Map of Lac Vert with depth contours

Lac Vert

46.6859° N, 70.7108° W

Depth contours from the 1982 government survey. Not for navigation.

Download the depth map (SVG)

Lac Vert is 2.7 m deep at its deepest point, shallower than 98% of the 1,506 surveyed lakes in Quebec. It covers 0.34 km² and lies beside Lac-Vert.

Maximum depth
2.7 msurveyed 1982
shallower than 98% of the 1,506 surveyed lakes in Quebec
Area
0.34 km²
larger than 52% of the 29,407 lakes in Quebec
Shoreline
3.3 km
shorter than 55% of the 29,407 lakes in Quebec
Water clarity
1.6 mSecchi depth, 2024
less clear than 92% of the 805 monitored lakes in Quebec
Elevation
313 m

Today on the water

10.1 °C

Wind WSW 17 km/h

Observed at Montmagny, as of 10:00 a.m. EDT

calm Estimated waves, next 12 hours: up to 0.1 m. Around 11 a.m., wind from the southwest: the southwest shore is sheltered, waves build toward the northeast shore.

Hourly forecast, next 24 hours
Time11 a.m.2 p.m.5 p.m.8 p.m.11 p.m.2 a.m.5 a.m.8 a.m.
Wind km/hSW 20SW 20SW 20SW 20SW 20SW 20SW 20W 20
Gusts km/h40404040404040
Waves (est.) m0.10.10.10.1
Temp. °C101112108875
Precip. %30303000000

Today: A mix of sun and cloud with 30 percent chance of showers. Wind southwest 20 km/h gusting to 40. High 12. UV index 3 or moderate.

Weather: Montmagny (local forecast), as of 10:00 a.m. EDT

Sun and moon

Civil dawn
6:22 a.m.
Sunrise
6:52 a.m.
Sunset
6:07 p.m.
Civil dusk
6:37 p.m.
Moonrise
5:42 a.m.
Moonset
5:25 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

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 1982 records a maximum depth of 2.7 m, drawn from 13 depth contours.

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 Depths are from government surveys and may be outdated.

Water

Trophic status from the latest monitoring: mesotrophic.

Clarity was measured with a Secchi disk in 14 years between 2010 and 2024; the latest annual mean is 1.6 m.

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

Photos

Lac Vert - Saint-Nérée-de-Bellechasse
Photo: Gabriel Picard, CC BY-SA 4.0, via Wikimedia Commons