Lac Isidore
46.9651° N, 70.2635° W
Depth contours from the 1977 government survey. Not for navigation.
Download the depth map (SVG)Lac Isidore, Quebec. 46.9651° N, 70.2635° W
Maximum depth 2.6 m (1977 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-isidore-near-montmagny/, 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 Isidore is 2.6 m deep at its deepest point, shallower than 98% of the 1,506 surveyed lakes in Quebec. It covers 0.44 km² and lies 5.2 km northwest of L'Espérance.
- Maximum depth
- 2.6 msurveyed 1977
- shallower than 98% of the 1,506 surveyed lakes in Quebec
- Area
- 0.44 km²
- larger than 59% of the 29,407 lakes in Quebec
- Shoreline
- 3 km
- shorter than 61% of the 29,407 lakes in Quebec
- Water clarity
- 0.7 mSecchi depth, 2025
- less clear than 100% of the 805 monitored lakes in Quebec
- Elevation
- 374 m
Today on the water
8.3 °C
Observed at L'Islet, as of 4:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m. Around 5 a.m., wind from the southwest: the southwest shore is sheltered, waves build toward the northeast shore.
| Time | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | SW 20 | SW 20 | SW 20 | SW 20 | SW 20 | SW 20 | SW 20 | SW 20 |
| Gusts km/h | 40 | 40 | 40 | 40 | 40 | 40 | 40 | |
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |||
| Temp. °C | 9 | 8 | 10 | 10 | 11 | 9 | 8 | 8 |
| Precip. % | 30 | 30 | 30 | 30 | 30 | 0 | 0 | 0 |
Tonight: A few showers ending early this evening then mainly cloudy with 30 percent chance of showers. Risk of a thunderstorm early this evening. Wind southwest 20 km/h gusting to 40. Low 8.
Weather: L'Islet (local forecast), as of 4:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:20 a.m.
- Sunrise
- 6:50 a.m.
- Sunset
- 6:04 p.m.
- Civil dusk
- 6:35 p.m.
- Moonrise
- 5:40 a.m.
- Moonset
- 5:22 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
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 1977 records a maximum depth of 2.6 m, drawn from 6 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 9 years between 2012 and 2025; the latest annual mean is 0.7 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.