Lac des Mille Lacs
48.8765° N, 90.5128° W
Depth contours from the 1974 government survey. Not for navigation.
Download the depth map (SVG)Lac des Mille Lacs, Ontario. 48.8765° N, 90.5128° W
Maximum depth 27.4 m (1974 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/lac-des-mille-lacs/, 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.
Lac des Mille Lacs is 27.4 m deep at its deepest point, deeper than 74% of the 2,688 surveyed lakes in Ontario. It covers 245 km² and lies 2.4 km southwest of Savanne.
Government surveys have recorded 11 fish species here, including walleye, cisco and yellow perch.
- Maximum depth
- 27.4 msurveyed 1974
- deeper than 74% of the 2,688 surveyed lakes in Ontario
- Area
- 245 km²
- larger than 99% of the 18,731 lakes in Ontario
- Shoreline
- 751 km
- longer than 99% of the 18,731 lakes in Ontario
- Water clarity
- 1.9 mSecchi depth, 2024
- less clear than 88% of the 1,251 monitored lakes in Ontario
- Fish species
- 11
- more than 77% of the 2,454 surveyed lakes in Ontario
- Elevation
- 455 m
Today on the water
-1 °C
Observed at Upsala, as of 1:00 a.m. CDT
choppy Estimated waves, next 12 hours: up to 0.3 m.
| Time | 2 a.m. | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | var. 5 | var. 5 | S 20 | SE 20 | SE 20 | SE 20 | SE 20 |
| Gusts | 40 | 40 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.3 | ||||
| Temp. °C | 1 | -1 | 1 | 9 | 14 | 13 | 11 | 10 |
| Precip. % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Tonight: Partly cloudy with 40 percent chance of showers early this evening then clear. Wind northwest 20 km/h becoming light this evening. Low minus 2.
Weather: Upsala (local forecast), as of 1:02 a.m. CDT
Sun and moon
- Civil dawn
- 6:41 a.m.
- Sunrise
- 7:13 a.m.
- Sunset
- 6:24 p.m.
- Civil dusk
- 6:55 p.m.
- Moonrise
- 6:06 a.m.
- Moonset
- 5:43 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
26% of Lac des Mille Lacs is deeper than 10 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 1974 records a maximum depth of 27.4 m, drawn from 940 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 105 government surveys (2008–2013) that recorded them.
Forage fish and other species (4)
Forage fish
- Spottail Shiner 31
- Trout-Perch 27
Other
- White Sucker 42
- Longnose Sucker 8
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 8 species from Lac des Mille Lacs. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Whitefish | 45-50 cm | 16 | 16 | Precautionary |
| Northern Pike | 55-60 cm | 12 | 4 | Mercury |
| Smallmouth Bass | 35-40 cm | 12 | 4 | Mercury |
| Walleye | 40-45 cm | 8 | 4 | Mercury |
| Yellow Perch | 20-25 cm | 16 | 12 | Precautionary |
| Cisco (Lake Herring) | 30-35 cm | 16 | 16 | Precautionary |
| Longnose Sucker | 40-45 cm | 16 | 12 | Precautionary |
| White Sucker | 40-45 cm | 16 | 12 | 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 6. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 3 years between 2018 and 2024; the latest annual mean is 1.9 m.
Getting on the water
3 listed boat launches; 2 with parking listed. marks launches on the map.
North shore
- Maze Bay
Southeast shore
- Lac Des Mille Lacs East Access
Northwest shore
- Honkonen Narrows LDML
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.