Lac Louisa
45.7671° N, 74.4235° W
Depth contours from the 2011 government survey. Not for navigation.
Download the depth map (SVG)Lac Louisa, Quebec. 45.7671° N, 74.4235° W
Maximum depth 57.3 m (2011 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-louisa/, 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 Louisa is 57.3 m deep at its deepest point, deeper than 96% of the 1,506 surveyed lakes in Quebec. It covers 4.38 km² and lies beside Lac-Louisa.
- Maximum depth
- 57.3 msurveyed 2011
- deeper than 96% of the 1,506 surveyed lakes in Quebec
- Area
- 4.38 km²
- larger than 90% of the 29,407 lakes in Quebec
- Shoreline
- 18.6 km
- longer than 87% of the 29,407 lakes in Quebec
- Water clarity
- 8.2 mSecchi depth, 2020
- clearer than 97% of the 805 monitored lakes in Quebec
- Elevation
- 268 m
Today on the water
7.3 °C
Observed at Lachute, as of 1:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m.
| 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 | W 10 | W 10 | W 10 | W 20 | W 20 | W 20 | W 10 | W 10 |
| Gusts | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | |||
| Temp. °C | 9 | 9 | 8 | 11 | 12 | 13 | 8 | 5 |
| Precip. % | 0 | 0 | 0 | 0 | 40 | 40 | 0 | 0 |
Tonight: Partly cloudy. 40 percent chance of showers this evening. Wind west 20 km/h gusting to 40 becoming light this evening. Low 8.
Weather: Lachute (local forecast), as of 1:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:36 a.m.
- Sunrise
- 7:06 a.m.
- Sunset
- 6:22 p.m.
- Civil dusk
- 6:52 p.m.
- Moonrise
- 5:57 a.m.
- Moonset
- 5:40 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
11% of Lac Louisa 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 2011 records a maximum depth of 57.3 m, drawn from 75 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: oligotrophic.
Clarity was measured with a Secchi disk in 13 years between 2008 and 2020; the latest annual mean is 8.2 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.