Flatt Lake
49.2037° N, 83.0657° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Flatt Lake, Ontario. 49.2037° N, 83.0657° W
Maximum depth 3 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/flatt-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.
- Fisheries Management Zones, Ontario Ministry of Natural Resources. 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.
Flatt Lake is 3 m deep at its deepest point, shallower than 96% of the 2,688 surveyed lakes in Ontario. It covers 1.15 km² and lies 38 km south of Opasatika.
- Maximum depth
- 3 m
- shallower than 96% of the 2,688 surveyed lakes in Ontario
- Area
- 1.15 km²
- larger than 70% of the 18,731 lakes in Ontario
- Shoreline
- 4.9 km
- shorter than 52% of the 18,731 lakes in Ontario
- Elevation
- 263 m
Today on the water
0.4 °C
Observed at Hearst, as of 8:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 11 a.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.
| Time | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. | 3 a.m. | 6 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | NW 20 | NW 20 | NW 20 | var. 5 | var. 5 | var. 5 | var. 5 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | |||
| Temp. °C | 2 | 4 | 7 | 7 | 5 | 1 | 0 | 0 |
| Precip. % | 0 | 0 | 0 | 20 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud. 30 percent chance of showers early this morning. Wind becoming northwest 20 km/h gusting to 40 late this morning. High 8. UV index 3 or moderate.
Weather: Hearst (local forecast), as of 8:03 a.m. EDT
Sun and moon
- Civil dawn
- 7:12 a.m.
- Sunrise
- 7:44 a.m.
- Sunset
- 6:54 p.m.
- Civil dusk
- 7:25 p.m.
- Moonrise
- 6:35 a.m.
- Moonset
- 6:12 p.m.
- Moon
- Waning crescent, 1% lit
Depth
The government depth survey records a maximum depth of 3 m, drawn from 3 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
Not for navigation. Depths are from government surveys and may be outdated.