Grand lac Bostonnais
47.8532° N, 72.2165° W
Depth contours from the 1974 government survey. Not for navigation.
Download the depth map (SVG)Grand lac Bostonnais, Quebec. 47.8532° N, 72.2165° W
Maximum depth 21.7 m (1974 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/grand-lac-bostonnais/, 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.
Grand lac Bostonnais is 21.7 m deep at its deepest point, deeper than 66% of the 1,506 surveyed lakes in Quebec. It covers 15.7 km² and lies 17 km south of Lizotte.
- Maximum depth
- 21.7 msurveyed 1974
- deeper than 66% of the 1,506 surveyed lakes in Quebec
- Area
- 15.7 km²
- larger than 97% of the 29,407 lakes in Quebec
- Shoreline
- 101 km
- longer than 98% of the 29,407 lakes in Quebec
- Elevation
- 388 m
Sun and moon today
- Civil dawn
- 6:28 a.m.
- Sunrise
- 6:59 a.m.
- Sunset
- 6:11 p.m.
- Civil dusk
- 6:42 p.m.
- Moonrise
- 5:49 a.m.
- Moonset
- 5:30 p.m.
- Moon
- Waning crescent, 1% lit
Depth
17% of Grand lac Bostonnais 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 1974 records a maximum depth of 21.7 m, drawn from 60 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 Depths are from government surveys and may be outdated.