Harp Lake
45.3786° N, 79.135° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)Harp Lake, Ontario. 45.3786° N, 79.135° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/harp-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).
- 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).
- Guide to Eating Ontario Fish: Advisory Database, Ontario Ministry of the Environment, Conservation and Parks. Contains information licensed under the Open Government Licence – Ontario.
Harp Lake covers 0.69 km², making it larger than 58% of the 18,731 lakes in Ontario. It lies 1.7 km northwest of Grassmere.
Government surveys have recorded 8 fish species here, including brook trout, yellow perch and burbot.
- Area
- 0.69 km²
- larger than 58% of the 18,731 lakes in Ontario
- Shoreline
- 4.7 km
- shorter than 54% of the 18,731 lakes in Ontario
- Water clarity
- 4.7 mSecchi depth, 2025
- clearer than 74% of the 1,251 monitored lakes in Ontario
- Fish species
- 8
- more than 65% of the 2,454 surveyed lakes in Ontario
- Elevation
- 329 m
Today on the water
8.2 °C
Observed at Huntsville, as of 3:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 12 p.m., wind from the northwest: the northwest shore is sheltered, waves build toward the southeast 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 15 | W 15 | NW 30 | NW 30 | NW 15 | var. 5 | var. 5 |
| Gusts km/h | 50 | 50 | ||||||
| Waves (est.) m | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | |||
| Temp. °C | 2 | 3 | 7 | 11 | 13 | 10 | 6 | 2 |
| 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 2.
Weather: Huntsville (local forecast), as of 3:02 a.m. EDT
Sun and moon
- Civil dawn
- 6:55 a.m.
- Sunrise
- 7:24 a.m.
- Sunset
- 6:41 p.m.
- Civil dusk
- 7:11 p.m.
- Moonrise
- 6:17 a.m.
- Moonset
- 6:00 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
2 low risk
Dorset, as of 3:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Fish
Sport fish by the share of the 4 government surveys (1996–2014) that recorded them.
Other species (1)
- White Sucker 1
Numbers are the surveys that recorded each species.
Stocking
Lake Trout2,500 fish in 5 years, most recently 2025
All stocking records (5)
| Year | Species | Fish | Stage |
|---|---|---|---|
| 2025 | Lake Trout | 500 | Yearlings |
| 2023 | Lake Trout | 500 | Yearlings |
| 2021 | Lake Trout | 500 | Yearlings |
| 2019 | Lake Trout | 500 | Yearlings |
| 2017 | Lake Trout | 500 | Yearlings |
Eating your catch
The provincial guide to eating fish (2026) sets limits for 5 species from Harp Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Lake Trout | 50-55 cm | 2 | Do not eat | Mercury |
| Smallmouth Bass | 35-40 cm | 4 | Do not eat | Mercury |
| Burbot (Ling) | 45-50 cm | 2 | Do not eat | Mercury |
| Cisco (Lake Herring) | 30-35 cm | 8 | Do not eat | Mercury |
| White Sucker | 40-45 cm | 16 | 8 | Mercury |
* 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 15. Check seasons and limits before you fish.
Water
Clarity was measured with a Secchi disk in 18 years between 1995 and 2025; the latest annual mean is 4.7 m.
Getting on the water
1 listed boat launch; 1 with parking listed. marks launches on the map.
- Boat launch
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.