Lac Lacoste
46.3415° N, 74.8627° W
Depth contours from the 2010 government survey. Not for navigation.
Download the depth map (SVG)Lac Lacoste, Quebec. 46.3415° N, 74.8627° W
Maximum depth 13.9 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 Depths are from government surveys and may be outdated.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-lacoste/, 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 Lacoste is 13.9 m deep at its deepest point, shallower than 60% of the 1,506 surveyed lakes in Quebec. It covers 1.65 km² and lies beside Lac-Marsan.
- Maximum depth
- 13.9 msurveyed 2010
- shallower than 60% of the 1,506 surveyed lakes in Quebec
- Area
- 1.65 km²
- larger than 81% of the 29,407 lakes in Quebec
- Shoreline
- 12.2 km
- longer than 82% of the 29,407 lakes in Quebec
- Water clarity
- 4.2 mSecchi depth, 2025
- clearer than 56% of the 805 monitored lakes in Quebec
- Elevation
- 280 m
Today on the water
7.5 °C
Observed at Mont-Tremblant, as of 10:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m. Around 11 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. | 5 a.m. | 8 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | W 20 | W 20 | W 10 | W 10 | NW 10 | NW 10 | var. 5 |
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | ||||
| Temp. °C | 9 | 9 | 8 | 5 | 2 | 0 | -1 | -2 |
| Precip. % | 40 | 40 | 40 | 0 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud with 40 percent chance of showers. Wind becoming west 20 km/h near noon. High 9. UV index 3 or moderate.
Weather: Mont-Tremblant (local forecast), as of 10:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:38 a.m.
- Sunrise
- 7:08 a.m.
- Sunset
- 6:23 p.m.
- Civil dusk
- 6:53 p.m.
- Moonrise
- 5:59 a.m.
- Moonset
- 5:42 p.m.
- Moon
- Waning crescent, 1% lit
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 2010 records a maximum depth of 13.9 m, drawn from 29 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 18 years between 2008 and 2025; the latest annual mean is 4.2 m.