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Map of Percy Lake with depth contours

Percy Lake

45.2079° N, 78.3604° W

Depth contours from the 1970 government survey. Not for navigation.

Download the depth map (SVG)

Percy Lake, Ontario. 45.2079° N, 78.3604° W

Maximum depth 30.5 m (1970 survey). Scale bar on the map.

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/percy-lake-near-fort-irwin/, 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.
  • 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.

Percy Lake is 30.5 m deep at its deepest point, deeper than 79% of the 2,688 surveyed lakes in Ontario. It covers 5.35 km² and lies 4.4 km northeast of Fort Irwin.

Maximum depth
30.5 msurveyed 1970
deeper than 79% of the 2,688 surveyed lakes in Ontario
Area
5.35 km²
larger than 92% of the 18,731 lakes in Ontario
Shoreline
23.5 km
longer than 90% of the 18,731 lakes in Ontario
Water clarity
5 mSecchi depth, 2025
clearer than 81% of the 1,251 monitored lakes in Ontario
Elevation
374 m

Today on the water

5.5 °C

Wind NW 4 km/h

Observed at Haliburton, 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.) m0.20.20.20.30.3
Temp. °C3591213830
Precip. %2040402020000

Tonight: Partly cloudy. 60 percent chance of showers this evening. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 3.

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

Sun and moon

Civil dawn
6:52 a.m.
Sunrise
7:21 a.m.
Sunset
6:38 p.m.
Civil dusk
7:08 p.m.
Moonrise
6:13 a.m.
Moonset
5:57 p.m.
Moon
Waning crescent, 1% lit

Air Quality Health Index

2 low risk

Dorset, 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.

Depth

54% of Percy Lake 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 1970 records a maximum depth of 30.5 m, drawn from 24 depth contours.

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 Depths are from government surveys and may be outdated.

Water

Clarity was measured with a Secchi disk in 20 years between 1995 and 2025; the latest annual mean is 5 m.

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

Getting on the water

1 listed boat launch; 1 with parking listed. marks launches on the map.