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Map of Lac du Castor Blanc with depth contours

Lac du Castor Blanc

46.549° N, 75.7964° W

Depth contours from the 1979 government survey. Not for navigation.

Download the depth map (SVG)

Lac du Castor Blanc, Quebec. 46.549° N, 75.7964° W

Maximum depth 21 m (1979 survey). Scale bar on the map.

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/qc/lac-du-castor-blanc/, compiled October 9, 2026

  • Canadian Geographical Names Database, Natural Resources Canada. Contains information licensed under the Open Government Licence – Canada.
  • HydroLAKES v1.0, Messager et al. 2016 / WWF HydroSHEDS. Licensed under CC BY 4.0.
  • Census boundaries and population, 2021, Statistics Canada. Adapted from Statistics Canada. This does not constitute an endorsement by Statistics Canada.
  • Géobase des bathymétries de lac du Québec (GBLQ), Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs. Licensed under CC BY 4.0. Source: Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP), Données Québec.
  • États trophiques des lacs (RSVL), Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs. Licensed under CC BY 4.0. Source: Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP), Données Québec.
  • City page weather forecasts and alerts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).

Lac du Castor Blanc is 21 m deep at its deepest point, deeper than 64% of the 1,506 surveyed lakes in Quebec. It covers 2.18 km² and lies 1.3 km northeast of Saint-Cajetan.

Maximum depth
21 msurveyed 1979
deeper than 64% of the 1,506 surveyed lakes in Quebec
Area
2.18 km²
larger than 84% of the 29,407 lakes in Quebec
Shoreline
17.6 km
longer than 86% of the 29,407 lakes in Quebec
Water clarity
3.3 mSecchi depth, 2025
less clear than 60% of the 805 monitored lakes in Quebec
Elevation
236 m

Today on the water

6.7 °C

Wind WNW 7 km/h

Observed at Mont-Laurier, as of 4:00 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.

Time5 a.m.8 a.m.11 a.m.2 p.m.5 p.m.8 p.m.11 p.m.2 a.m.
Wind km/hW 10W 10W 10NW 20NW 20NW 15NW 10var. 5
Waves (est.) m0.10.10.10.20.2
Temp. °C447108420
Precip. %6030303030000

Tonight: Mainly cloudy with 60 percent chance of showers. Wind west 20 km/h becoming light this evening. Low plus 4.

Weather: Mont-Laurier (local forecast), as of 4:02 a.m. EDT

Sun and moon

Civil dawn
6:42 a.m.
Sunrise
7:12 a.m.
Sunset
6:27 p.m.
Civil dusk
6:57 p.m.
Moonrise
6:03 a.m.
Moonset
5:45 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

10% of Lac du Castor Blanc 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 1979 records a maximum depth of 21 m, drawn from 33 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 17 years between 2009 and 2025; the latest annual mean is 3.3 m.

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