Obonga Lake
49.9741° N, 89.3113° W
Depth contours from the 1971 government survey. Not for navigation.
Download the depth map (SVG)Obonga Lake, Ontario. 49.9741° N, 89.3113° W
Maximum depth 67.1 m (1971 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/obonga-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.
- 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.
Obonga Lake is 67.1 m deep at its deepest point, deeper than 97% of the 2,688 surveyed lakes in Ontario. It covers 37.4 km² and lies 30 km southwest of Armstrong.
Government surveys have recorded 14 fish species here, including walleye, burbot and northern pike.
- Maximum depth
- 67.1 msurveyed 1971
- deeper than 97% of the 2,688 surveyed lakes in Ontario
- Area
- 37.4 km²
- larger than 98% of the 18,731 lakes in Ontario
- Shoreline
- 103 km
- longer than 98% of the 18,731 lakes in Ontario
- Fish species
- 14
- more than 86% of the 2,454 surveyed lakes in Ontario
- Elevation
- 293 m
Today on the water
-0.8 °C
Observed at Gull Bay, as of 3:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 4 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 4 a.m. | 7 a.m. | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 10 | SW 10 | SE 10 | SE 15 | S 15 | S 20 | SE 30 |
| Gusts km/h | 40 | 50 | ||||||
| Waves (est.) m | 0.2 | 0.1 | 0.2 | 0.1 | ||||
| Temp. °C | 4 | 2 | 5 | 9 | 12 | 11 | 9 | 8 |
| Precip. % | 20 | 20 | 20 | 20 | 40 | 40 | 40 | 40 |
Tonight: Mainly cloudy. 30 percent chance of showers early this evening. Clearing near midnight. Wind north 20 km/h gusting to 40 becoming light this evening. Low plus 2.
Weather: Gull Bay (local forecast), as of 3:02 a.m. EDT
Sun and moon
- Civil dawn
- 7:37 a.m.
- Sunrise
- 8:09 a.m.
- Sunset
- 7:18 p.m.
- Civil dusk
- 7:50 p.m.
- Moonrise
- 7:02 a.m.
- Moonset
- 6:37 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
17% of Obonga Lake 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 1971 records a maximum depth of 67.1 m, drawn from 54 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 38 government surveys (2008–2013) that recorded them.
Forage fish and other species (6)
Forage fish
- Spottail Shiner 4
- Emerald Shiner 3
- Trout-Perch 3
- Spoonhead Sculpin 2
Other
- White Sucker 12
- Longnose Sucker 9
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 7 species from Obonga Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | >75 cm | Do not eat | Do not eat | Mercury, PCB |
| Lake Whitefish | 45-50 cm | 8 | 8 | Arsenic |
| Northern Pike | 55-60 cm | 4 | Do not eat | Mercury |
| Walleye | 40-45 cm | 4 | Do not eat | Mercury |
| Burbot (Ling) | 50-55 cm | 4 | Do not eat | Mercury |
| Longnose Sucker | 45-50 cm | 4 | Do not eat | Mercury |
| White Sucker | 40-45 cm | 16 | 12 | PCB |
* 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.
Getting on the water
2 listed boat launches; 2 with parking listed. marks launches on the map.
Northeast end
- Obonga Lake East Access
Southeast shore
- Obonga Lake West Access
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.