Onaman Lake
50.0078° N, 87.4485° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Onaman Lake, Ontario. 50.0078° N, 87.4485° W
Maximum depth 15.2 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/onaman-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.
- 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.
- 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.
Onaman Lake is 15.2 m deep at its deepest point, shallower than 55% of the 2,688 surveyed lakes in Ontario. It covers 111 km² and lies 21 km southwest of Kowkash.
Government surveys have recorded 11 fish species here, including walleye, yellow perch and lake whitefish.
- Maximum depth
- 15.2 m
- shallower than 55% of the 2,688 surveyed lakes in Ontario
- Area
- 111 km²
- larger than 99% of the 18,731 lakes in Ontario
- Shoreline
- 217 km
- longer than 99% of the 18,731 lakes in Ontario
- Fish species
- 11
- more than 77% of the 2,454 surveyed lakes in Ontario
- Elevation
- 334 m
Today on the water
1 °C
Observed at Greenstone (Nakina), as of 9:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.3 m. Around 11 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. | 4 a.m. | 7 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | W 20 | W 20 | var. 5 | SE 10 | S 10 | SE 10 | SE 20 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.3 | 0.3 | 0.1 | ||||
| Temp. °C | 4 | 8 | 10 | 8 | 6 | 5 | 3 | 2 |
| Precip. % | 0 | 0 | 0 | 0 | 0 | 40 | 40 | 40 |
Today: A mix of sun and cloud. Wind becoming west 20 km/h gusting to 40 late this morning. High 10. UV index 2 or low.
Weather: Greenstone (Nakina) (local forecast), as of 9:02 a.m. EDT
Sun and moon
- Civil dawn
- 7:30 a.m.
- Sunrise
- 8:02 a.m.
- Sunset
- 7:10 p.m.
- Civil dusk
- 7:43 p.m.
- Moonrise
- 6:54 a.m.
- Moonset
- 6:29 p.m.
- Moon
- Waning crescent, 1% lit
Depth
The government depth survey records a maximum depth of 15.2 m, drawn from 69 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 44 government surveys (2011–2011) that recorded them.
Forage fish and other species (7)
Forage fish
- Spottail Shiner 24
- Trout-Perch 15
- Emerald Shiner 7
- Logperch 6
- Ninespine Stickleback 1
Other
- White Sucker 22
- Shorthead Redhorse 2
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 4 species from Onaman Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Whitefish | 45-50 cm | 16 | 16 | Precautionary |
| Northern Pike | 55-60 cm | 16 | 4 | Mercury |
| Walleye | 40-45 cm | 16 | 4 | Mercury |
| White Sucker | 45-50 cm | 16 | 12 | 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 7. Check seasons and limits before you fish.
Getting on the water
3 listed boat launches. marks launches on the map.
Southwest end
- Onaman Lake Access Point
- Onaman Lake Access Point
Northwest shore
- Boat launch