Map of Lac Bran de Scie with depth contours

Lac Bran de Scie

45.4058° N, 72.2024° W

Depth contours from the 2012 government survey. Not for navigation.

Download the depth map (SVG)

Lac Bran de Scie is 23.7 m deep at its deepest point, deeper than 72% of the 1,506 surveyed lakes in Quebec. It covers 0.91 km² and lies beside Domaine-des-Trois-Lacs.

Maximum depth
23.7 msurveyed 2012
deeper than 72% of the 1,506 surveyed lakes in Quebec
Area
0.91 km²
larger than 73% of the 29,407 lakes in Quebec
Shoreline
11.1 km
longer than 80% of the 29,407 lakes in Quebec
Water clarity
4.6 mSecchi depth, 2025
clearer than 64% of the 805 monitored lakes in Quebec
Elevation
267 m

Today on the water

9.5 °C

Wind NNW 3 km/h

Observed at Magog, as of 3:00 a.m. EDT

calm Estimated waves, next 12 hours: up to 0.1 m. Around 4 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.

Hourly forecast, next 24 hours
Time4 a.m.7 a.m.10 a.m.1 p.m.4 p.m.7 p.m.10 p.m.1 a.m.
Wind km/hW 10W 10W 20W 20W 20W 20W 15W 10
Gusts km/h404040
Waves (est.) m0.10.10.10.1
Temp. °C9891110753
Precip. %60404040404000

Tonight: Mainly cloudy with 60 percent chance of showers. Risk of a thunderstorm this evening. Wind west 20 km/h gusting to 40 becoming light this evening. Low 8.

Weather: Magog (local forecast), as of 3:00 a.m. EDT

Sun and moon

Civil dawn
6:27 a.m.
Sunrise
6:57 a.m.
Sunset
6:14 p.m.
Civil dusk
6:43 p.m.
Moonrise
5:47 a.m.
Moonset
5:32 p.m.
Moon
Waning crescent, 1% lit

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

36% of Lac Bran de Scie is shallower than 3 m, and 30% is deeper than 10 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 2012 records a maximum depth of 23.7 m, drawn from 38 depth contours.

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 Depths are from government surveys and may be outdated.

Water

Trophic status from the latest monitoring: oligo-mesotrophic (transition).

Clarity was measured with a Secchi disk in 22 years between 2004 and 2025; the latest annual mean is 4.6 m.

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