Weslemkoon Lake
45.027° N, 77.4237° W
Depth contours from the 1967 government survey. Not for navigation.
Download the depth map (SVG)Weslemkoon Lake, Ontario. 45.027° N, 77.4237° W
Maximum depth 51.8 m (1967 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/weslemkoon-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.
- Aquatic Resource Area survey points, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
- 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.
- Lake Partner Program, Ontario Ministry of the Environment, Conservation and Parks. 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).
- Guide to Eating Ontario Fish: Advisory Database, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
- Ontario Waterbody Location Identifier, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
Weslemkoon Lake is 51.8 m deep at its deepest point, deeper than 94% of the 2,688 surveyed lakes in Ontario. It covers 20.7 km² and lies beside Caverlys Landing.
Government surveys have recorded 11 fish species here, including yellow perch, lake trout and rock bass.
- Maximum depth
- 51.8 msurveyed 1967
- deeper than 94% of the 2,688 surveyed lakes in Ontario
- Area
- 20.7 km²
- larger than 98% of the 18,731 lakes in Ontario
- Shoreline
- 144 km
- longer than 98% of the 18,731 lakes in Ontario
- Water clarity
- 5 mSecchi depth, 2008
- clearer than 79% of the 1,251 monitored lakes in Ontario
- Fish species
- 11
- more than 77% of the 2,454 surveyed lakes in Ontario
- Elevation
- 318 m
Today on the water
7.1 °C
Observed at Bancroft, as of 2:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.4 m.
| Time | 3 a.m. | 6 a.m. | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 |
| Gusts | 50 | 50 | ||||||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.4 | ||||
| Temp. °C | 3 | 3 | 5 | 9 | 12 | 11 | 5 | 1 |
| Precip. % | 40 | 40 | 40 | 40 | 20 | 20 | 0 | 0 |
Tonight: Partly cloudy with 60 percent chance of showers. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 2.
Weather: Bancroft (local forecast), as of 2:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:48 a.m.
- Sunrise
- 7:17 a.m.
- Sunset
- 6:35 p.m.
- Civil dusk
- 7:04 p.m.
- Moonrise
- 6:09 a.m.
- Moonset
- 5:53 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
5% of Weslemkoon Lake 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 1967 records a maximum depth of 51.8 m, drawn from 74 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.
Fish
Sport fish by the share of the 39 government surveys (2009–2009) that recorded them.
Forage fish and other species (5)
Forage fish
- Bluntnose Minnow 2
- Common Shiner 2
- Fallfish 2
Other
- White Sucker 10
- Brown Bullhead 3
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Weslemkoon Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | 50-55 cm | 4 | Do not eat | Mercury |
| Largemouth Bass | 30-35 cm | 12 | 4 | Mercury |
| Rock Bass | 15-20 cm | 12 | 4 | Mercury |
| Smallmouth Bass | 35-40 cm | 4 | Do not eat | Mercury |
| Yellow Perch | 20-25 cm | 8 | 4 | Mercury |
* As defined in the guide, including children and people who are or may become pregnant. Limits are for the length the guide lists most often; they change with the size of the fish. Read the official guide
Fishing regulations: Fisheries Management Zone 18. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 6 years between 1997 and 2008; the latest annual mean is 5 m.
Getting on the water
1 listed boat launch. marks launches on the map.
- Boat launch
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.