Greenwater Lake
48.5745° N, 90.43° W
Depth contours from the 1968 government survey. Not for navigation.
Download the depth map (SVG)Greenwater Lake, Ontario. 48.5745° N, 90.43° W
Maximum depth 54 m (1968 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/greenwater-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.
- 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).
- Guide to Eating Ontario Fish: Advisory Database, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
Greenwater Lake is 54 m deep at its deepest point, deeper than 95% of the 2,688 surveyed lakes in Ontario. It covers 34.3 km² and lies 4.5 km southeast of Kashabowie.
Government surveys have recorded 13 fish species here, including lake trout, lake whitefish and burbot.
- Maximum depth
- 54 msurveyed 1968
- deeper than 95% of the 2,688 surveyed lakes in Ontario
- Area
- 34.3 km²
- larger than 98% of the 18,731 lakes in Ontario
- Shoreline
- 86.6 km
- longer than 98% of the 18,731 lakes in Ontario
- Water clarity
- 4.6 mSecchi depth, 2024
- clearer than 73% of the 1,251 monitored lakes in Ontario
- Fish species
- 13
- more than 86% of the 2,454 surveyed lakes in Ontario
- Elevation
- 454 m
Today on the water
-2.5 °C
Observed at Upsala, as of 5:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.3 m. Around 11 a.m., wind from the south: the south shore is sheltered, waves build toward the north shore.
| Time | 6 a.m. | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. | 3 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | var. 5 | S 20 | SE 20 | SE 20 | SE 20 | SE 20 | SE 20 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.1 | 0.3 | 0.3 | 0.3 | |||
| Temp. °C | -1 | 1 | 9 | 14 | 13 | 11 | 10 | 9 |
| Precip. % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Tonight: Partly cloudy with 40 percent chance of showers early this evening then clear. Wind northwest 20 km/h becoming light this evening. Low minus 2.
Weather: Upsala (local forecast), as of 5:00 a.m. EDT
Sun and moon
- Civil dawn
- 7:41 a.m.
- Sunrise
- 8:13 a.m.
- Sunset
- 7:24 p.m.
- Civil dusk
- 7:55 p.m.
- Moonrise
- 7:06 a.m.
- Moonset
- 6:43 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
14% of Greenwater Lake is shallower than 3 m, and 18% is deeper than 30 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 1968 records a maximum depth of 54 m, drawn from 297 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.
Fish
Sport fish by the share of the 60 government surveys (2007–2013) that recorded them.
Forage fish and other species (7)
Forage fish
- Trout-Perch 9
- Lake Chub 8
- Spottail Shiner 7
- Blacknose Shiner 4
- Blacknose Dace 2
- Northern Pearl Dace 2
Other
- White Sucker 18
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 7 species from Greenwater Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | 50-55 cm | 8 | 4 | Mercury |
| Lake Whitefish | 45-50 cm | 16 | 16 | PCB |
| Northern Pike | 55-60 cm | 16 | 12 | Precautionary |
| Yellow Perch | 15-20 cm | 16 | 8 | Mercury |
| Burbot (Ling) | 50-55 cm | 8 | 4 | Mercury |
| Cisco (Lake Herring) | 25-30 cm | 16 | 8 | Mercury |
| White Sucker | 30-35 cm | 16 | 16 | Precautionary |
* 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 6. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 2 years between 2018 and 2024; the latest annual mean is 4.6 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.