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Map of Sup Lake with depth contours

Sup Lake

50.3052° N, 93.558° W

Depth contours from the government survey. Not for navigation.

Download the depth map (SVG)

Sup Lake, Ontario. 50.3052° N, 93.558° W

Maximum depth 18.3 m. Scale bar on the map.

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 Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/sup-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.
  • 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.

Sup Lake is 18.3 m deep at its deepest point, deeper than 54% of the 2,688 surveyed lakes in Ontario. It covers 6.78 km² and lies 27 km west of Perrault Falls.

Government surveys have recorded 9 fish species here, including northern pike, yellow perch and walleye.

Maximum depth
18.3 m
deeper than 54% of the 2,688 surveyed lakes in Ontario
Area
6.78 km²
larger than 93% of the 18,731 lakes in Ontario
Shoreline
20.3 km
longer than 88% of the 18,731 lakes in Ontario
Fish species
9
more than 69% of the 2,454 surveyed lakes in Ontario
Elevation
358 m

Today on the water

0.6 °C

Wind ENE 2 km/h

Observed at Ear Falls, as of 4:00 a.m. CDT

choppy Estimated waves, next 12 hours: up to 0.3 m. Around 4 p.m., wind from the southeast: the southeast shore is sheltered, waves build toward the northwest 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/hS 10S 10S 20E 10SE 30SE 30SE 30SE 20
Gusts km/h50505040
Waves (est.) m0.10.10.20.10.3
Temp. °C13810111098
Precip. %2020206060601010

Tonight: A few clouds. Wind northwest 20 km/h gusting to 40 becoming light this evening. Low plus 1.

Weather: Ear Falls (local forecast), as of 4:02 a.m. CDT

Sun and moon

Civil dawn
6:54 a.m.
Sunrise
7:27 a.m.
Sunset
6:34 p.m.
Civil dusk
7:07 p.m.
Moonrise
6:20 a.m.
Moonset
5:53 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 Sup Lake is shallower than 3 m, and 37% 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 18.3 m, drawn from 11 depth contours.

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 Depths are from government surveys and may be outdated.

Fish

Sport fish by the share of the 19 government surveys (2009–2009) that recorded them.

  • Northern Pike18 of 19
  • Yellow Perch15 of 19
  • Walleye12 of 19
  • Cisco10 of 19
  • Lake Whitefish10 of 19
Forage fish and other species (4)

Forage fish

  • Spottail Shiner 5
  • Brook Stickleback 2
  • Trout-Perch 2

Other

  • White Sucker 12

Numbers are the surveys that recorded each species.

Eating your catch

The provincial guide to eating fish (2026) sets limits for 4 species from Sup Lake. Maximum meals per month:

SpeciesLengthGeneral populationSensitive population*Contaminant
Lake Whitefish45-50 cm1616Precautionary
Northern Pike55-60 cm8Do not eatMercury
Walleye40-45 cm84Mercury
White Sucker40-45 cm1616Precautionary

* 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 4. Check seasons and limits before you fish.