Isaac Lake
44.7788° N, 81.2328° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)Isaac Lake, Ontario. 44.7788° N, 81.2328° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/isaac-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.
- Lake Partner Program, Ontario Ministry of the Environment, Conservation and Parks. 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.
Isaac Lake covers 3.25 km², making it larger than 87% of the 18,731 lakes in Ontario. It lies 3.3 km east of Red Bay.
Government surveys have recorded 19 fish species here, including pumpkinseed, northern pike and yellow perch.
- Area
- 3.25 km²
- larger than 87% of the 18,731 lakes in Ontario
- Shoreline
- 21.6 km
- longer than 89% of the 18,731 lakes in Ontario
- Water clarity
- 1.6 mSecchi depth, 1995
- less clear than 93% of the 1,251 monitored lakes in Ontario
- Fish species
- 19
- more than 97% of the 2,454 surveyed lakes in Ontario
- Elevation
- 183 m
Today on the water
9 °C
Observed at South Bruce Peninsula, as of 3:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.3 m. Around 9 a.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 | NW 20 | NW 20 | NW 30 | NW 30 | NW 30 | NE 10 | E 10 | SE 10 |
| Gusts km/h | 40 | 40 | 50 | 50 | 50 | |||
| Waves (est.) m | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | |||
| Temp. °C | 4 | 6 | 10 | 13 | 15 | 13 | 9 | 6 |
| Precip. % | 40 | 40 | 40 | 20 | 20 | 0 | 0 | 0 |
Tonight: Partly cloudy with 60 percent chance of showers. Wind northwest 30 km/h gusting to 50. Low plus 4.
Weather: South Bruce Peninsula (local forecast), as of 3:01 a.m. EDT
Sun and moon
- Civil dawn
- 7:03 a.m.
- Sunrise
- 7:32 a.m.
- Sunset
- 6:50 p.m.
- Civil dusk
- 7:19 p.m.
- Moonrise
- 6:25 a.m.
- Moonset
- 6:09 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Fish
Sport fish by the share of the 13 government surveys (1948–1995) that recorded them.
Forage fish and other species (12)
Forage fish
- Bluntnose Minnow 4
- Golden Shiner 4
- Johnny Darter 4
- Banded Killifish 3
- Central Mudminnow 3
- Iowa Darter 3
- Blackchin Shiner 1
- Tadpole Madtom 1
Other
- Bowfin 7
- Brown Bullhead 4
- White Sucker 3
- Common Carp 2
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 4 species from Isaac Lake. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Largemouth Bass | 35-40 cm | 8 | Do not eat | Mercury |
| Northern Pike | 55-60 cm | 12 | 4 | Mercury |
| Walleye | 45-50 cm | 4 | Do not eat | Mercury |
| Yellow Perch | 20-25 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 16. Check seasons and limits before you fish.
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.