Onamakawash Lake
50.3123° N, 89.6151° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Onamakawash Lake, Ontario. 50.3123° N, 89.6151° W
Maximum depth 42.7 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/onamakawash-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.
- 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).
Onamakawash Lake is 42.7 m deep at its deepest point, deeper than 90% of the 2,688 surveyed lakes in Ontario. It covers 14.2 km² and lies 5.7 km west of Collins.
- Maximum depth
- 42.7 m
- deeper than 90% of the 2,688 surveyed lakes in Ontario
- Area
- 14.2 km²
- larger than 97% of the 18,731 lakes in Ontario
- Shoreline
- 92.9 km
- longer than 98% of the 18,731 lakes in Ontario
- Elevation
- 369 m
Today on the water
-2.5 °C
Observed at Armstrong, as of 6:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m. Around 7 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 7 a.m. | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. | 4 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | var. 5 | var. 5 | var. 5 | SE 10 | S 15 | SE 20 | SE 20 |
| Gusts km/h | 40 | 40 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |||
| Temp. °C | -3 | 2 | 8 | 11 | 9 | 7 | 4 | 4 |
| Precip. % | 20 | 20 | 20 | 20 | 60 | 60 | 60 | 20 |
Today: Increasing cloudiness early this morning. Wind up to 15 km/h. High 12. Wind chill minus 7 this morning. UV index 2 or low.
Weather: Armstrong (local forecast), as of 6:02 a.m. EDT
Sun and moon
- Civil dawn
- 7:38 a.m.
- Sunrise
- 8:11 a.m.
- Sunset
- 7:19 p.m.
- Civil dusk
- 7:51 p.m.
- Moonrise
- 7:03 a.m.
- Moonset
- 6:37 p.m.
- Moon
- Waning crescent, 1% lit
Depth
25% of Onamakawash Lake is shallower than 3 m, and 20% is deeper than 20 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 records a maximum depth of 42.7 m, drawn from 87 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
Not for navigation. Depths are from government surveys and may be outdated.