Lac Brompton
45.4253° N, 72.1446° W
Depth contours from the 1973 government survey. Not for navigation.
Download the depth map (SVG)Lac Brompton, Quebec. 45.4253° N, 72.1446° W
Maximum depth 40 m (1973 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-brompton/, 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.
- Real-time hydrometric data, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- National Water Data Archive (HYDAT) daily means, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- 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).
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Lac Brompton is 40 m deep at its deepest point, deeper than 89% of the 1,506 surveyed lakes in Quebec. It covers 11.7 km² and lies beside Lac-Brompton-Sud.
- Maximum depth
- 40 msurveyed 1973
- deeper than 89% of the 1,506 surveyed lakes in Quebec
- Area
- 11.7 km²
- larger than 96% of the 29,407 lakes in Quebec
- Shoreline
- 37 km
- longer than 94% of the 29,407 lakes in Quebec
- Water clarity
- 3.7 mSecchi depth, 2025
- less clear than 52% of the 805 monitored lakes in Quebec
- Elevation
- 235 m
Today on the water
9.5 °C
Observed at Magog, as of 3:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 9 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 4 a.m. | 7 a.m. | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | W 10 | W 20 | W 20 | W 20 | W 20 | W 15 | W 10 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.1 | 0.2 | 0.2 | ||||
| Temp. °C | 9 | 8 | 9 | 11 | 10 | 7 | 5 | 3 |
| Precip. % | 60 | 40 | 40 | 40 | 40 | 40 | 0 | 0 |
Tonight: Mainly cloudy with 60 percent chance of showers. Risk of a thunderstorm this evening. Wind west 20 km/h gusting to 40 becoming light this evening. Low 8.
Weather: Magog (local forecast), as of 3:00 a.m. EDT
Sun and moon
- Civil dawn
- 6:27 a.m.
- Sunrise
- 6:57 a.m.
- Sunset
- 6:13 p.m.
- Civil dusk
- 6:43 p.m.
- Moonrise
- 5:47 a.m.
- Moonset
- 5:31 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
27% of Lac Brompton is deeper than 20 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 1973 records a maximum depth of 40 m, drawn from 35 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 4 years between 2019 and 2025; the latest annual mean is 3.7 m.
Photos
Follow this lake
Every Friday by email: the Environment Canada forecast, the water level at the nearest gauge and any weather alerts in effect.