Arethusa Lake
49.7185° N, 91.8618° W
Depth contours from the 1971 government survey. Not for navigation.
Download the depth map (SVG)Arethusa Lake, Ontario. 49.7185° N, 91.8618° W
Maximum depth 15.2 m (1971 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/arethusa-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.
- 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.
Arethusa Lake is 15.2 m deep at its deepest point, shallower than 55% of the 2,688 surveyed lakes in Ontario. It covers 7.72 km² and lies 33 km northwest of Ignace.
Government surveys have recorded 13 fish species here, including walleye, northern pike and cisco.
- Maximum depth
- 15.2 msurveyed 1971
- shallower than 55% of the 2,688 surveyed lakes in Ontario
- Area
- 7.72 km²
- larger than 94% of the 18,731 lakes in Ontario
- Shoreline
- 39.5 km
- longer than 94% of the 18,731 lakes in Ontario
- Fish species
- 13
- more than 84% of the 2,454 surveyed lakes in Ontario
- Elevation
- 404 m
Today on the water
6.2 °C
Observed at Ignace, as of 9:00 a.m. CDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 7 p.m., wind from the southeast: the southeast shore is sheltered, waves build toward the northwest shore.
| Time | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. | 4 a.m. | 7 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | SE 10 | SE 10 | SE 20 | SE 20 | SE 20 | SE 20 | SE 20 |
| Gusts km/h | 40 | 40 | 40 | 40 | 40 | |||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.2 | ||||
| Temp. °C | 8 | 12 | 15 | 11 | 11 | 9 | 13 | 14 |
| Precip. % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud. Becoming cloudy this afternoon. High 15. UV index 3 or moderate.
Weather: Ignace (local forecast), as of 9:01 a.m. CDT
Sun and moon
- Civil dawn
- 6:47 a.m.
- Sunrise
- 7:19 a.m.
- Sunset
- 6:28 p.m.
- Civil dusk
- 7:00 p.m.
- Moonrise
- 6:12 a.m.
- Moonset
- 5:47 p.m.
- Moon
- Waning crescent, 1% lit
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 15.2 m, drawn from 25 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 24 government surveys (2009–2009) that recorded them.
Forage fish and other species (7)
Forage fish
- Spottail Shiner 8
- Trout-Perch 4
- Emerald Shiner 3
- Blacknose Shiner 1
- Logperch 1
Other
- White Sucker 9
- Shorthead Redhorse 2
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Arethusa Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Whitefish | 45-50 cm | 16 | 16 | Precautionary |
| Northern Pike | 55-60 cm | 4 | Do not eat | Mercury |
| Walleye | 40-45 cm | 8 | Do not eat | Mercury |
| Redhorse Sucker | 45-50 cm | 16 | 8 | Mercury |
| White Sucker | 50-55 cm | 16 | 8 | 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 4. Check seasons and limits before you fish.
Getting on the water
1 listed boat launch. marks launches on the map.
- Boat launch