Mamainse Lake
47.0305° N, 84.6184° W
Depth contours from the 1968 government survey. Not for navigation.
Download the depth map (SVG)Mamainse Lake, Ontario. 47.0305° N, 84.6184° W
Maximum depth 36.6 m (1968 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/mamainse-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.
- 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).
- Air Quality Health Index observations and forecasts, 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.
Mamainse Lake is 36.6 m deep at its deepest point, deeper than 85% of the 2,688 surveyed lakes in Ontario. It covers 1.49 km² and lies 10 km north of Batchawana Bay.
Government surveys have recorded 11 fish species here, including brook trout and lake trout.
- Maximum depth
- 36.6 msurveyed 1968
- deeper than 85% of the 2,688 surveyed lakes in Ontario
- Area
- 1.49 km²
- larger than 75% of the 18,731 lakes in Ontario
- Shoreline
- 8.7 km
- longer than 70% of the 18,731 lakes in Ontario
- Fish species
- 11
- more than 77% of the 2,454 surveyed lakes in Ontario
- Elevation
- 403 m
Today on the water
0.6 °C
Observed at Montreal River Harbour, as of 7:00 a.m. EDT
calm Estimated waves, next 12 hours: up to 0.1 m.
| Time | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. | 5 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | W 20 | W 20 | var. 5 | SE 10 | SE 10 | SE 10 | SE 20 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |||
| Temp. °C | 5 | 8 | 11 | 9 | 5 | 3 | 5 | 7 |
| Precip. % | 10 | 10 | 0 | 0 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud with 30 percent chance of showers early this morning. Becoming sunny this afternoon. Wind becoming west 20 km/h gusting to 40 late this morning. High 11. UV index 3 or moderate.
Weather: Montreal River Harbour (local forecast), as of 7:02 a.m. EDT
Sun and moon
- Civil dawn
- 7:17 a.m.
- Sunrise
- 7:48 a.m.
- Sunset
- 7:02 p.m.
- Civil dusk
- 7:32 p.m.
- Moonrise
- 6:40 a.m.
- Moonset
- 6:21 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Sault Ste. Marie, as of 7:00 a.m. EDT
Depth
17% of Mamainse Lake is shallower than 3 m, and 19% 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 from 1968 records a maximum depth of 36.6 m, drawn from 32 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 38 government surveys (2008–2013) that recorded them.
Forage fish and other species (9)
Forage fish
- Lake Chub 14
- Fathead Minnow 10
- Bluntnose Minnow 8
- Creek Chub 8
- Spottail Shiner 7
- Brook Stickleback 5
- Emerald Shiner 5
- Longnose Dace 1
Other
- White Sucker 30
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 2 species from Mamainse Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Brook Trout | 30-35 cm | 16 | 16 | Precautionary |
| Lake Trout | 50-55 cm | 12 | 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 10. Check seasons and limits before you fish.