Lac Saint-François
47.7477° N, 69.3015° W
Depth contours from the 1974 government survey. Not for navigation.
Download the depth map (SVG)Lac Saint-François, Quebec. 47.7477° N, 69.3015° W
Maximum depth 9.5 m (1974 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-saint-francois/, 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).
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Lac Saint-François is 9.5 m deep at its deepest point, shallower than 76% of the 1,506 surveyed lakes in Quebec. It covers 2.66 km² and lies 7.2 km east of Saint-Modeste-Station.
- Maximum depth
- 9.5 msurveyed 1974
- shallower than 76% of the 1,506 surveyed lakes in Quebec
- Area
- 2.66 km²
- larger than 86% of the 29,407 lakes in Quebec
- Shoreline
- 11.4 km
- longer than 80% of the 29,407 lakes in Quebec
- Water clarity
- 2.5 mSecchi depth, 2025
- less clear than 78% of the 805 monitored lakes in Quebec
- Elevation
- 266 m
Today on the water
8.5 °C
Observed at Rivière-du-Loup, as of 2:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 4 a.m., wind from the southwest: the southwest shore is sheltered, waves build toward the northeast 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 | SW 20 | SW 20 | W 20 | W 20 | W 20 | W 20 | W 20 | W 20 |
| Gusts km/h | 40 | 40 | 40 | 40 | 40 | 40 | ||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.2 | ||||
| Temp. °C | 7 | 6 | 7 | 8 | 8 | 6 | 5 | 5 |
| Precip. % | 0 | 0 | 30 | 30 | 30 | 0 | 0 | 0 |
Tonight: A few showers ending this evening then partly cloudy. Risk of a thunderstorm early this evening. Wind southwest 20 km/h. Low 6.
Weather: Rivière-du-Loup (local forecast), as of 3:05 a.m. EDT
Sun and moon
- Civil dawn
- 6:16 a.m.
- Sunrise
- 6:47 a.m.
- Sunset
- 6:00 p.m.
- Civil dusk
- 6:31 p.m.
- Moonrise
- 5:36 a.m.
- Moonset
- 5:18 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
29% of Lac Saint-François is shallower than 3 m, and 52% is deeper than 5 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 9.5 m, drawn from 12 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: meso-eutrophic (transition).
Clarity was measured with a Secchi disk in 21 years between 2004 and 2025; the latest annual mean is 2.5 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.