Grindstone Lake
45.0139° N, 76.9531° W
Depth contours from the 1982 government survey. Not for navigation.
Download the depth map (SVG)Grindstone Lake, Ontario. 45.0139° N, 76.9531° W
Maximum depth 20 m (1982 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/grindstone-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.
- 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).
- Guide to Eating Ontario Fish: Advisory Database, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
Grindstone Lake is 20 m deep at its deepest point, deeper than 60% of the 2,688 surveyed lakes in Ontario. It covers 1.61 km² and lies 5 km north of Plevna.
Government surveys have recorded 9 fish species here, including smallmouth bass, lake whitefish and pumpkinseed.
- Maximum depth
- 20 msurveyed 1982
- deeper than 60% of the 2,688 surveyed lakes in Ontario
- Area
- 1.61 km²
- larger than 77% of the 18,731 lakes in Ontario
- Shoreline
- 14.3 km
- longer than 82% of the 18,731 lakes in Ontario
- Water clarity
- 6.1 mSecchi depth, 2023
- clearer than 91% of the 1,251 monitored lakes in Ontario
- Fish species
- 9
- more than 69% of the 2,454 surveyed lakes in Ontario
- Elevation
- 337 m
Today on the water
7.3 °C
Observed at Sharbot Lake, as of 5:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.3 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast shore.
| Time | 6 a.m. | 9 a.m. | 12 p.m. | 3 p.m. | 6 p.m. | 9 p.m. | 12 a.m. | 3 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 | var. 5 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.3 | 0.3 | 0.1 | |||
| Temp. °C | 4 | 7 | 11 | 13 | 12 | 6 | 2 | 1 |
| Precip. % | 40 | 40 | 40 | 40 | 20 | 20 | 0 | 0 |
Today: Mainly cloudy with 40 percent chance of showers. Wind becoming northwest 30 km/h gusting to 50 near noon. High 14. UV index 3 or moderate.
Weather: Sharbot Lake (local forecast), as of 5:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:46 a.m.
- Sunrise
- 7:15 a.m.
- Sunset
- 6:33 p.m.
- Civil dusk
- 7:02 p.m.
- Moonrise
- 6:07 a.m.
- Moonset
- 5:51 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Depth
31% of Grindstone Lake is deeper than 10 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 1982 records a maximum depth of 20 m, drawn from 55 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 7 government surveys (2010–2012) that recorded them.
Forage fish and other species (2)
Forage fish
- Bluntnose Minnow 1
Other
- White Sucker 5
Numbers are the surveys that recorded each species.
Stocking
Rainbow Trout83,920 fish in 10 years, most recently 2025
All stocking records (10)
| Year | Species | Fish | Stage |
|---|---|---|---|
| 2025 | Rainbow Trout | 8,000 | Yearlings |
| 2024 | Rainbow Trout | 9,500 | Yearlings |
| 2023 | Rainbow Trout | 6,920 | Yearlings |
| 2022 | Rainbow Trout | 8,000 | Yearlings |
| 2021 | Rainbow Trout | 8,000 | Yearlings |
| 2020 | Rainbow Trout | 8,000 | Yearlings |
| 2019 | Rainbow Trout | 8,000 | Yearlings |
| 2018 | Rainbow Trout | 9,400 | Yearlings |
| 2017 | Rainbow Trout | 10,100 | Yearlings |
| 2016 | Rainbow Trout | 8,000 | Yearlings |
Eating your catch
The provincial guide to eating fish (2026) sets limits for 3 species from Grindstone Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Whitefish | 45-50 cm | 12 | 4 | Mercury, PCB |
| Smallmouth Bass | 35-40 cm | 8 | Do not eat | Mercury |
| Splake | 50-55 cm | 12 | 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 18. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 10 years between 1997 and 2023; the latest annual mean is 6.1 m.
Getting on the water
2 listed boat launches; 1 with parking listed. marks launches on the map.
- Boat launch
- Boat launch
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.