BorealBoundFrançais
Map of Williamson Lake with depth contours

Williamson Lake

48.9044° N, 91.8686° W

Depth contours from the 1975 government survey. Not for navigation.

Download the depth map (SVG)

Williamson Lake, Ontario. 48.9044° N, 91.8686° W

Maximum depth 12.2 m (1975 survey). Scale bar on the map.

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/williamson-lake/, 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.
  • Fishing access points, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
  • Fisheries Management Zones, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
  • Bathymetry lines and survey index, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
  • 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).

Williamson Lake is 12.2 m deep at its deepest point, shallower than 65% of the 2,688 surveyed lakes in Ontario. It covers 5.07 km² and lies 17 km northwest of Steep Rock Lake.

Maximum depth
12.2 msurveyed 1975
shallower than 65% of the 2,688 surveyed lakes in Ontario
Area
5.07 km²
larger than 91% of the 18,731 lakes in Ontario
Shoreline
30.5 km
longer than 92% of the 18,731 lakes in Ontario
Elevation
440 m

Today on the water

-1 °C

Wind calmfeels like -2 °C

Observed at Atikokan, as of 4:00 a.m. EST

choppy Estimated waves, next 12 hours: up to 0.2 m. Around 10 a.m., wind from the southeast: the southeast shore is sheltered, waves build toward the northwest shore.

Time5 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/hSE 10SE 10SE 20SE 20SE 20SE 20SE 20SE 20
Gusts km/h4040
Waves (est.) m0.10.10.20.20.2
Temp. °C-119141311109
Precip. %00000000

Tonight: Partly cloudy with 40 percent chance of showers early this evening then clear. Wind northwest 20 km/h gusting to 40 becoming light this evening. Low minus 2.

Weather: Atikokan (local forecast), as of 4:00 a.m. EST

Sun and moon

Civil dawn
6:47 a.m.
Sunrise
7:19 a.m.
Sunset
6:29 p.m.
Civil dusk
7:01 p.m.
Moonrise
6:12 a.m.
Moonset
5:48 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

63% of Williamson Lake is shallower than 3 m, and 18% 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 1975 records a maximum depth of 12.2 m, drawn from 42 depth contours.

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

Getting on the water

2 listed boat launches. marks launches on the map.

Northeast shore

Southeast shore