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Map of Lake St. Peter with depth contours

Lake St. Peter

45.3119° N, 78.0233° W

Depth contours from the 1967 government survey. Not for navigation.

Download the depth map (SVG)

Lake St. Peter, Ontario. 45.3119° N, 78.0233° W

Maximum depth 27.4 m (1967 survey). Scale bar on the map.

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/lake-st-peter/, 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.
  • 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).
  • 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 St. Peter is 27.4 m deep at its deepest point, deeper than 74% of the 2,688 surveyed lakes in Ontario. It covers 2.37 km² and lies 6 km south of McKenzie Lake.

Government surveys have recorded 5 fish species here, including lake trout, brook trout and rock bass.

Maximum depth
27.4 msurveyed 1967
deeper than 74% of the 2,688 surveyed lakes in Ontario
Area
2.37 km²
larger than 83% of the 18,731 lakes in Ontario
Shoreline
14.8 km
longer than 83% of the 18,731 lakes in Ontario
Water clarity
2.3 mSecchi depth, 2025
less clear than 79% of the 1,251 monitored lakes in Ontario
Fish species
5
more than 53% of the 2,454 surveyed lakes in Ontario
Elevation
396 m

Today on the water

4.8 °C

Wind W 4 km/h

Observed at Algonquin Park (Brent), as of 3:00 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.

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.) m0.10.10.10.3
Temp. °C1261012940
Precip. %40404040202000

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 1.

Weather: Algonquin Park (Brent) (local forecast), as of 3:03 a.m. EDT

Sun and moon

Civil dawn
6:50 a.m.
Sunrise
7:20 a.m.
Sunset
6:37 p.m.
Civil dusk
7:06 p.m.
Moonrise
6:12 a.m.
Moonset
5:55 p.m.
Moon
Waning crescent, 1% lit

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

32% of Lake St. Peter 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 1967 records a maximum depth of 27.4 m, drawn from 27 depth contours.

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 Depths are from government surveys and may be outdated.

Fish

Sport fish by the share of the 8 government surveys (1899–1899) that recorded them.

  • Lake Trout4 of 8
  • Brook Trout1 of 8
  • Rock Bass1 of 8
  • Smallmouth Bass1 of 8
Other species (1)
  • White Sucker 5

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 1 species from Lake St. Peter. Maximum meals per month:

SpeciesLengthGeneral populationSensitive population*Contaminant
Lake Trout50-55 cm124Mercury

* 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 11 years between 2015 and 2025; the latest annual mean is 2.3 m.

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

Photos

Lake St Peter (47546451)
Photo: Rick Harris from Toronto, Ontario, Canada, CC BY-SA 2.0, via Wikimedia Commons
Lake St Peter (early morning) (47546702)
Photo: Rick Harris from Toronto, Ontario, Canada, CC BY-SA 2.0, via Wikimedia Commons
Lake St. Peter (1524332059)
Photo: Rick Harris from Toronto, Ontario, Canada, CC BY-SA 2.0, via Wikimedia Commons