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Map of Lac O'Neil with depth contours

Lac O'Neil

46.0545° N, 75.5766° W

Depth contours from the 2013 government survey. Not for navigation.

Download the depth map (SVG)

Lac O'Neil, Quebec. 46.0545° N, 75.5766° W

Maximum depth 16.2 m (2013 survey). Scale bar on the map.

Not for navigation. Depths are from government surveys and may be outdated.

borealbound.ca/lakes/qc/lac-o-neil-near-val-ombreuse/, 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 O'Neil is 16.2 m deep at its deepest point, shallower than 51% of the 1,506 surveyed lakes in Quebec. It covers 0.88 km² and lies 5.1 km north of Val-Ombreuse.

Maximum depth
16.2 msurveyed 2013
shallower than 51% of the 1,506 surveyed lakes in Quebec
Area
0.88 km²
larger than 72% of the 29,407 lakes in Quebec
Shoreline
5.4 km
longer than 63% of the 29,407 lakes in Quebec
Water clarity
4.9 mSecchi depth, 2025
clearer than 70% of the 805 monitored lakes in Quebec
Elevation
192 m

Today on the water

5.7 °C

Mostly CloudyWind W 5 km/h

Observed at Val-des-Monts, 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 northwest: the northwest shore is sheltered, waves build toward the southeast shore.

Time4 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/hW 10NW 10NW 20NW 20NW 20NW 10var. 5var. 5
Waves (est.) m0.10.10.20.2
Temp. °C5581111742
Precip. %6030303030000

Tonight: Partly cloudy with 60 percent chance of showers. Wind west 20 km/h becoming light early this evening. Low plus 5.

Weather: Val-des-Monts (local forecast), as of 3:01 a.m. EDT

Sun and moon

Civil dawn
6:41 a.m.
Sunrise
7:11 a.m.
Sunset
6:26 p.m.
Civil dusk
6:56 p.m.
Moonrise
6:02 a.m.
Moonset
5:45 p.m.
Moon
Waning crescent, 1% lit

Data Source: Environment and Climate Change Canada. Local times.

How waves are estimated

Significant wave height from the forecast hourly wind and the open-water distance (fetch) upwind, using the SMB method (US Army Corps of Engineers Shore Protection Manual, 1984), rounded up to the next 0.1 m. It is not a measurement: gusts, leftover swell and shoals can make water rougher. Under 0.2 m: calm; 0.2–0.5 m: choppy; over 0.5 m: rough.

Depth

78% of Lac O'Neil 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 2013 records a maximum depth of 16.2 m, drawn from 52 depth contours.

Not for navigation. Depths are from government surveys and may be outdated.

Water

Trophic status from the latest monitoring: oligo-mesotrophic (transition).

Clarity was measured with a Secchi disk in 12 years between 2014 and 2025; the latest annual mean is 4.9 m.

Water clarity (Secchi depth, m)
Total phosphorus (µg/L)