Map/Lakes/Southern & Central Ontario
Third Depot Lake
One lake, 2 charted basins — combined figures below.
Surface area
425 ac172 ha
Max depth
48 ft14.6 m
Mean depth
16 ft4.8 m
Water type
Warm-water
Mgmt zone
FMZ 18
Shoreline
15 mi24 km
Boat launch
On the lakeLIO access points
Nearest road
Roadside4TH LAKE ROAD
Depth map
Available
Third Depot Lake is the 369th-largest of 4,097 named lakes in Southern & Central Ontario, with 15 miles of charted shoreline and 20 islands. Its 48 ft maximum depth is greater than 64% of depth-surveyed lakes in the region.
Fish species
From MNRF aquatic resource surveys.
Also present: Bluegill, Brown Bullhead, Burbot, Common Shiner, Northern Pearl Dace, Pumpkinseed, Rock Bass
Lodges & operators0
No operators recorded on this lake yet. Know one? It may be listed under a nearby community — browse the map.
Seasons & limitsFMZ 18
| Species | Season | Sport licence | Conservation |
|---|---|---|---|
| Northern Pike | Jan. 1 - Mar. 31 & 2nd Sat. in May - Dec. 31 | S - 6 | C - 2 |
| Walleye and Sauger or any combination | Jan. 1 - Mar. 1 & 2nd Sat. in May - Dec. 31 | S - 4, must be between 40 - 50 cm (15.7 – 19.7 in.) | C - 2, must be between 40 - 50 cm (15.7 – 19.7 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 18 summary before you fish.
Consumption advisories
Recommended meals per month from Ontario's fish contaminant monitoring — ranges span the tested fish sizes.
| Species | General | Sensitive* | Cause |
|---|---|---|---|
| Largemouth Bass | 16 | 4 | Mercury |
| Northern Pike | 4 | Do not eat | Mercury |
| Walleye | 0–12 | 0–4 | Mercury |
*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.
Similar water
Same region, overlapping species, comparable size.
- Balsam Lake11 shared species · 11,774 ac
- Depot Creek11 shared species · 11 ac
- Lac Deschênes11 shared species · 23,549 ac
- Lac Dollard-des-Ormeaux11 shared species · 39,817 ac
- Lake Erie (lac Érié)11 shared species · 6,296,600 ac
Nearby lakes
- Depot Creek0.7 mi · species data
- Fourth Depot Lake1.7 mi · species data
- Second Depot Lake1.5 mi · species data
- First Depot Lake4.8 mi · species data
- Elbow Lake5.3 mi · species data
- Fifth Depot Lake4.7 mi