↗

Hudson West Boat Launch

2.6 kmMunicipalParking

Map ↗

Source: Ontario MNR Fishing Access Points. Verify conditions before visiting.

Water Level — Last 30 Days

Technical details

Current level: 356.42 m
Reference value: 356.42 m (rolling_6h_mean)
Percentile for date: 48th percentile
Years of record: 103
Source station: LAC SEUL AT HUDSON (05QB002)
Est. average depth: —
Relationship type: direct_lake
Mapping confidence: medium
Today's normal range: 356.06–356.71 m
Same-date historical range: 352.61–357.31 m
30-day change: +6.8 cm
Data confidence: medium
Observed at: Sep 20, 2026
Last snapshot: Sep 20, 2026

Data source: ECCC Water Office — Station 05QB002. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.