Lac Saint-Sébastien
46.5736° N, 73.8865° W
Depth contours from the 1983 government survey. Not for navigation.
Download the depth map (SVG)Lac Saint-Sébastien, Quebec. 46.5736° N, 73.8865° W
Maximum depth 24.1 m (1983 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-saint-sebastien/, 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 Saint-Sébastien is 24.1 m deep at its deepest point, deeper than 72% of the 1,506 surveyed lakes in Quebec. It covers 0.82 km² and lies 5.8 km west of Lac-Saint-Louis.
- Maximum depth
- 24.1 msurveyed 1983
- deeper than 72% of the 1,506 surveyed lakes in Quebec
- Area
- 0.82 km²
- larger than 71% of the 29,407 lakes in Quebec
- Shoreline
- 5.4 km
- longer than 64% of the 29,407 lakes in Quebec
- Water clarity
- 4.1 mSecchi depth, 2025
- clearer than 55% of the 805 monitored lakes in Quebec
- Elevation
- 423 m
Today on the water
4.4 °C
Observed at Saint-Michel-des-Saints, as of 8:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 12 p.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. | 4 a.m. | 7 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | W 20 | W 20 | W 15 | W 10 | W 10 | W 10 | var. 5 |
| Waves (est.) m | 0.1 | 0.2 | 0.2 | 0.1 | 0.1 | |||
| Temp. °C | 7 | 8 | 7 | 5 | 3 | 2 | 1 | -1 |
| Precip. % | 30 | 30 | 30 | 0 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud with 30 percent chance of showers. Wind becoming west 20 km/h near noon. High 8. UV index 3 or moderate.
Weather: Saint-Michel-des-Saints (local forecast), as of 9:05 a.m. EDT
Sun and moon
- Civil dawn
- 6:34 a.m.
- Sunrise
- 7:04 a.m.
- Sunset
- 6:19 p.m.
- Civil dusk
- 6:49 p.m.
- Moonrise
- 5:55 a.m.
- Moonset
- 5:37 p.m.
- Moon
- Waning crescent, 1% lit
Depth
46% of Lac Saint-Sébastien 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 1983 records a maximum depth of 24.1 m, drawn from 7 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 6 years between 2020 and 2025; the latest annual mean is 4.1 m.