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Map of Mill Lake

Mill Lake

45.3695° N, 79.9973° W

Shoreline and neighbouring water from open government data.

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Mill Lake, Ontario. 45.3695° N, 79.9973° W

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/mill-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.
  • 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).
  • 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.

Mill Lake covers 6.35 km², making it larger than 93% of the 18,731 lakes in Ontario. It lies 1.8 km northeast of Parry Sound.

Government surveys have recorded 8 fish species here, including smallmouth bass, walleye and cisco.

Area
6.35 km²
larger than 93% of the 18,731 lakes in Ontario
Shoreline
34.9 km
longer than 93% of the 18,731 lakes in Ontario
Water clarity
2.6 mSecchi depth, 2018
less clear than 72% of the 1,251 monitored lakes in Ontario
Fish species
8
more than 65% of the 2,454 surveyed lakes in Ontario
Elevation
192 m

Today on the water

9.2 °C

Observed at Parry Sound, as of 4:00 a.m. EDT

choppy Estimated waves, next 12 hours: up to 0.3 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.

Time5 a.m.8 a.m.11 a.m.2 p.m.5 p.m.8 p.m.11 p.m.2 a.m.
Wind km/hW 15W 15W 15NW 30NW 30NW 15var. 5var. 5
Gusts km/h5050
Waves (est.) m0.20.20.20.3
Temp. °C57101314953
Precip. %4040402020000

Tonight: Partly cloudy with 60 percent chance of showers. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 5.

Weather: Parry Sound (local forecast), as of 4:02 a.m. EDT

Sun and moon

Civil dawn
6:58 a.m.
Sunrise
7:28 a.m.
Sunset
6:45 p.m.
Civil dusk
7:14 p.m.
Moonrise
6:20 a.m.
Moonset
6:03 p.m.
Moon
Waning crescent, 1% lit

Air Quality Health Index

1 low risk

Parry Sound, as of 4:00 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 3 government surveys (2015–2015) that recorded them.

  • Smallmouth Bass3 of 3
  • Walleye3 of 3
  • Cisco2 of 3
  • Lake Whitefish2 of 3
  • Northern Pike2 of 3
  • Rock Bass1 of 3
Other species (2)
  • White Sucker 3
  • Brown Bullhead 1

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 6 species from Mill Lake. Maximum meals per month:

SpeciesLengthGeneral populationSensitive population*Contaminant
Lake Whitefish45-50 cm164Mercury, PCB
Northern Pike55-60 cm4Do not eatMercury
Smallmouth Bass35-40 cm4Do not eatMercury
Walleye40-45 cm4Do not eatMercury
Cisco (Lake Herring)30-35 cm164Mercury
White Sucker40-45 cm168Mercury

* 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 9 years between 2007 and 2018; the latest annual mean is 2.6 m.

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

Getting on the water

2 listed boat launches; 2 with parking listed. marks launches on the map.