Lac Sept Îles
46.932° N, 71.7442° W
Depth contours from the 2012 government survey. Not for navigation.
Download the depth map (SVG)Lac Sept Îles, Quebec. 46.932° N, 71.7442° W
Maximum depth 17 m (2012 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-sept-iles/, 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).
- Air Quality Health Index observations and forecasts, 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 Sept Îles is 17 m deep at its deepest point, deeper than 52% of the 1,506 surveyed lakes in Quebec. It covers 4.27 km² and lies beside Lac-Sept-Îles.
- Maximum depth
- 17 msurveyed 2012
- deeper than 52% of the 1,506 surveyed lakes in Quebec
- Area
- 4.27 km²
- larger than 90% of the 29,407 lakes in Quebec
- Shoreline
- 24.1 km
- longer than 90% of the 29,407 lakes in Quebec
- Water clarity
- 3.5 mSecchi depth, 2025
- less clear than 56% of the 805 monitored lakes in Quebec
- Elevation
- 208 m
Today on the water
YELLOW ADVISORY - FROST · issued 8:47 a.m. EDT
Temperatures will drop to near freezing overnight tonoght as well as overnight Saturday to Sunday. Take preventative measures to protect cold-sensitive plants, trees, and crops. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on social media using #QCStorm.
Official alert on weather.gc.ca · expires 12:47 a.m. EDT Saturday
8.2 °C
Observed at Donnacona, as of 10:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 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 20 | W 20 | W 20 | W 20 | W 20 | W 20 | W 20 | W 15 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.2 | ||||
| Temp. °C | 9 | 11 | 10 | 6 | 3 | 0 | 3 | 3 |
| 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 gusting to 40 this morning. High 11. UV index 3 or moderate.
Weather: Donnacona (local forecast), as of 10:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:26 a.m.
- Sunrise
- 6:56 a.m.
- Sunset
- 6:10 p.m.
- Civil dusk
- 6:41 p.m.
- Moonrise
- 5:46 a.m.
- Moonset
- 5:28 p.m.
- Moon
- Waning crescent, 1% lit
Depth
16% of Lac Sept Îles 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 2012 records a maximum depth of 17 m, drawn from 42 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: mesotrophic.
Clarity was measured with a Secchi disk in 20 years between 2004 and 2025; the latest annual mean is 3.5 m.