Lac Blanc
49.361° N, 67.5643° W
Depth contours from the 2010 government survey. Not for navigation.
Download the depth map (SVG)Lac Blanc, Quebec. 49.361° N, 67.5643° W
Maximum depth 75.2 m (2010 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-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 Blanc is 75.2 m deep at its deepest point, deeper than 98% of the 1,506 surveyed lakes in Quebec. It covers 6.05 km² and lies 13 km west of Pointe-des-Monts.
- Maximum depth
- 75.2 msurveyed 2010
- deeper than 98% of the 1,506 surveyed lakes in Quebec
- Area
- 6.05 km²
- larger than 93% of the 29,407 lakes in Quebec
- Shoreline
- 25.1 km
- longer than 90% of the 29,407 lakes in Quebec
- Water clarity
- 4.2 mSecchi depth, 2022
- clearer than 56% of the 805 monitored lakes in Quebec
- Elevation
- 154 m
Today on the water
5.8 °C
Observed at Baie-Comeau, as of 1:17 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 2 a.m. | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | SW 20 | SW 20 | SW 15 | W 20 | W 20 | W 20 | W 20 | W 20 |
| Gusts | 40 | 40 | 40 | 40 | 40 | |||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |||
| Temp. °C | 6 | 5 | 4 | 8 | 10 | 8 | 6 | 5 |
| Precip. % | 0 | 0 | 0 | 0 | 30 | 30 | 0 | 0 |
Tonight: Partly cloudy. Fog patches. Wind southwest 20 km/h. Low plus 4.
Weather: Baie-Comeau (local forecast), as of 1:18 a.m. EDT
Sun and moon
- Civil dawn
- 6:10 a.m.
- Sunrise
- 6:42 a.m.
- Sunset
- 5:51 p.m.
- Civil dusk
- 6:23 p.m.
- Moonrise
- 5:30 a.m.
- Moonset
- 5:09 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
16% of Lac Blanc is deeper than 30 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 2010 records a maximum depth of 75.2 m, drawn from 44 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: oligo-mesotrophic (transition).
Clarity was measured with a Secchi disk in 12 years between 2010 and 2022; the latest annual mean is 4.2 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.