Lake St. Clair

Historical data only

The monitoring station for this lake is no longer active, so live water levels are not available. Historical seasonal patterns and other lake information are shown below.

Current Weather

2d ago

18°CCloudy

Wind NNE 18 km/h

Humidity 69%

Chance of showers

Environment Canada — Windsor - Essex - Chatham-Kent

Typical Range for Today

174.70 – 175.28 m

25th to 75th percentile (normal range)

Historical Min / Max for Today

174.19 – 175.82 m

Based on 66 years of records

Fish Consumption Advisories (15 species)

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

⚠Black Crappie

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

Bluegill

Contaminant	Size	General pop.	Sensitive pop.
Mercury	25-30 cm	8/month	4/month
Mercury	15-20 cm	16/month	12/month
Mercury	20-25 cm	—	4/month
Mercury, PCB	20-25 cm	16/month	—

⚠Brown Bullhead

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

⚠Channel Catfish

Contaminant	Size	General pop.	Sensitive pop.
Mercury	70-75 cm	—	Do not eat
Mercury	65-70 cm	—	Do not eat
Mercury	55-60 cm	—	4/month
Mercury, PCB	>75 cm	—	Do not eat
Mercury, PCB	45-50 cm	—	8/month
PCB	>75 cm	1/month	—
PCB	20-25 cm	8/month	8/month
PCB	25-30 cm	8/month	8/month
PCB	30-35 cm	8/month	8/month
PCB	35-40 cm	8/month	8/month
PCB	40-45 cm	8/month	8/month
PCB	45-50 cm	8/month	—
PCB	50-55 cm	4/month	4/month
PCB	55-60 cm	4/month	—
PCB	60-65 cm	2/month	Do not eat
PCB	65-70 cm	2/month	—
PCB	70-75 cm	2/month	—

⚠Common Carp

Contaminant	Size	General pop.	Sensitive pop.
Mercury	65-70 cm	—	4/month
Mercury	70-75 cm	—	4/month
Mercury	>75 cm	—	Do not eat
Mercury	55-60 cm	—	12/month
Mercury	60-65 cm	—	8/month
Mercury, PCB	>75 cm	4/month	—
Mercury, PCB, PFAS	50-55 cm	—	16/month
Mercury, PCB, PFAS	35-40 cm	—	16/month
Mercury, PCB, PFAS	40-45 cm	—	16/month
Mercury, PCB, PFAS	45-50 cm	—	16/month
PCB	65-70 cm	12/month	—
PCB	70-75 cm	8/month	—
PCB	60-65 cm	12/month	—
PCB, PFAS	45-50 cm	16/month	—
PCB, PFAS	35-40 cm	16/month	—
PCB, PFAS	25-30 cm	16/month	16/month
PCB, PFAS	30-35 cm	16/month	16/month
PCB, PFAS	55-60 cm	16/month	—
PCB, PFAS	50-55 cm	16/month	—
PCB, PFAS	40-45 cm	16/month	—

⚠Freshwater Drum

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

⚠Largemouth Bass

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

⚠Northern Pike

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

Pumpkinseed

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

⚠Rock Bass

Contaminant	Size	General pop.	Sensitive pop.
Mercury	20-25 cm	12/month	4/month
Mercury	25-30 cm	4/month	Do not eat
Mercury	30-35 cm	2/month	Do not eat
Mercury	15-20 cm	16/month	8/month

⚠Smallmouth Bass

Contaminant	Size	General pop.	Sensitive pop.
Mercury	50-55 cm	—	Do not eat
Mercury	45-50 cm	—	Do not eat
Mercury	40-45 cm	—	Do not eat
Mercury, PFAS	35-40 cm	4/month	4/month
Mercury, PFAS	30-35 cm	4/month	4/month
Mercury, PFAS	40-45 cm	4/month	—
Mercury, PFAS	45-50 cm	4/month	—
Mercury, PFAS	50-55 cm	4/month	—
PFAS	25-30 cm	4/month	4/month
PFAS	20-25 cm	4/month	4/month
PFAS	15-20 cm	4/month	4/month

⚠Walleye

Contaminant	Size	General pop.	Sensitive pop.
Mercury	50-55 cm	4/month	Do not eat
Mercury	20-25 cm	16/month	—
Mercury	40-45 cm	12/month	4/month
Mercury	45-50 cm	8/month	4/month
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	30-35 cm	—	12/month
Mercury	35-40 cm	—	8/month
Mercury, PCB, PFAS	25-30 cm	—	16/month
Mercury, PCB, PFAS	35-40 cm	16/month	—
Mercury, PFAS	20-25 cm	—	16/month
PCB	25-30 cm	16/month	—
PCB, PFAS	30-35 cm	16/month	—

⚠White Bass

Contaminant	Size	General pop.	Sensitive pop.
Mercury	40-45 cm	—	Do not eat
Mercury, PFAS	30-35 cm	—	4/month
Mercury, PFAS	35-40 cm	4/month	4/month
Mercury, PFAS	25-30 cm	—	4/month
Mercury, PFAS	40-45 cm	4/month	—
PFAS	15-20 cm	4/month	4/month
PFAS	20-25 cm	4/month	4/month
PFAS	25-30 cm	4/month	—
PFAS	30-35 cm	4/month	—

⚠White Perch

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

⚠Yellow Perch

Contaminant	Size	General pop.	Sensitive pop.
Mercury	35-40 cm	4/month	Do not eat
Mercury	25-30 cm	8/month	4/month
Mercury	20-25 cm	16/month	8/month
Mercury	30-35 cm	4/month	Do not eat
Mercury, PFAS	15-20 cm	—	16/month
PFAS	15-20 cm	16/month	—

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

Lake Profile

Est. average depth2.9 m

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

Technical details

Years of record: 66
Source station: LAKE ST. CLAIR AT TECUMSEH (02GH006)
Est. average depth: 2.9 m
Station status: Discontinued
Relationship type: direct_lake
Mapping confidence: medium
Today's normal range: 174.70–175.28 m
Same-date historical range: 174.19–175.82 m

Data source: ECCC Water Office — Station 02GH006. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.