Lake St. Francis (lac St-François)
Lake St. Francis (lac St-François) is the 19th-largest of 4,097 named lakes in Southern & Central Ontario, with 48 miles of charted shoreline and 31 islands. The lake lies 18 km northeast of Cornwall.
On this water
Lodges & operators 0
No operators recorded on this lake yet. Know one? It may be listed under a nearby community — browse the map.
2026 regulations
Seasons & limitsFMZ 20
- Special limit on this water — Yellow Perch: Jan. 1 - Mar. 31 & 2nd Sat. in May - Dec. 31 · Refer to zone-wide seasons and limits (Lancaster and Charlottenburgh Twps. (South Glengarry Twp.) and the City of Cornwall (all waters).)
Compiled from MNRF Recreational Fishing Regulations open data (2026 season, zone-wide rules shown for this lake's species). Regulations change by variation order — confirm with the official FMZ 20 summary before you fish.
Eating what you catch
Consumption advisories
Recommended meals per month from Ontario's fish contaminant monitoring — ranges span the tested fish sizes.
| Species | General | Sensitive* | Cause |
|---|---|---|---|
| Bluegill | 4 | 4 | PFAS |
| Brown Bullhead | 8 | 8 | PFAS |
| Channel Catfish | 1–4 | 0–4 | Mercury, PCB |
| Fallfish | 4–12 | 0–8 | Mercury, PCB, PFAS |
| Freshwater Drum | 1–2 | Do not eat | Mercury, PCB |
| Largemouth Bass | 4–8 | 0–8 | Mercury, PFAS |
| Northern Pike | 4–32 | 0–16 | Mercury, PCB, PFAS |
| Pumpkinseed | 4 | 4 | PFAS |
| Redhorse Sucker | 4–16 | 4–16 | Mercury, PCB |
| Rock Bass | 4 | 4 | Mercury, PFAS |
| Smallmouth Bass | 4 | 0–4 | Mercury, PFAS |
| Tench | 8 | Do not eat | Mercury, PFAS |
| Walleye | 0–4 | 0–4 | Mercury, PFAS |
| White Perch | 4–8 | 0–4 | Mercury |
| White Sucker | 4 | 0–4 | Mercury, PFAS |
| Yellow Perch | 4 | 0–4 | Mercury, PFAS |
*Women of child-bearing age and children under 15. Compiled from the MECP Guide to Eating Ontario Fish (2025 guide) — check the guide for size-specific advice before keeping fish.
Around this water