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Fishing O'Brien Lake: what the data says
11-acre lake near Ontario. The lake tops out around 37 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Brook Trout fishing at O'Brien Lake
Start shallow in spring: brook trout sit in 2 to 15 ft that time of year. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. Shoreline break is the standout, a drop-off at roughly 17 ft, rated prime for summer brook trout. In summer the feeding windows fall in early morning and the evening. Summer baits: a small spoon fished deep or a trolled lake-clear wobbler + worm gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Small jigging spoon, Tungsten jig + plastic |
Rainbow Trout fishing at O'Brien Lake
Spring rainbow trout on O'Brien Lake hold shallow, usually 5 to 20 ft. They move out to 8 to 30 ft in summer and finish the year down in 7 to 37 ft. If you only fish one area, make it Shoreline break: a drop-off around 17 ft that scores prime in winter. Best bite is early morning and the evening. Summer baits: a dodger + spoon (deep troll) or a flutter spoon gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 7 to 37 ft | dawn | Jigging spoon, Tube jig (white) |
Notable structure
- Deep basin: deep basin, around 31 ft
- Shoreline break: drop-off, around 17 ft
- Shallow bay flat: weed flat, around 4 ft
Common questions
How deep is O'Brien Lake?
O'Brien Lake is about 37 ft at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
What fish are in O'Brien Lake?
Anglers target rainbow trout, brook trout on O'Brien Lake.
Where is the best fishing spot on O'Brien Lake?
Shoreline break is the top-rated area: a drop-off in about 17 ft of water that rates prime for rainbow trout in winter. Open the map above to see every rated spot for each species and season.
When is the best time to fish O'Brien Lake?
For brook trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Nearby waters
Donahue Long Lake · Little Garvin Lake · Garvin Lake · Archies Lake · Hardwood Lake · Crutch Lake
See how O'Brien Lake stacks up: best rainbow trout lakes in Ontario · best brook trout lakes in Ontario
Browse all Ontario fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.