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Map of Third Depot Lake

Third Depot Lake

44.5694° N, 76.7878° W

Shoreline and neighbouring water from open government data.

Download the map (SVG)

Third Depot Lake, Ontario. 44.5694° N, 76.7878° W

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/third-depot-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.
  • 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.

Third Depot Lake covers 0.87 km², making it larger than 64% of the 18,731 lakes in Ontario. It lies 3.1 km west of Oak Flats.

Government surveys have recorded 10 fish species here, including rock bass, yellow perch and bluegill.

Area
0.87 km²
larger than 64% of the 18,731 lakes in Ontario
Shoreline
9.8 km
longer than 73% of the 18,731 lakes in Ontario
Fish species
10
more than 73% of the 2,454 surveyed lakes in Ontario
Elevation
167 m

Today on the water

10.2 °C

Mainly ClearWind WSW 13 km/h

Observed at Sydenham, as of 3:00 a.m. EDT

choppy Estimated waves, next 12 hours: up to 0.2 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.) m0.10.10.10.20.2
Temp. °C561013151272
Precip. %20404040202000

Tonight: Partly cloudy. 40 percent chance of showers this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 5.

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

Sun and moon

Civil dawn
6:45 a.m.
Sunrise
7:14 a.m.
Sunset
6:33 p.m.
Civil dusk
7:02 p.m.
Moonrise
6:06 a.m.
Moonset
5:51 p.m.
Moon
Waning crescent, 1% lit

Air Quality Health Index

2 low risk

Kingston, 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 3 government surveys that recorded them.

  • Rock Bass3 of 3
  • Yellow Perch3 of 3
  • Bluegill2 of 3
  • Largemouth Bass2 of 3
  • Pumpkinseed2 of 3
  • Walleye2 of 3
Forage fish and other species (4)

Forage fish

  • Bluntnose Minnow 2
  • Golden Shiner 1

Other

  • Brown Bullhead 1
  • Yellow Bullhead 1

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 3 species from Third Depot Lake. Maximum meals per month:

SpeciesLengthGeneral populationSensitive population*Contaminant
Largemouth Bass25-30 cm164Mercury
Northern Pike55-60 cm4Do not eatMercury
Walleye40-45 cm4Do not eatMercury

* 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 18. Check seasons and limits before you fish.