Lakes / Montana / Fish Species / Brook Trout

Montana Lakes With Brook Trout

282 counted Montana lakes list Brook Trout in Montana Fish, Wildlife & Parks records. The largest is Flathead Lake at 122,132 acres.

#	Lake	County	Surface Area	Max Depth
1	Flathead Lake	Lake	122,132 acres	About 380 ft
2	Canyon Ferry Lake	Broadwater	32,773 acres	About 170 ft
3	Lake Koocanusa	Lincoln	28,723 acres	-
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	Saint Mary Lake	Glacier	3,933 acres	-
8	Ennis Lake	Madison	3,692 acres	-
9	Holter Lake	Lewis and Clark	3,667 acres	-
10	Whitefish Lake	Flathead	3,315 acres	About 220 ft
11	Swan Lake	Lake	3,269 acres	About 120 ft
12	Bynum Reservoir	Teton	3,205 acres	-
13	Hauser Lake	Lewis and Clark	3,200 acres	About 65 ft
14	Upper Red Rock Lake	Beaverhead	2,948 acres	About 5 ft
15	Cabinet Gorge Reservoir	Sanders	2,848 acres	-
16	Georgetown Lake	Granite	2,818 acres	About 25 ft
17	Lower Saint Mary Lake	Glacier	2,177 acres	-
18	Lake Helena	Lewis and Clark	2,073 acres	About 12 ft
19	Deadmans Basin Reservoir	Wheatland	1,954 acres	-
20	McGregor Lake	Flathead	1,522 acres	About 220 ft
21	Pishkun Reservoir	Teton	1,518 acres	About 78 ft
22	Lake Sherburne	Glacier	1,368 acres	About 60 ft
23	Willow Creek Reservoir	Lewis and Clark	1,314 acres	About 50 ft
24	Gibson Reservoir	Lewis and Clark	1,289 acres	About 165 ft
25	Tally Lake	Flathead	1,211 acres	About 450 ft
26	Bull Lake	Lincoln	1,162 acres	About 60 ft
27	Upper Waterton Lake	Glacier	1,009 acres	-
28	Ruby River Reservoir	Madison	941 acres	-
29	Lindbergh Lake	Missoula	815 acres	About 120 ft
30	Echo Lake	Flathead	695 acres	About 70 ft
31	Upper Holter Lake	Lewis and Clark	695 acres	-
32	Upper Stillwater Lake	Flathead	592 acres	-
33	Dickey Lake	Lincoln	585 acres	About 70 ft
34	Middle Thompson Lake	Lincoln	557 acres	About 160 ft
35	Browns Lake	Powell	516 acres	About 25 ft
36	Hubbart Reservoir	Flathead	480 acres	About 60 ft
37	Smith Lake	Flathead	453 acres	-
38	Two Medicine Lake	Glacier	424 acres	-
39	Harrison Lake	Flathead	391 acres	-
40	Spar Lake	Lincoln	383 acres	About 200 ft
41	Lake Blaine	Flathead	382 acres	-
42	Lake Sutherlin	Meagher	377 acres	About 51 ft
43	East Fork Reservoir	Granite	372 acres	-
44	Eureka Reservoir	Teton	366 acres	-
45	Glen Lake	Lincoln	301 acres	About 30 ft
46	Lake Alva	Missoula	298 acres	About 90 ft
47	Upper Thompson Lake	Lincoln	294 acres	About 100 ft
48	Lake Inez	Missoula	288 acres	About 72 ft
49	Kleinschmidt Lake	Powell	283 acres	-
50	Saint Marys Lake	Lake	273 acres	About 240 ft
51	Ackley Lake	Judith Basin	226 acres	About 39 ft
52	Loon Lake	Lincoln	222 acres	About 114 ft
53	Bair Reservoir	Meagher	221 acres	-
54	Lower Thompson Lake	Lincoln	202 acres	About 140 ft
55	Coopers Lake	Powell	200 acres	About 70 ft
56	Lower Aero Lake	Park	187 acres	About 180 ft
57	Rock Creek Lake	Powell	178 acres	-
58	Lake Ellen Wilson	Flathead	171 acres	-
59	Widewater Lake	Carbon	166 acres	About 100 ft
60	Glacier Lake	Carbon	164 acres	-
61	Hyalite Reservoir	Gallatin	158 acres	-
62	Rock Island Lake	Park	156 acres	About 100 ft
63	Lake Five	Flathead	152 acres	About 60 ft
64	Upper Two Medicine Lake	Glacier	152 acres	-
65	Beaver Lake	Flathead	144 acres	About 100 ft
66	East Rosebud Lake	Carbon	139 acres	About 20 ft
67	Red Eagle Lake	Glacier	138 acres	-
68	Lake Josephine	Glacier	130 acres	-
69	Leigh Lake	Lincoln	129 acres	-
70	Fox Lake	Park	119 acres	About 70 ft
71	Lake Elaine	Carbon	119 acres	About 140 ft
72	Cairn Lake	Carbon	116 acres	About 120 ft
73	Kersey Lake	Park	115 acres	-
74	Gunsight Lake	Glacier	114 acres	About 65 ft
75	Marl Lake	Lincoln	109 acres	-
76	Mussigbrod Lake	Beaverhead	105 acres	About 69 ft
77	Clearwater Lake	Missoula	104 acres	About 42 ft
78	Echo Lake	Granite	102 acres	About 25 ft
79	Dog Lake	Flathead	102 acres	-
80	Upper Mission Lake	Glacier	102 acres	-
81	Swiftcurrent Lake	Glacier	100 acres	-
82	Higgins Reservoir	Meagher	99 acres	-
83	Sliderock Lake	Carbon	99 acres	About 225 ft
84	Rough Lake	Park	90 acres	About 110 ft
85	East Fork Reservoir	Fergus	90 acres	-
86	Widgeon Pond	Beaverhead	90 acres	About 4 ft
87	Twin Lakes	Beaverhead	85 acres	About 46 ft
88	Lake Marshall	Missoula	80 acres	About 56 ft
89	Grinnell Lake	Glacier	79 acres	-
90	Diversion Lake	Lewis and Clark	75 acres	-
91	Savage Lake	Lincoln	71 acres	About 65 ft
92	Elbow Lake	Missoula	71 acres	-
93	Otter Lake	Carbon	71 acres	-
94	Smith Lake	Lewis and Clark	70 acres	-
95	Hope Lake	Glacier	69 acres	-
96	Thirsty Lake	Lincoln	68 acres	-
97	Lower Miner Lakes	Beaverhead	67 acres	About 33 ft
98	Lake of the Woods	Flathead	61 acres	-
99	Spoon Lake	Flathead	60 acres	-
100	Broadwater Lake	Park	59 acres	About 60 ft

Showing the 100 largest of 282 counted lakes with Brook Trout.

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