Union Lake
48.828° N, 90.9705° W
Depth contours from the government survey. Not for navigation.
Download the depth map (SVG)Union Lake, Ontario. 48.828° N, 90.9705° W
Maximum depth 14 m. Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/union-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.
Union Lake is 14 m deep at its deepest point, shallower than 58% of the 2,688 surveyed lakes in Ontario. It covers 2.78 km² and lies 11 km northwest of Quetico.
Government surveys have recorded 7 fish species here, including walleye, yellow perch and northern pike.
- Maximum depth
- 14 m
- shallower than 58% of the 2,688 surveyed lakes in Ontario
- Area
- 2.78 km²
- larger than 85% of the 18,731 lakes in Ontario
- Shoreline
- 18.5 km
- longer than 86% of the 18,731 lakes in Ontario
- Fish species
- 7
- more than 61% of the 2,454 surveyed lakes in Ontario
- Elevation
- 448 m
Today on the water
-2.3 °C
Observed at Upsala, as of 6:00 a.m. EST
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 7 p.m., wind from the southeast: the southeast shore is sheltered, waves build toward the northwest shore.
| Time | 7 a.m. | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. | 4 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | var. 5 | var. 5 | SE 10 | SE 10 | SE 20 | SE 20 | SE 20 | SE 20 |
| Gusts km/h | 40 | 40 | 40 | 40 | ||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | |||
| Temp. °C | -1 | 7 | 13 | 14 | 12 | 9 | 7 | 9 |
| Precip. % | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Today: Clear. Becoming a mix of sun and cloud this morning. Wind up to 15 km/h. High 14. Wind chill minus 5 this morning. UV index 3 or moderate.
Weather: Upsala (local forecast), as of 6:02 a.m. EST
Sun and moon
- Civil dawn
- 6:43 a.m.
- Sunrise
- 7:15 a.m.
- Sunset
- 6:25 p.m.
- Civil dusk
- 6:57 p.m.
- Moonrise
- 6:08 a.m.
- Moonset
- 5:44 p.m.
- Moon
- Waning crescent, 1% lit
Depth
32% of Union Lake is deeper than 5 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 14 m, drawn from 23 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 15 government surveys (2010–2010) that recorded them.
Forage fish and other species (2)
Forage fish
- Trout-Perch 1
Other
- White Sucker 7
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Union Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Whitefish | 45-50 cm | 12 | 4 | Mercury |
| Northern Pike | 55-60 cm | 4 | Do not eat | Mercury |
| Walleye | 40-45 cm | 4 | Do not eat | Mercury |
| Burbot (Ling) | 45-50 cm | 16 | 4 | Mercury |
| White Sucker | 40-45 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 5. Check seasons and limits before you fish.
Getting on the water
1 listed boat launch. marks launches on the map.
- Boat launch