Lac Opasatica
48.1331° N, 79.3349° W
Depth contours from the 1980 government survey. Not for navigation.
Download the depth map (SVG)Lac Opasatica, Quebec. 48.1331° N, 79.3349° W
Maximum depth 60.4 m (1980 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-opasatica/, 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 Opasatica is 60.4 m deep at its deepest point, deeper than 96% of the 1,506 surveyed lakes in Quebec. It covers 50.5 km² and lies 2.3 km south of Lac-Fortune.
- Maximum depth
- 60.4 msurveyed 1980
- deeper than 96% of the 1,506 surveyed lakes in Quebec
- Area
- 50.5 km²
- larger than 99% of the 29,407 lakes in Quebec
- Shoreline
- 143 km
- longer than 98% of the 29,407 lakes in Quebec
- Water clarity
- 1.4 mSecchi depth, 2025
- less clear than 95% of the 805 monitored lakes in Quebec
- Elevation
- 261 m
Today on the water
4.5 °C
Observed at Rouyn-Noranda, as of 1:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.4 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 15 | W 15 | W 15 | W 20 | NW 20 | NW 20 | W 10 | W 10 |
| Gusts | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.2 | 0.4 | |||
| Temp. °C | 2 | 1 | 1 | 4 | 9 | 7 | 4 | 2 |
| Precip. % | 0 | 0 | 30 | 30 | 30 | 0 | 0 | 0 |
Tonight: Partly cloudy. 60 percent chance of showers this evening. Wind northwest 20 km/h gusting to 40 becoming light early this evening. Low plus 1.
Weather: Rouyn-Noranda (local forecast), as of 1:03 a.m. EDT
Sun and moon
- Civil dawn
- 6:57 a.m.
- Sunrise
- 7:28 a.m.
- Sunset
- 6:40 p.m.
- Civil dusk
- 7:11 p.m.
- Moonrise
- 6:19 a.m.
- Moonset
- 5:58 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
7% of Lac Opasatica 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 1980 records a maximum depth of 60.4 m, drawn from 91 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: eutrophic.
Clarity was measured with a Secchi disk in 8 years between 2008 and 2025; the latest annual mean is 1.4 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.