Old Woman Lake
47.6225° N, 84.7244° W
Depth contours from the 1971 government survey. Not for navigation.
Download the depth map (SVG)Old Woman Lake, Ontario. 47.6225° N, 84.7244° W
Maximum depth 42.7 m (1971 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/old-woman-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.
- 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.
Old Woman Lake is 42.7 m deep at its deepest point, deeper than 90% of the 2,688 surveyed lakes in Ontario. It covers 2.88 km² and lies 16 km southwest of Millwood.
Government surveys have recorded 10 fish species here, including brook trout and lake trout.
- Maximum depth
- 42.7 msurveyed 1971
- deeper than 90% of the 2,688 surveyed lakes in Ontario
- Area
- 2.88 km²
- larger than 86% of the 18,731 lakes in Ontario
- Shoreline
- 22.9 km
- longer than 89% of the 18,731 lakes in Ontario
- Fish species
- 10
- more than 73% of the 2,454 surveyed lakes in Ontario
- Elevation
- 366 m
Today on the water
7.9 °C
Observed at Lake Superior (Provincial Park), as of 3:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m.
| Time | 4 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/h | var. 5 | NW 10 | var. 5 | var. 5 | W 10 | var. 5 | SE 10 | SE 10 |
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | ||||
| Temp. °C | 6 | 4 | 5 | 9 | 11 | 8 | 5 | 6 |
| Precip. % | 30 | 10 | 10 | 0 | 0 | 0 | 0 | 0 |
Tonight: Partly cloudy with 60 percent chance of showers. Wind northwest 30 km/h gusting to 50 becoming light this evening. Low plus 3.
Weather: Lake Superior (Provincial Park) (local forecast), as of 3:02 a.m. EDT
Sun and moon
- Civil dawn
- 7:18 a.m.
- Sunrise
- 7:49 a.m.
- Sunset
- 7:02 p.m.
- Civil dusk
- 7:32 p.m.
- Moonrise
- 6:41 a.m.
- Moonset
- 6:20 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
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 1971 records a maximum depth of 42.7 m, drawn from 17 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 32 government surveys (2008–2013) that recorded them.
Forage fish and other species (8)
Forage fish
- Common Shiner 12
- Lake Chub 11
- Creek Chub 8
- Golden Shiner 3
- Longnose Dace 2
- Blacknose Dace 1
- Northern Redbelly Dace 1
Other
- White Sucker 22
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 3 species from Old Woman Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Brook Trout | 30-35 cm | 8 | Do not eat | Mercury |
| Lake Trout | 50-55 cm | 4 | Do not eat | Mercury |
| White Sucker | 40-45 cm | 16 | 8 | Mercury, Selenium |
* 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 10. Check seasons and limits before you fish.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.