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107-acre lake in Carbon County, Montana. The lake tops out around 70 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Every species below gets its seasonal read from the same numbers driving the chart.
The chart traces 2.9 miles of shoreline here. The 2.7 development index tells the story — a convoluted bank whose fishable edge far outruns the acreage. Littoral water — the productive band under ~15 ft — makes up 54% of this chart. Figure 0.7 mi of water from one end to the other, 0.4 mi at the beam. You'll find it in Carbon County. For a second option, Lake Of The Winds lies 1 mi north.
In spring, brook trout run shallow here, mostly 2 to 15 ft. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 3 to 20 ft. Break off the point is the standout, a drop-off at roughly 12 ft, rated prime for summer brook trout. Time it for early morning and the evening. You won't need more than a small spoon fished deep or a trolled lake-clear wobbler + worm most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 15 ft | dawn & dusk | Main-lake point (5 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Break off the point (12 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (5 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (12 ft) | Small jigging spoon, Tungsten jig + plastic |
The chart marks 6 structure features on Mariane Lake; the deepest is Deep basin at about 66 ft.
Season dates, license requirements, and size and bag limits for Montana waters are set by the Montana Fish, Wildlife & Parks — and special regulations can apply to Mariane Lake specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Mariane Lake is about 70 ft (21 m) deep at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
Anglers target brook trout on Mariane Lake.
Break off the point is the top-rated area: a drop-off in about 12 ft of water that rates prime for brook 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 Mariane Lake is regulated by the Montana Fish, Wildlife & Parks. Check the official Montana regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Lake Of The Winds 1 mi · Rock Tree Lake 1 mi · Lake Of The Clouds 1 mi · Canyon Lake (Carbon) 1 mi · Russell Lake 2 mi · Bald Knob Lake 2 mi · Desolation Lake 2 mi · Diamond Lake (Carbon) 2 mi · Jordan Lake (Carbon) 2 mi · Anchor Lake 2 mi · Fossil Lake (Carbon) 3 mi · Aquarius Lake 3 mi
See how Mariane Lake stacks up: best brook trout lakes in Montana
More water nearby: Carbon County fishing maps (65 charts). Browse all Montana fishing maps or see every water on DepthScout. Bathymetry credit: state fisheries survey programs. 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.