Lake St. Francis
45.1393° N, 74.4331° W
Shoreline and neighbouring water from open government data.
Download the map (SVG)Lake St. Francis, Ontario. 45.1393° N, 74.4331° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/on/lake-st-francis/, 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.
- 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.
- Photographs, Wikimedia Commons contributors. Each photo carries its own licence (CC0, public domain, CC BY or CC BY-SA), credited where shown.
Lake St. Francis covers 238 km², making it larger than 99% of the 18,731 lakes in Ontario. It lies 1.8 km northeast of Cornwall.
Government surveys have recorded 43 fish species here, including yellow perch, largemouth bass and pumpkinseed.
- Area
- 238 km²
- larger than 99% of the 18,731 lakes in Ontario
- Shoreline
- 315 km
- longer than 99% of the 18,731 lakes in Ontario
- Fish species
- 43
- more than 99% of the 2,454 surveyed lakes in Ontario
- Elevation
- 43 m
Today on the water
8.6 °C
Observed at Saint-Timothée, as of 5:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.4 m. Around 9 a.m., wind from the west: the west shore is sheltered, waves build toward the east 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 20 | W 20 | W 20 | W 20 | W 10 | W 10 | W 10 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 | |||
| Temp. °C | 9 | 11 | 12 | 13 | 11 | 8 | 5 | 4 |
| Precip. % | 0 | 0 | 40 | 40 | 40 | 0 | 0 | 0 |
Today: A mix of sun and cloud. 40 percent chance of showers this afternoon with risk of a thunderstorm. Wind becoming west 20 km/h gusting to 40 this morning. High 14. UV index 3 or moderate.
Weather: Saint-Timothée (local forecast), as of 5:00 a.m. EDT
Sun and moon
- Civil dawn
- 6:36 a.m.
- Sunrise
- 7:05 a.m.
- Sunset
- 6:23 p.m.
- Civil dusk
- 6:52 p.m.
- Moonrise
- 5:57 a.m.
- Moonset
- 5:41 p.m.
- Moon
- Waning crescent, 1% lit
Air Quality Health Index
1 low risk
Cornwall, as of 4:00 a.m. EDT
Follow this lake by email: a weekly summary of conditions.
Fish
Sport fish by the share of the 75 government surveys (1990–2015) that recorded them.
Forage fish and other species (34)
Forage fish
- Golden Shiner 36
- Brook Silverside 31
- Banded Killifish 26
- Bluntnose Minnow 24
- Logperch 11
- Spottail Shiner 7
- Mimic Shiner 6
- Blackchin Shiner 5
- Brassy Minnow 5
- Alewife 4
- Blacknose Shiner 4
- Brook Stickleback 4
- Johnny Darter 4
- Central Mudminnow 3
- Fallfish 3
- Tadpole Madtom 3
- Creek Chub 1
- Cutlip Minnow 1
- Emerald Shiner 1
- Fathead Minnow 1
- Gizzard Shad 1
- Northern Redbelly Dace 1
- Sand Shiner 1
Other
- Round Goby 43
- Brown Bullhead 29
- White Sucker 23
- Freshwater Tubenose Goby 5
- Common Carp 4
- Longnose Gar 3
- American Eel 2
- Bowfin 2
- Longnose Sucker 1
- Silver Redhorse 1
- White Perch 1
Numbers are the surveys that recorded each species.
Eating your catch
The provincial guide to eating fish (2026) sets limits for 16 species from Lake St. Francis. Maximum meals per month:
| Species | Length | General population | Sensitive population* | Contaminant |
|---|---|---|---|---|
| Bluegill | 15-20 cm | 4 | 4 | PFAS |
| Channel Catfish | 45-50 cm | 1 | Do not eat | PCB |
| Freshwater Drum | 55-60 cm | 2 | Do not eat | PFAS |
| Largemouth Bass | 30-35 cm | 2 | Do not eat | PFAS |
| Northern Pike | 55-60 cm | 4 | 4 | PFAS |
| Pumpkinseed | 15-20 cm | 4 | 4 | PFAS |
| Rock Bass | 15-20 cm | 2 | Do not eat | PFAS |
| Smallmouth Bass | 35-40 cm | 2 | Do not eat | PFAS |
| Walleye | 40-45 cm | 1 | Do not eat | PFAS |
| Yellow Perch | 20-25 cm | 4 | 4 | PFAS |
| Brown Bullhead | 25-30 cm | 8 | 8 | PFAS |
| Fallfish | 30-35 cm | 2 | Do not eat | PFAS |
| Redhorse Sucker | 45-50 cm | 2 | Do not eat | PFAS |
| Tench | 45-50 cm | 12 | 8 | PFAS |
| White Perch | 15-20 cm | 2 | Do not eat | PFAS |
| White Sucker | 40-45 cm | 4 | 4 | PFAS |
* 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
Getting on the water
1 listed boat launch; 1 with parking listed. marks launches on the map.
- Boat launch
Photos
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Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.