Lac la Blanche
45.7269° N, 75.3151° W
Depth contours from the 1971 government survey. Not for navigation.
Download the depth map (SVG)Lac la Blanche, Quebec. 45.7269° N, 75.3151° W
Maximum depth 15.4 m (1971 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-la-blanche/, 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).
- Air Quality Health Index observations and forecasts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Lac la Blanche is 15.4 m deep at its deepest point, shallower than 55% of the 1,506 surveyed lakes in Quebec. It covers 7.28 km² and lies beside Blanche.
- Maximum depth
- 15.4 msurveyed 1971
- shallower than 55% of the 1,506 surveyed lakes in Quebec
- Area
- 7.28 km²
- larger than 94% of the 29,407 lakes in Quebec
- Shoreline
- 24.2 km
- longer than 90% of the 29,407 lakes in Quebec
- Water clarity
- 3.9 mSecchi depth, 2025
- clearer than 51% of the 805 monitored lakes in Quebec
- Elevation
- 176 m
Today on the water
5.7 °C
Observed at Val-des-Monts, 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 northwest: the northwest shore is sheltered, waves build toward the southeast shore.
| Time | 4 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/h | W 10 | NW 10 | NW 20 | NW 20 | NW 20 | NW 10 | var. 5 | var. 5 |
| Waves (est.) m | 0.1 | 0.1 | 0.2 | 0.2 | ||||
| Temp. °C | 5 | 5 | 8 | 11 | 11 | 7 | 4 | 2 |
| Precip. % | 60 | 30 | 30 | 30 | 30 | 0 | 0 | 0 |
Tonight: Partly cloudy with 60 percent chance of showers. Wind west 20 km/h becoming light early this evening. Low plus 5.
Weather: Val-des-Monts (local forecast), as of 3:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:40 a.m.
- Sunrise
- 7:09 a.m.
- Sunset
- 6:26 p.m.
- Civil dusk
- 6:55 p.m.
- Moonrise
- 6:01 a.m.
- Moonset
- 5:44 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
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 1971 records a maximum depth of 15.4 m, drawn from 14 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
- Official government depth map (PDF)
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 12 years between 2012 and 2025; the latest annual mean is 3.9 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.