Map of Bruce Lake with depth contours

Bruce Lake

45.1861° N, 79.644° W

Depth contours from the 1974 government survey. Not for navigation.

Download the depth map (SVG)

Bruce Lake is 6.1 m deep at its deepest point, shallower than 86% of the 2,688 surveyed lakes in Ontario. It covers 0.98 km² and lies 1.7 km west of Morinus.

Maximum depth
6.1 msurveyed 1974
shallower than 86% of the 2,688 surveyed lakes in Ontario
Area
0.98 km²
larger than 67% of the 18,731 lakes in Ontario
Shoreline
6.1 km
longer than 57% of the 18,731 lakes in Ontario
Water clarity
4.4 mSecchi depth, 2025
clearer than 70% of the 1,251 monitored lakes in Ontario
Elevation
238 m

Today on the water

4.3 °C

ClearWind calm

Observed at Port Carling, as of 6:00 a.m. EDT

choppy Estimated waves, next 12 hours: up to 0.2 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.

Hourly forecast, next 24 hours
Time7 a.m.10 a.m.1 p.m.4 p.m.7 p.m.10 p.m.1 a.m.4 a.m.
Wind km/hW 15W 15NW 30NW 30NW 15var. 5var. 5var. 5
Gusts km/h5050
Waves (est.) m0.10.10.20.2
Temp. °C58121411753
Precip. %4040402020000

Today: A mix of sun and cloud with 40 percent chance of showers this morning and early this afternoon. Clearing this afternoon. Wind becoming northwest 30 km/h gusting to 50 near noon. High 14. UV index 4 or moderate.

Weather: Port Carling (local forecast), as of 6:01 a.m. EDT

Sun and moon

Civil dawn
6:57 a.m.
Sunrise
7:26 a.m.
Sunset
6:43 p.m.
Civil dusk
7:13 p.m.
Moonrise
6:19 a.m.
Moonset
6:02 p.m.
Moon
Waning crescent, 1% lit

Air Quality Health Index

1 low risk

Parry Sound, as of 4:00 a.m. EDT

Data Source: Environment and Climate Change Canada. Local times.

How waves are estimated

Significant wave height from the forecast hourly wind and the open-water distance (fetch) upwind, using the SMB method (US Army Corps of Engineers Shore Protection Manual, 1984), rounded up to the next 0.1 m. It is not a measurement: gusts, leftover swell and shoals can make water rougher. Under 0.2 m: calm; 0.2–0.5 m: choppy; over 0.5 m: rough.

Depth

32% of Bruce Lake is shallower than 3 m.

How to read it: the lake’s area is sorted from the shore to the deepest point. Where the curve is flat, large areas share one depth (flats and weed beds); where it drops, depth changes quickly (drop-offs).

The government depth survey from 1974 records a maximum depth of 6.1 m, drawn from 6 depth contours.

Not for navigation. Depths are from government surveys and may be outdated.

Water

Clarity was measured with a Secchi disk in 30 years between 1993 and 2025; the latest annual mean is 4.4 m.

Water clarity (Secchi depth, m)
Total phosphorus (µg/L)