The Big Lake
45.6945° N, 80.0353° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)The Big Lake, Ontario. 45.6945° N, 80.0353° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/the-big-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.
- 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.
- 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).
- Ontario Waterbody Location Identifier, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
The Big Lake covers 8.05 km², making it larger than 94% of the 18,731 lakes in Ontario. It lies 1.6 km west of Whitestone.
- Area
- 8.05 km²
- larger than 94% of the 18,731 lakes in Ontario
- Shoreline
- 39.8 km
- longer than 94% of the 18,731 lakes in Ontario
- Water clarity
- 3.6 mSecchi depth, 2025
- clearer than 52% of the 1,251 monitored lakes in Ontario
- Elevation
- 222 m
Today on the water
9.8 °C
Observed at Dunchurch, 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.
| Time | 4 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/h | W 15 | W 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | |||
| Temp. °C | 4 | 5 | 8 | 12 | 14 | 10 | 5 | 3 |
| Precip. % | 40 | 40 | 40 | 40 | 20 | 20 | 0 | 0 |
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 4.
Weather: Dunchurch (local forecast), as of 3:00 a.m. EDT
Sun and moon
- Civil dawn
- 6:59 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
2 low risk
Parry Sound, as of 3:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Water
Clarity was measured with a Secchi disk in 18 years between 2002 and 2025; the latest annual mean is 3.6 m.
Getting on the water
1 listed boat launch. marks launches on the map.
- Wahwashkesh Lake - Parker Bay Road
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.