Lake St. Joseph
51.0537° N, 90.8271° W
Depth contours from the 1973 government survey. Not for navigation.
Download the depth map (SVG)Lake St. Joseph, Ontario. 51.0537° N, 90.8271° W
Maximum depth 24.4 m (1973 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/lake-st-joseph/, 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.
- Real-time hydrometric data, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- National Water Data Archive (HYDAT) daily means, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
- 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.
Lake St. Joseph is 24.4 m deep at its deepest point, deeper than 70% of the 2,688 surveyed lakes in Ontario. It covers 506 km² and lies beside Rat Rapids.
Government surveys have recorded 2 fish species here: northern pike and walleye.
- Maximum depth
- 24.4 msurveyed 1973
- deeper than 70% of the 2,688 surveyed lakes in Ontario
- Area
- 506 km²
- larger than 99% of the 18,731 lakes in Ontario
- Shoreline
- 1,530 km
- longer than 99% of the 18,731 lakes in Ontario
- Fish species
- 2
- fewer than 60% of the 2,454 surveyed lakes in Ontario
- Elevation
- 371 m
Today on the water
2.6 °C
Observed at Pickle Lake, as of 1:00 a.m. CDT
choppy Estimated waves, next 12 hours: up to 0.3 m. Wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 2 a.m. | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | SW 10 | SW 10 | S 20 | S 15 | S 15 | SE 15 | SE 30 |
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.3 | ||||
| Temp. °C | 2 | 1 | 1 | 6 | 10 | 10 | 7 | 5 |
| Precip. % | 20 | 20 | 20 | 30 | 30 | 30 | 80 | 80 |
Tonight: Cloudy with 60 percent chance of showers this evening. Clearing before morning. Fog patches developing overnight. Wind northwest 20 km/h gusting to 40 becoming light this evening. Low zero.
Weather: Pickle Lake (local forecast), as of 1:02 a.m. CDT
Sun and moon
- Civil dawn
- 6:43 a.m.
- Sunrise
- 7:17 a.m.
- Sunset
- 6:23 p.m.
- Civil dusk
- 6:56 p.m.
- Moonrise
- 6:09 a.m.
- Moonset
- 5:41 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
The government depth survey from 1973 records a maximum depth of 24.4 m, drawn from 460 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 4 government surveys (2019–2022) that recorded them.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Lake St. Joseph. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Whitefish | 45-50 cm | 16 | 16 | Precautionary |
| Northern Pike | 55-60 cm | 8 | 4 | Mercury |
| Walleye | 40-45 cm | 16 | 4 | Mercury |
| Cisco (Lake Herring) | 30-35 cm | 16 | 12 | Precautionary |
| White Sucker | 40-45 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 2. Check seasons and limits before you fish.
Getting on the water
1 listed boat launch; 1 with parking listed. marks launches on the map.
- Lake St Joseph Boat Launch
Follow this lake
Every Friday by email: the Environment Canada forecast, the water level at the nearest gauge and any weather alerts in effect.