Dalhousie Lake

Unusually high

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

Low (6.10m)Normal rangeHigh (6.69m)

Current Weather

2d ago

18°C

Wind NNW 9 km/h

Humidity 53%

Mainly sunny

Environment Canada — Smiths Falls - Lanark - Sharbot Lake

vs. Last Year

No data available

7-Day Trend

↓Falling

Down 12.2 cm over the past week

-12.2 cm over 7 days

Seasonal Position

97th percentile

Based on 22 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 moving slower than usual.

Based on 22 years of seasonal patterns. Moderate historical coverage. This is a historical seasonal pattern, not a forecast.

Fish Consumption Advisories (6 species)

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

Cisco (Lake Herring)

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

⚠Largemouth Bass

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

⚠Northern Pike

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

⚠Walleye

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

White Sucker

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

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

Lake Profile

Est. average depth11.3 m

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

Boat Launches (1)

Unnamed launch — 2.4 km from lake centre

Map ↗

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

Water Level — Last 30 Days

Technical details

Current level: 6.65 m
Reference value: 6.65 m (rolling_6h_mean)
Percentile for date: 97th percentile
Years of record: 22
Source station: MISSISSIPPI RIVER AT OUTLET OF DALHOUSIE LAKE (02KF019)
Est. average depth: 11.3 m
Relationship type: lake_outlet
Mapping confidence: medium
Today's normal range: 6.18–6.44 m
Same-date historical range: 6.10–6.69 m
30-day change: -19.1 cm
Data confidence: medium
Observed at: Sep 20, 2026
Last snapshot: Sep 20, 2026

Data source: ECCC Water Office — Station 02KF019. Water level readings are provisional and subject to revision. This is not a navigation or flood-warning service.