Lake Rosseau
45.1737° N, 79.5983° W
Depth contours from the 2002 government survey. Not for navigation.
Download the depth map (SVG)Lake Rosseau, Ontario. 45.1737° N, 79.5983° W
Maximum depth 89 m (2002 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/lake-rosseau/, 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.
- Real-time hydrometric data, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- National Water Data Archive (HYDAT) daily means, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- 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.
- Ontario Waterbody Location Identifier, Ontario Ministry of Natural Resources. 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.
Lake Rosseau is 89 m deep at its deepest point, deeper than 99% of the 2,688 surveyed lakes in Ontario. It covers 65.7 km² and lies beside Rosseau.
Government surveys have recorded 26 fish species here, including rock bass, cisco and smallmouth bass.
- Maximum depth
- 89 msurveyed 2002
- deeper than 99% of the 2,688 surveyed lakes in Ontario
- Area
- 65.7 km²
- larger than 99% of the 18,731 lakes in Ontario
- Shoreline
- 200 km
- longer than 99% of the 18,731 lakes in Ontario
- Water clarity
- 4 mSecchi depth, 2025
- clearer than 61% of the 1,251 monitored lakes in Ontario
- Fish species
- 26
- more than 98% of the 2,454 surveyed lakes in Ontario
- Elevation
- 224 m
Today on the water
7.4 °C
Observed at Port Carling, as of 9:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.5 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast 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 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 | var. 5 | SE 15 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.2 | 0.5 | 0.5 | 0.2 | 0.1 | |||
| Temp. °C | 8 | 12 | 14 | 11 | 7 | 5 | 3 | 5 |
| Precip. % | 40 | 40 | 20 | 20 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud with 40 percent chance of showers this morning and early this afternoon. Clearing this afternoon. Wind becoming northwest 30 km/h gusting to 50 near noon. High 14. UV index 4 or moderate.
Weather: Port Carling (local forecast), as of 9:01 a.m. EDT
Water level
Lake Rosseau at Port Carling: 8.77 m at 9:00 a.m. EDT: 5 cm below the median for this time of year, below the normal range.
Normal range (25th–75th percentile, HYDAT) Last 7 days
Provisional real-time data, subject to revision. hydrometric station 02EB020
Sun and moon
- Civil dawn
- 6:57 a.m.
- Sunrise
- 7:26 a.m.
- Sunset
- 6:43 p.m.
- Civil dusk
- 7:13 p.m.
- Moonrise
- 6:18 a.m.
- Moonset
- 6:02 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Parry Sound, as of 9:00 a.m. EDT
Depth
8% of Lake Rosseau is shallower than 3 m, and 12% is deeper than 50 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 2002 records a maximum depth of 89 m, drawn from 4,593 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 55 government surveys (1971–2021) that recorded them.
Forage fish and other species (14)
Forage fish
- Creek Chub 3
- Rainbow Smelt 3
- Spottail Shiner 3
- Bluntnose Minnow 2
- Logperch 2
- Spotfin Shiner 2
- Brook Stickleback 1
- Central Mudminnow 1
- Central Stoneroller 1
- Common Shiner 1
- Golden Shiner 1
Other
- Brown Bullhead 4
- White Sucker 3
- Margined Madtom 2
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 9 species from Lake Rosseau. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | 50-55 cm | 8 | Do not eat | Mercury, PFAS |
| Lake Whitefish | 45-50 cm | 4 | 4 | PFAS |
| Northern Pike | 55-60 cm | 12 | 4 | Mercury |
| Rock Bass | 15-20 cm | 12 | 4 | Mercury |
| Smallmouth Bass | 35-40 cm | 4 | Do not eat | PFAS |
| Walleye | 40-45 cm | 4 | 4 | PFAS |
| Burbot (Ling) | 50-55 cm | 4 | Do not eat | Mercury |
| Cisco (Lake Herring) | 30-35 cm | 8 | 4 | Mercury |
| Rainbow Smelt | 15-20 cm | 4 | 4 | PFAS |
* 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 15. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 26 years between 1995 and 2025; the latest annual mean is 4 m.
Getting on the water
11 listed access points, 5 of them boat launches; 3 with parking listed. marks launches on the map.
North shore
- Lake Rosseau - Gull Rock
- Lake Rosseau - Skeleton Bay
East shore
- Lake Rosseau - Maple Leaf Bay, Windermere
- Lake Rosseau - Portage Bay
- Lake Rosseau - Windermere Park
Southeast shore
- Lake Rosseau - Adams Bay
- Lake Rosseau - Boyce Road
- Lake Rosseau - Dock Road, Brackenrig
West shore
- Lake Rosseau - Morinus Road
Northwest shore
- Lake Rosseau - Rosseau
- Sucker Lake