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Rating depth structure for rainbow trout.
Shared by DepthScout anglers. Exact spots stay private, always.
92-acre lake near Marlboro. The lake tops out around 20 ft. The depth chart comes from published agency bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The season-by-season read for each species follows, from the map's own numbers.
The drawn water covers 91 acres wrapped in 1.5 miles of bank. Nearly circular (index 1.1), so the story is the bottom, not the bank. The shallow band under 15 ft claims about 95% of the surface — that's where the groceries are. Figure 0.6 mi of water from one end to the other, 0.3 mi at the beam. Division No. 14 claims this one. Its nearest charted neighbour, Black Mud Lake, is 2 mi to the west.
Spring arctic grayling on Millers Lake hold shallow, usually 2 to 10 ft. They move out to 3 to 15 ft in summer and finish the year down in 6 to 20 ft. Put Deep basin first on the milk run — a deep basin near 20 ft that grades prime for winter. The feeding windows run the evening and early morning. The summer box starts with a dry fly (parachute adams, elk hair caddis) or a small inline spinner.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 10 ft | midday & dusk | Shallow bay flat (3 ft) | 1/16 oz spinner (silver), Small dry fly (Adams, Griffith's) |
| Summer | 3 to 15 ft | dusk & dawn | Break off the point (11 ft) | Dry fly (parachute Adams, elk hair caddis), Small inline spinner |
| Fall | 6 to 20 ft | midday | Break off the point (11 ft) | Small spoon, Beadhead nymph under indicator |
| Winter | 6 to 20 ft | midday & dawn | Deep basin (20 ft) | Tungsten jig + waxworm, Small jigging spoon (gold) |
Spring brook trout on Millers Lake hold shallow, usually 2 to 15 ft. They move out to 6 to 20 ft in summer and finish the year down in 3 to 20 ft. Put Deep basin first on the milk run — a deep basin near 20 ft that grades prime for summer. The feeding windows run 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 | Main-lake point (8 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 6 to 20 ft | dawn & dusk | Deep basin (20 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (8 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Deep basin (20 ft) | Small jigging spoon, Tungsten jig + plastic |
Spring puts brown trout in skinny water — 2 to 20 ft is the zone. Summer fish stay in 6 to 20 ft, and winter fish hold in 3 to 20 ft. Summer brown trout concentrate at Break off the point, a prime-rated drop-off around 11 ft. Warm-month bites cluster around after dark and early morning. A spoon at the thermocline or a deep stickbait (night) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 20 ft | dawn & dusk | Main-lake point (8 ft) | Stickbait off planer boards (shallow), Small spoon along mud lines |
| Summer | 6 to 20 ft | night & dawn | Break off the point (11 ft) | Spoon at the thermocline, Deep stickbait (night) |
| Fall | 3 to 20 ft | dusk & dawn | Main-lake point (8 ft) | Jerkbait over gravel, Casting spoon |
| Winter | 3 to 20 ft | dawn | Break off the point (11 ft) | Jigging spoon, Small stickbait (slow) |
Early season rainbow trout use the shallows, holding in 5 to 20 ft. Even in summer they hold at 5 to 20 ft; winter keeps them in 4 to 20 ft. The chart's best answer is Break off the point — drop-off, 11 ft, prime for winter. Best bite is 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 | Main-lake point (8 ft) | Inline spinner (silver), Small spoon |
| Summer | 5 to 20 ft | dawn & dusk | Break off the point (11 ft) | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 6 to 20 ft | dawn & dusk | Main-lake point (8 ft) | Casting spoon, Jerkbait over shoals |
| Winter | 4 to 20 ft | dawn | Break off the point (11 ft) | Jigging spoon, Tube jig (white) |
The chart marks 6 structure features on Millers Lake; the deepest is Deep basin at about 20 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 Millers Lake specifically, so confirm the current rules before you fish.
Check the official Alberta fishing regulations →
Millers Lake is about 20 ft (6 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 arctic grayling, brook trout, brown trout, rainbow trout on Millers Lake.
Deep basin is the top-rated area: a deep basin in about 20 ft of water that rates prime for arctic grayling in winter. The map above holds the full rated-spot list for every species and season.
For arctic grayling, the summer bite is best in the evening and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Millers 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.
Black Mud Lake 2 mi · Fickle Lake 8 mi · Obed Lake 15 mi · Sang Lake 25 mi · Shiningbank Lake 36 mi · Mary Gregg Lake 42 mi · Gregg Lake 42 mi · Graveyard/Cache Lakes 43 mi · Jarvis Lake 43 mi · Kinky Lake 46 mi · Wildhorse Lakes 47 mi · Smoke Lake 56 mi
See how Millers Lake stacks up: best rainbow trout lakes in Alberta · best brown trout lakes in Alberta · best brook trout lakes in Alberta · best arctic grayling 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.