BorealBoundFrançais
Map of Mountain Lake with depth contours

Mountain Lake

47.2308° N, 79.8322° W

Depth contours from the 1974 government survey. Not for navigation.

Download the depth map (SVG)

Mountain Lake, Ontario. 47.2308° N, 79.8322° W

Maximum depth 36.6 m (1974 survey). Scale bar on the map.

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/mountain-lake-near-latchford/, 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.
  • 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.

Mountain Lake is 36.6 m deep at its deepest point, deeper than 85% of the 2,688 surveyed lakes in Ontario. It covers 2.23 km² and lies 9.7 km south of Latchford.

Government surveys have recorded 11 fish species here, including lake whitefish, lake trout and rock bass.

Maximum depth
36.6 msurveyed 1974
deeper than 85% of the 2,688 surveyed lakes in Ontario
Area
2.23 km²
larger than 83% of the 18,731 lakes in Ontario
Shoreline
22.4 km
longer than 89% of the 18,731 lakes in Ontario
Fish species
11
more than 77% of the 2,454 surveyed lakes in Ontario
Elevation
317 m

Today on the water

4.1 °C

CloudyWind WSW 11 km/h

Observed at Temiskaming Shores, as of 4:00 a.m. EDT

choppy Estimated waves, next 12 hours: up to 0.2 m. Around 8 a.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 10NW 20NW 20NW 20NW 20var. 5SE 10S 10
Gusts km/h4040
Waves (est.) m0.10.20.20.20.2
Temp. °C346101262-1
Precip. %3030202020000

Tonight: Mainly cloudy with 30 percent chance of showers. Wind west 20 km/h gusting to 40 becoming light this evening. Wind becoming west 20 after midnight. Low plus 3.

Weather: Temiskaming Shores (local forecast), as of 4:01 a.m. EDT

Sun and moon

Civil dawn
6:58 a.m.
Sunrise
7:29 a.m.
Sunset
6:42 p.m.
Civil dusk
7:13 p.m.
Moonrise
6:20 a.m.
Moonset
6:01 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

17% of Mountain Lake is deeper than 20 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 1974 records a maximum depth of 36.6 m, drawn from 43 depth contours.

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 Depths are from government surveys and may be outdated.

Fish

Sport fish by the share of the 24 government surveys (2014–2014) that recorded them.

  • Lake Whitefish18 of 24
  • Lake Trout11 of 24
  • Rock Bass7 of 24
  • Smallmouth Bass7 of 24
  • Burbot6 of 24
  • Yellow Perch6 of 24
  • Northern Pike1 of 24
Forage fish and other species (4)

Forage fish

  • Logperch 5
  • Bluntnose Minnow 3
  • Common Shiner 3

Other

  • White Sucker 10

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 3 species from Mountain Lake. Maximum meals per month:

SpeciesLengthGeneral populationSensitive population*Contaminant
Lake Trout50-55 cm124Mercury
Northern Pike55-60 cm84Mercury
Smallmouth Bass35-40 cm8Do not eatMercury

* 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 11. Check seasons and limits before you fish.