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Rating depth structure for rainbow trout.
Shared by DepthScout anglers. Exact spots stay private, always.
27-acre lake near Cadomin. The lake tops out around 54 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. Below is the species-by-species picture, pulled from the same data the map uses.
The drawn water covers 27 acres wrapped in 1.5 miles of bank. With a 2 development index there's bank structure worth casting at, in moderation. About 32% of the surface sits shallower than 15 ft — that's the weed-and-bait zone. End to end it runs roughly 0.7 mi. It sits in Division No. 14. Wildhorse Lakes sits 18 mi northwest — the closest neighbouring chart.
Spring brook trout on Mary Gregg Lake hold shallow, usually 2 to 15 ft. By summer they slide out to 10 to 30 ft, and by winter most fish are in 3 to 20 ft. The chart's best answer is Break off the point — drop-off, 23 ft, prime for summer. Prime time lands in early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Secondary point (7 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (23 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Secondary point (7 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Shallow bay flat (10 ft) | Small jigging spoon, Tungsten jig + plastic |
Spring puts brown trout in skinny water — 3 to 25 ft is the zone. Warm water sends them out to 16 to 54 ft; cold water stacks them in 5 to 35 ft. Break off the point is the standout, a drop-off at roughly 23 ft, rated prime for summer brown trout. Plan around after dark and early morning in the warm months. A spoon at the thermocline or a deep stickbait (night) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 25 ft | dawn & dusk | Main-lake point (22 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 16 to 54 ft | night & dawn | Break off the point (23 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 5 to 30 ft | dusk & dawn | Main-lake point (22 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 5 to 35 ft | dawn | Break off the point (23 ft) | Jigging spoon, Small stickbait (slow) |
Early season rainbow trout use the shallows, holding in 5 to 20 ft. Expect a summer slide to 8 to 30 ft, then a winter hold in 8 to 40 ft. Put Break off the point first on the milk run — a drop-off near 23 ft that grades prime for winter. In summer the feeding windows fall in early morning and the evening. Tie on a dodger + spoon (deep troll) or a flutter spoon and you're in the game.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Secondary point (7 ft) | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Break off the point (23 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Main-lake point (22 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Break off the point (23 ft) | Jigging spoon, Tube jig (white) |
The chart marks 5 structure features on Mary Gregg Lake; the deepest is Deep basin at about 53 ft.
Season dates, license requirements, and size and bag limits for Alberta waters are set by the Alberta fishing regulations — and special regulations can apply to Mary Gregg Lake specifically, so confirm the current rules before you fish.
Check the official Alberta fishing regulations →
Mary Gregg Lake is about 54 ft (16 m) deep at its deepest point. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled.
Anglers target brook trout, brown trout, rainbow trout on Mary Gregg Lake.
Break off the point is the top-rated area: a drop-off in about 23 ft of water that rates prime for brown trout in summer. Every other rated spot, per species and season, is on the map above.
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.
Fishing on Mary Gregg Lake is regulated by the Alberta fishing regulations. Check the official Alberta regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Wildhorse Lakes 18 mi · Kinky Lake 18 mi · Jarvis Lake 28 mi · Graveyard/Cache Lakes 30 mi · Gregg Lake 33 mi · Obed Lake 34 mi · Fickle Lake 36 mi · Black Mud Lake 41 mi · Rock Lake 41 mi · Millers Lake 42 mi · Portal Lake 44 mi, BC/AB · Yellowhead Lake 49 mi, BC
See how Mary Gregg Lake stacks up: best rainbow trout lakes in Alberta · best brown trout lakes in Alberta · best brook trout lakes in Alberta
More water nearby: Division No. 14 fishing maps (13 charts). Browse all Alberta fishing maps or 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.