Map of Lac Archange with depth contours

Lac Archange

46.8016° N, 72.6148° W

Depth contours from the 1967 government survey. Not for navigation.

Download the depth map (SVG)

Lac Archange is 25.8 m deep at its deepest point, deeper than 76% of the 1,506 surveyed lakes in Quebec. It covers 0.78 km² and lies 8.6 km northwest of Saint-Tite.

Maximum depth
25.8 msurveyed 1967
deeper than 76% of the 1,506 surveyed lakes in Quebec
Area
0.78 km²
larger than 70% of the 29,407 lakes in Quebec
Shoreline
10 km
longer than 78% of the 29,407 lakes in Quebec
Water clarity
3.5 mSecchi depth, 2025
less clear than 56% of the 805 monitored lakes in Quebec
Elevation
277 m

Today on the water

4.9 °C

Wind WSW 7 km/h

Observed at Shawinigan, 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 20NW 20NW 15NW 10
Gusts km/h404040
Waves (est.) m0.10.10.10.1
Temp. °C981012121097
Precip. %4030303030000

Tonight: Partly cloudy with 40 percent chance of showers. Wind west 20 km/h becoming light this evening. Low 8.

Weather: Shawinigan (local forecast), as of 3:03 a.m. EDT

Sun and moon

Civil dawn
6:29 a.m.
Sunrise
7:00 a.m.
Sunset
6:14 p.m.
Civil dusk
6:44 p.m.
Moonrise
5:50 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

18% of Lac Archange 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 1967 records a maximum depth of 25.8 m, drawn from 54 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 Depths are from government surveys and may be outdated.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 9 years between 2009 and 2025; the latest annual mean is 3.5 m.

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