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Map of Lake Muskoka

Lake Muskoka

45.0237° N, 79.4773° W

Shoreline and neighbouring water from open government data.

Download the map (SVG)

Lake Muskoka, Ontario. 45.0237° N, 79.4773° W

Not for navigation. Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/lake-muskoka/, 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.
  • 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.
  • Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.

Lake Muskoka covers 122 km², making it larger than 99% of the 18,731 lakes in Ontario. It lies beside West Gravenhurst.

Government surveys have recorded 29 fish species here, including rock bass, smallmouth bass and yellow perch.

Area
122 km²
larger than 99% of the 18,731 lakes in Ontario
Shoreline
394 km
longer than 99% of the 18,731 lakes in Ontario
Water clarity
3.1 mSecchi depth, 2025
less clear than 58% of the 1,251 monitored lakes in Ontario
Fish species
29
more than 99% of the 2,454 surveyed lakes in Ontario
Elevation
223 m

Today on the water

8.2 °C

Mostly CloudyWind NNW 11 km/h

Observed at Gravenhurst, as of 3:00 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.

Time4 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/hW 15W 15W 15NW 30NW 30NW 15var. 5var. 5
Gusts km/h5050
Waves (est.) m0.20.20.20.50.5
Temp. °C45812141163
Precip. %40404040202000

Tonight: Partly cloudy with 60 percent chance of showers. Risk of a thunderstorm early this evening. Wind northwest 30 km/h gusting to 50 becoming light this evening. Low plus 4.

Weather: Gravenhurst (local forecast), as of 3:02 a.m. EDT

Water level

Lake Muskoka at Beaumaris: 9.32 m at 2:45 a.m. EDT: 4 cm below the median for this time of year, below the normal range.

9.449.32

Normal range (25th–75th percentile, HYDAT) Last 7 days

Provisional real-time data, subject to revision. hydrometric station 02EB018

Sun and moon

Civil dawn
6:56 a.m.
Sunrise
7:26 a.m.
Sunset
6:43 p.m.
Civil dusk
7:12 p.m.
Moonrise
6:18 a.m.
Moonset
6:02 p.m.
Moon
Waning crescent, 1% lit

Air Quality Health Index

2 low risk

Dorset, as of 3:00 a.m. EDT

Data Source: Environment and Climate Change Canada. Local times.

How waves are estimated

Significant wave height from the forecast hourly wind and the open-water distance (fetch) upwind, using the SMB method (US Army Corps of Engineers Shore Protection Manual, 1984), rounded up to the next 0.1 m. It is not a measurement: gusts, leftover swell and shoals can make water rougher. Under 0.2 m: calm; 0.2–0.5 m: choppy; over 0.5 m: rough.

Fish

Sport fish by the share of the 130 government surveys (1978–2019) that recorded them.

  • Rock Bass73 of 130
  • Smallmouth Bass71 of 130
  • Yellow Perch43 of 130
  • Walleye42 of 130
  • Lake Trout23 of 130
  • Northern Pike20 of 130
  • Pumpkinseed16 of 130
  • Burbot9 of 130
  • Cisco2 of 130
  • Brook Trout1 of 130Not recorded since 1978
  • Lake Whitefish1 of 130
Forage fish and other species (18)

Forage fish

  • Rainbow Smelt 24
  • Trout-Perch 14
  • Spottail Shiner 9
  • Slimy Sculpin 4
  • Creek Chub 3
  • Bluntnose Minnow 2
  • Spoonhead Sculpin 2
  • Spotfin Shiner 2
  • Central Mudminnow 1
  • Common Shiner 1
  • Emerald Shiner 1
  • Golden Shiner 1
  • Hornyhead Chub 1
  • Mottled Sculpin 1
  • Ninespine Stickleback 1
  • Northern Redbelly Dace 1

Other

  • Brown Bullhead 10
  • White Sucker 3

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 10 species from Lake Muskoka. Maximum meals per month:

SpeciesLengthGeneral populationSensitive population*Contaminant
Black Crappie25-30 cm44PFAS
Lake Trout50-55 cm4Do not eatMercury, PFAS
Lake Whitefish55-60 cm88PFAS
Northern Pike55-60 cm44PFAS
Rock Bass15-20 cm84PFAS
Smallmouth Bass35-40 cm2Do not eatPFAS
Walleye40-45 cm4Do not eatPFAS
Yellow Perch20-25 cm84Mercury
Brown Bullhead25-30 cm1616Lead
Cisco (Lake Herring)30-35 cm44PFAS

* 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 33 years between 1992 and 2025; the latest annual mean is 3.1 m.

Water clarity (Secchi depth, m)
Total phosphorus (µg/L)

Getting on the water

26 listed access points, 16 of them boat launches; 16 with parking listed. marks launches on the map.

North shore

Northeast shore

East shore

Southeast shore

Southwest shore

West shore

2 more on the west shore

Northwest shore

Near Barlochan

Near Walkers Point

Photos

Lake Muskoka (30578595152)
Photo: Erin Brierley, CC BY-SA 2.0, via Wikimedia Commons
Lake Muskoka
Photo: WookieInHeat ( talk ), CC BY-SA 3.0, via Wikimedia Commons
Sunset Lake Muskoka
Photo: Gracieleruiz, CC BY-SA 4.0, via Wikimedia Commons