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Rating depth structure for rainbow trout.
Recent public catches load as you reach this section.
123-acre lake in Frontenac County, Ontario. The lake tops out around 160 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from a transect sounding survey by the Ontario MNRF. Here is how the season plays out for each species, straight from the data behind the map.
Traced from the shoreline, Mair Lake runs 123 acres with 3.3 miles of edge. Index 2.1 on the shoreline: a few honest points and pockets, nothing labyrinthine. About 19% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. Call it 0.8 mi long by 0.6 mi wide at the broadest reach. You'll find it in Frontenac County. Closest neighbour on DepthScout: Redhorse Lake, 2 mi southeast of here.
Start shallow in spring: rainbow trout sit in 5 to 20 ft that time of year. Summer pushes them deeper, 8 to 30 ft, and winter fish settle into 8 to 40 ft. The spot to know is Secondary point, a point in about 21 ft of water that rates prime for rainbow trout in fall. Warm-month bites cluster around early morning and the evening. Throw a dodger + spoon (deep troll) or a flutter spoon until the fish tell you otherwise.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Secondary point (21 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Secondary point (21 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Secondary point (21 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | open water | Jigging spoon, Tube jig (white) |
Mair Lake carries 6 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 160 ft down.
Access data: Geospatial Ontario - Fishing Access Points; Government of Ontario - MNR Unpatented Crown Land Shoreline; Government of Ontario - MNR Unpatented Crown Land Shoreline. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Ontario waters are set by the Ontario fishing regulations (FMZ summary) — and special regulations can apply to Mair Lake specifically, so confirm the current rules before you fish.
Check the official Ontario fishing regulations →
Mair Lake is about 160 ft (49 m) deep at its deepest point. The depth data here comes from a transect sounding survey by the Ontario MNRF.
Anglers target rainbow trout on Mair Lake.
Secondary point is the top-rated area: a point in about 21 ft of water that rates prime for rainbow trout in fall. The interactive chart above rates every spot for each species and season.
For rainbow 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.
Fishing on Mair Lake is regulated by the Ontario fishing regulations (FMZ summary). Check the official Ontario regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Redhorse Lake 2 mi · Govan Lake 2 mi · Wolfe Lake 3 mi · Granite Lake 3 mi · Perch Lake 4 mi · Canonto Lake 4 mi · McCreary Lake 4 mi · Summit Lake 5 mi · Crib Lake 5 mi · Lavant Long Lake 5 mi · Mousseau Lake 5 mi · Big Mair Lake 6 mi
See how Mair Lake stacks up: best rainbow trout lakes in Ontario
More water nearby: Frontenac County fishing maps (127 charts). Browse all Ontario fishing maps. See every water on DepthScout. Bathymetry: published agency survey data. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.