Forest Lake

Normal

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

Low (8.88m)Normal rangeHigh (9.14m)

Current Weather

Sep 20

18°C

Humidity 69%

Mainly cloudy

Environment Canada — Burk's Falls - Bayfield Inlet

vs. Last Year

No data available

7-Day Trend

↓Falling

Down 2.2 cm over the past week

-2.2 cm over 7 days

Seasonal Position

74th percentile

Based on 20 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 moderately.

Tracking

This year is tracking near the seasonal norm.

Based on 19 years of seasonal patterns. Moderate historical coverage. This is a historical seasonal pattern, not a forecast.

Fish Consumption Advisories (8 species)

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

Brown Bullhead

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

⚠Largemouth Bass

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

⚠Northern Pike

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

Pumpkinseed

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

⚠Rock Bass

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

White Sucker

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

Yellow Perch

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

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

Lake Profile

Est. average depth6.7 m

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

Boat Launches (1)

Forest Lake - Tom Thompson Park

0.6 kmMunicipalParking

Map ↗

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

Water Level — Last 30 Days

Technical details

Current level: 8.96 m
Reference value: 8.96 m (rolling_6h_mean)
Percentile for date: 74th percentile
Years of record: 20
Source station: FOREST LAKE AT SOUTH RIVER (02DD023)
Est. average depth: 6.7 m
Relationship type: direct_lake
Mapping confidence: medium
Today's normal range: 8.91–8.96 m
Same-date historical range: 8.88–9.14 m
30-day change: +2.3 cm
Data confidence: medium
Observed at: Sep 20, 2026
Last snapshot: Sep 20, 2026

Data source: ECCC Water Office — Station 02DD023. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.