Map of Lac Pontbriand with depth contours

Lac Pontbriand

46.0519° N, 73.7719° W

Depth contours from the 1977 government survey. Not for navigation.

Download the depth map (SVG)

Lac Pontbriand is 9.4 m deep at its deepest point, shallower than 77% of the 1,506 surveyed lakes in Quebec. It covers 1.48 km² and lies 1.1 km northeast of Mount Loyal.

Maximum depth
9.4 msurveyed 1977
shallower than 77% of the 1,506 surveyed lakes in Quebec
Area
1.48 km²
larger than 80% of the 29,407 lakes in Quebec
Shoreline
15 km
longer than 84% of the 29,407 lakes in Quebec
Water clarity
2.5 mSecchi depth, 2014
less clear than 78% of the 805 monitored lakes in Quebec
Elevation
152 m

Today on the water

6.2 °C

Wind SSW 4 km/h

Observed at Saint-Lin-Laurentides, as of 3:00 a.m. EDT

choppy Estimated waves, next 12 hours: up to 0.2 m. Around 9 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 10W 10
Gusts km/h404040
Waves (est.) m0.10.10.20.20.2
Temp. °C871013141175
Precip. %40004040000

Tonight: Partly cloudy with 40 percent chance of showers. Wind west 20 km/h gusting to 40 becoming light this evening. Low 7.

Weather: Saint-Lin-Laurentides (local forecast), as of 3:00 a.m. EDT

Sun and moon

Civil dawn
6:34 a.m.
Sunrise
7:04 a.m.
Sunset
6:19 p.m.
Civil dusk
6:49 p.m.
Moonrise
5:54 a.m.
Moonset
5:37 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

The government depth survey from 1977 records a maximum depth of 9.4 m, drawn from 21 depth contours.

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 Depths are from government surveys and may be outdated.

Water

Trophic status from the latest monitoring: oligotrophic.

Clarity was measured with a Secchi disk in 4 years between 2011 and 2014; the latest annual mean is 2.5 m.

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