Lakes / Montana / Fish Species / Brown Trout

Montana Lakes With Brown Trout

54 counted Montana lakes list Brown Trout in Montana Fish, Wildlife & Parks records. The largest is Fort Peck Lake at 233,053 acres.

#	Lake	County	Surface Area	Max Depth
1	Fort Peck Lake	Valley	233,053 acres	-
2	Canyon Ferry Lake	Broadwater	32,773 acres	About 170 ft
3	Hebgen Lake	Gallatin	12,564 acres	About 80 ft
4	Bighorn Lake	Big Horn	12,422.5 acres	About 440 ft
5	Noxon Reservoir	Sanders	7,592 acres	-
6	Clark Canyon Reservoir	Beaverhead	4,815 acres	About 91 ft
7	Ennis Lake	Madison	3,692 acres	-
8	Holter Lake	Lewis and Clark	3,667 acres	-
9	Bynum Reservoir	Teton	3,205 acres	-
10	Hauser Lake	Lewis and Clark	3,200 acres	About 65 ft
11	Fresno Reservoir	Hill	3,185 acres	-
12	Cabinet Gorge Reservoir	Sanders	2,848 acres	-
13	Tongue River Reservoir	Big Horn	2,112 acres	-
14	Lake Helena	Lewis and Clark	2,073 acres	About 12 ft
15	Deadmans Basin Reservoir	Wheatland	1,954 acres	-
16	Duck Lake	Glacier	1,446 acres	-
17	Placid Lake	Missoula	1,212 acres	About 93 ft
18	Seeley Lake	Missoula	1,031 acres	About 120 ft
19	Thompson Falls Reservoir	Sanders	969 acres	-
20	Martinsdale Reservoir	Meagher	947 acres	-
21	Ruby River Reservoir	Madison	941 acres	-
22	Mission Lake	Glacier	755 acres	-
23	Cooney Reservoir	Carbon	733 acres	-
24	Four Horns Lake	Glacier	719 acres	-
25	Willow Creek Reservoir	Madison	713 acres	-
26	Upper Holter Lake	Lewis and Clark	695 acres	-
27	Salmon Lake	Missoula	631 acres	About 65 ft
28	Earthquake Lake	Madison	612 acres	About 120 ft
29	Middle Thompson Lake	Lincoln	557 acres	About 160 ft
30	Lodge Grass Storage Reservoir	Big Horn	534 acres	-
31	Nilan Reservoir	Lewis and Clark	521 acres	-
32	Petrolia Lake	Petroleum	518 acres	-
33	Eureka Reservoir	Teton	366 acres	-
34	Upper Glaston Lake	Sweet Grass	334 acres	-
35	Lebo Lake	Wheatland	309 acres	-
36	Lake Inez	Missoula	288 acres	About 72 ft
37	Ackley Lake	Judith Basin	226 acres	About 39 ft
38	Bair Reservoir	Meagher	221 acres	-
39	Lower Thompson Lake	Lincoln	202 acres	About 140 ft
40	Wade Lake	Madison	202 acres	-
41	Rock Creek Lake	Powell	178 acres	-
42	Hidden Lake	Madison	147 acres	About 72 ft
43	East Rosebud Lake	Carbon	139 acres	About 20 ft
44	East Fork Reservoir	Fergus	90 acres	-
45	Boneau Reservoir	Chouteau	63 acres	-
46	Lake Elmo	Yellowstone	62 acres	About 16 ft
47	Emerald Lake	Stillwater	34 acres	-
48	Desolation Lake	Carbon	34 acres	About 70 ft
49	West Rosebud Lake	Stillwater	20 acres	-
50	Northern Pacific Reservoir	Jefferson	16 acres	-
51	Twin Lakes	Teton	7 acres	-
52	North One Horse Lake	Missoula	6 acres	-
53	Island Lake	Stillwater	4 acres	-
54	Powell Lake	Powell	3 acres	-

Source: Montana Fish, Wildlife & Parks lake data. Verified October 30, 2026.