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16-acre lake in Carbon County, Montana. The lake tops out around 35 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. Here is how the season plays out for each species, straight from the data behind the map.
The drawn water covers 18 acres wrapped in 1 miles of bank. With a 1.7 development index there's bank structure worth casting at, in moderation. Roughly 59% of the water is 15 ft or less, the band where the food chain lives. Figure 0.4 mi of water from one end to the other. Carbon County claims this one. If the bite dies, Mule Lake is 1 mi to the southeast.
Spring brook trout on Thiel Lake hold shallow, usually 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. Put Break off the point first on the milk run — a drop-off near 5 ft that grades prime for winter. 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 (1 ft) | Small inline spinner (gold), Tiny spoon |
| Summer | 10 to 30 ft | dawn & dusk | Deep basin (35 ft) | Small spoon fished deep, Trolled lake-clear wobbler + worm |
| Fall | 2 to 15 ft | midday & dawn | Main-lake point (1 ft) | Small spoon (orange), Spinner |
| Winter | 3 to 20 ft | dawn | Break off the point (5 ft) | Small jigging spoon, Tungsten jig + plastic |
Thiel Lake carries 4 mapped structure features, topping out (or rather bottoming out) at Deep basin, about 35 ft down.
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 Thiel Lake specifically, so confirm the current rules before you fish.
Check the official Montana fishing regulations →
Thiel Lake is about 35 ft (11 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 Thiel Lake.
Break off the point is the top-rated area: a drop-off in about 5 ft of water that rates prime for brook trout in winter. Open the map above to see every rated spot for each species and season.
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 Thiel 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.
Mule Lake 1 mi, WY · Burnt Bacon Lake 1 mi · North Hidden Lake 1 mi · Surprise Lake 1 mi, WY · Elk Lake 1 mi, WY · Box Lake 1 mi, WY · Granite Lake 1 mi, WY · Estelle Lake (Carbon) 2 mi · Native Lake 2 mi, WY · Cloverleaf Lake #215 2 mi · Green Lake (Carbon) 2 mi · T Lake 2 mi, WY
See how Thiel 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.