Map/Lakes/Southern & Central Ontario
Lake St. Lawrence
One lake, 2 charted basins — combined figures below.
Surface area
14,201 ac5,747 ha
Mgmt zone
FMZ 20
Shoreline
125 mi201 km
Boat launch
3 mappedLIO access points
Nearest road
RoadsideLONG SAULT PARKWAY
Depth map
None on file
Lake St. Lawrence is the 17th-largest of 4,097 named lakes in Southern & Central Ontario, with 125 miles of charted shoreline and 54 islands.
Fish species
From MNRF aquatic resource surveys.
Also present: Alewife, American Eel, Banded Killifish, Bluegill, Bluntnose Minnow, Brook Stickleback, Brown Bullhead, Brown Trout, Central Mudminnow, Common Carp, Common Shiner, Creek Chub, Cutlip Minnow, Emerald Shiner, Fallfish, Gizzard Shad, Golden Shiner, Johnny Darter x Tesselated Darter, Lake Chub, Logperch, Longnose Gar, Mooneye, Mottled Sculpin, Pumpkinseed, Rainbow Smelt, River Redhorse, Rock Bass, Sauger, Shorthead Redhorse, Silver Redhorse, Spottail Shiner, Stonecat, Threespine Stickleback, Trout-Perch, White Perch, White Sucker
Lodges & operators0
No operators recorded on this lake yet. Know one? It may be listed under a nearby community — browse the map.
Seasons & limitsFMZ 20
Lake-specific regulations
- Fish sanctuary: Fish sanctuary - no fishing from Mar. 1 - Fri. before 2nd Sat. in May (Hoople Creek - Osnabruck Twp.)
| Species | Season | Sport licence | Conservation |
|---|---|---|---|
| Brown Trout | Open all year | S - 5 | C - 2 |
| Lake Whitefish | Open all year | S - 12 | C - 6 |
| Largemouth Bass | January 1 to May 10 | S - 0 | C - 0 |
| Largemouth Bass | Third Saturday in June to December 31 | S - 6 | C - 2 |
| Muskellunge | 3rd Sat. in June - Dec. 15 | S - 1, must be greater than 137 cm (54 in.) | C - 0 |
| Northern Pike | Jan. 1 - Mar. 31 & 1st Sat. in May - Dec. 31 | S - 6 | C - 2 |
| Smallmouth Bass | First Saturday in July to December 31 | S - 6 | C - 2 |
| Smallmouth Bass | January 1 to May 10 | S - 0 | C - 0 |
| Walleye and Sauger or any combination | Jan. 1 - Mar.1 & the 1st Sat. in May - Dec. 31 | S - 4, not more than 1 greater than 63 cm (24.8 in.) | C - 2, not more than 1 greater than 63 cm (24.8 in.) |
| Yellow Perch | Open all year | S - 50 | C - 25 |
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.
Similar water
Same region, overlapping species, comparable size.
- Lac Dollard-des-Ormeaux38 shared species · 39,817 ac
- Lake Erie (lac Érié)38 shared species · 6,296,600 ac
- Lac Deschênes35 shared species · 23,549 ac
- Lake Ontario (lac Ontario)35 shared species · 2,461,151 ac
- Lower Allumette Lake33 shared species · 9,603 ac
Nearby lakes
- Loch Garry18.9 mi · species data
- Lake St. Francis (lac St-François)22.2 mi
- Lac Georges41.8 mi · species data
- Lac Dollard-des-Ormeaux43.4 mi · species data
- Dow's Lake48.6 mi · species data
- Cranberry Lake48.7 mi · species data