Blackstone Lake
45.2314° N, 79.8835° W
Depth contours from the 1969 government survey. Not for navigation.
Download the depth map (SVG)Blackstone Lake, Ontario. 45.2314° N, 79.8835° W
Maximum depth 57.9 m (1969 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/blackstone-lake-near-parry-sound/, 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.
- Fish stocking for recreational purposes, 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).
- Air Quality Health Index observations and forecasts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
Blackstone Lake is 57.9 m deep at its deepest point, deeper than 96% of the 2,688 surveyed lakes in Ontario. It covers 5.39 km² and lies 3.3 km south of Rosseau Road.
Government surveys have recorded 1 fish species here: lake trout.
- Maximum depth
- 57.9 msurveyed 1969
- deeper than 96% of the 2,688 surveyed lakes in Ontario
- Area
- 5.39 km²
- larger than 92% of the 18,731 lakes in Ontario
- Shoreline
- 34.2 km
- longer than 93% of the 18,731 lakes in Ontario
- Water clarity
- 3.8 mSecchi depth, 2025
- clearer than 57% of the 1,251 monitored lakes in Ontario
- Fish species
- 1
- fewer than 100% of the 2,454 surveyed lakes in Ontario
- Elevation
- 199 m
Today on the water
10.6 °C
Observed at Parry Sound, as of 2:00 a.m. EDT
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 | 3 a.m. | 6 a.m. | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 |
| Gusts | 50 | 50 | ||||||
| Waves (est.) m | 0.2 | 0.2 | 0.2 | 0.3 | ||||
| Temp. °C | 6 | 6 | 8 | 11 | 13 | 12 | 8 | 4 |
| Precip. % | 40 | 40 | 40 | 40 | 20 | 20 | 0 | 0 |
Tonight: Partly cloudy with 60 percent chance of showers. Risk of a thunderstorm early this evening. Wind west 30 km/h gusting to 50 becoming light this evening. Low plus 5.
Weather: Parry Sound (local forecast), as of 2:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:58 a.m.
- Sunrise
- 7:27 a.m.
- Sunset
- 6:44 p.m.
- Civil dusk
- 7:14 p.m.
- Moonrise
- 6:20 a.m.
- Moonset
- 6:03 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Parry Sound, as of 1:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Depth
25% of Blackstone 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 1969 records a maximum depth of 57.9 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
- Lake TroutStocked
Stocking
Lake Trout11,000 fish in 5 years, most recently 2025
All stocking records (5)
| Year | Species | Fish | Stage |
|---|---|---|---|
| 2025 | Lake Trout | 2,000 | Yearlings |
| 2023 | Lake Trout | 2,000 | Yearlings |
| 2021 | Lake Trout | 2,000 | Yearlings |
| 2019 | Lake Trout | 3,000 | Yearlings |
| 2017 | Lake Trout | 2,000 | Yearlings |
Fishing regulations: Fisheries Management Zone 15. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 21 years between 2000 and 2025; the latest annual mean is 3.8 m.
Getting on the water
1 listed access point; 1 with parking listed.
- Forget Lake
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.