Mountain Lake
44.9828° N, 78.7078° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Mountain Lake, Ontario. 44.9828° N, 78.7078° W
Maximum depth 30.5 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/mountain-lake-near-minden/, 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).
Mountain Lake is 30.5 m deep at its deepest point, deeper than 79% of the 2,688 surveyed lakes in Ontario. It covers 3.22 km² and lies 4.5 km north of Minden.
- Maximum depth
- 30.5 m
- deeper than 79% of the 2,688 surveyed lakes in Ontario
- Area
- 3.22 km²
- larger than 87% of the 18,731 lakes in Ontario
- Shoreline
- 13 km
- longer than 80% of the 18,731 lakes in Ontario
- Water clarity
- 5 mSecchi depth, 2010
- clearer than 79% of the 1,251 monitored lakes in Ontario
- Elevation
- 304 m
Today on the water
9.1 °C
Observed at Oxtongue Lake, as of 10:00 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 | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. | 5 a.m. | 8 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 | SE 10 | SE 10 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.1 | 0.3 | 0.3 | 0.2 | ||||
| Temp. °C | 8 | 12 | 13 | 8 | 2 | -2 | -3 | -1 |
| Precip. % | 40 | 20 | 20 | 0 | 0 | 0 | 0 | 0 |
Today: A mix of sun and cloud. 40 percent chance of showers this morning and early this afternoon. Wind becoming northwest 30 km/h gusting to 50 near noon. High 13. UV index 4 or moderate.
Weather: Oxtongue Lake (local forecast), as of 10:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:53 a.m.
- Sunrise
- 7:22 a.m.
- Sunset
- 6:40 p.m.
- Civil dusk
- 7:09 p.m.
- Moonrise
- 6:15 a.m.
- Moonset
- 5:58 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Dorset, as of 9:00 a.m. EDT
Depth
12% of Mountain Lake is shallower than 3 m, and 61% 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 records a maximum depth of 30.5 m, drawn from 9 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.
Water
Clarity was measured with a Secchi disk in 17 years between 1992 and 2010; the latest annual mean is 5 m.
Getting on the water
1 listed boat launch. marks launches on the map.
- Boat launch