Lakes / Montana / Fish Species / Rainbow Trout

Montana Lakes With Rainbow Trout

457 counted Montana lakes list Rainbow 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	Flathead Lake	Lake	122,132 acres	About 380 ft
3	Canyon Ferry Lake	Broadwater	32,773 acres	About 170 ft
4	Lake Koocanusa	Lincoln	28,723 acres	-
5	Lake Elwell	Liberty	14,842 acres	About 150 ft
6	Hebgen Lake	Gallatin	12,564 acres	About 80 ft
7	Bighorn Lake	Big Horn	12,422.5 acres	About 440 ft
8	Noxon Reservoir	Sanders	7,592 acres	-
9	Lake McDonald	Flathead	6,867 acres	-
10	Clark Canyon Reservoir	Beaverhead	4,815 acres	About 91 ft
11	Lima Reservoir	Beaverhead	4,422 acres	-
12	Saint Mary Lake	Glacier	3,933 acres	-
13	Ennis Lake	Madison	3,692 acres	-
14	Holter Lake	Lewis and Clark	3,667 acres	-
15	Lake Frances	Pondera	3,618 acres	About 43 ft
16	Swan Lake	Lake	3,269 acres	About 120 ft
17	Bynum Reservoir	Teton	3,205 acres	-
18	Hauser Lake	Lewis and Clark	3,200 acres	About 65 ft
19	Fresno Reservoir	Hill	3,185 acres	-
20	Little Bitterroot Lake	Flathead	2,970 acres	About 260 ft
21	Cabinet Gorge Reservoir	Sanders	2,848 acres	-
22	Georgetown Lake	Granite	2,818 acres	About 25 ft
23	Freezeout Lake	Teton	2,596 acres	-
24	Lower Saint Mary Lake	Glacier	2,177 acres	-
25	Lake Helena	Lewis and Clark	2,073 acres	About 12 ft
26	Deadmans Basin Reservoir	Wheatland	1,954 acres	-
27	Pablo Reservoir	Lake	1,650 acres	-
28	McGregor Lake	Flathead	1,522 acres	About 220 ft
29	Pishkun Reservoir	Teton	1,518 acres	About 78 ft
30	Lake Mary Ronan	Lake	1,513 acres	About 40 ft
31	Duck Lake	Glacier	1,446 acres	-
32	Lake Sherburne	Glacier	1,368 acres	About 60 ft
33	Willow Creek Reservoir	Lewis and Clark	1,314 acres	About 50 ft
34	Gibson Reservoir	Lewis and Clark	1,289 acres	About 165 ft
35	Placid Lake	Missoula	1,212 acres	About 93 ft
36	Tally Lake	Flathead	1,211 acres	About 450 ft
37	Ninepipe Reservoir	Lake	1,203 acres	-
38	Bull Lake	Lincoln	1,162 acres	About 60 ft
39	Seeley Lake	Missoula	1,031 acres	About 120 ft
40	Upper Waterton Lake	Glacier	1,009 acres	-
41	Thompson Falls Reservoir	Sanders	969 acres	-
42	Martinsdale Reservoir	Meagher	947 acres	-
43	Ruby River Reservoir	Madison	941 acres	-
44	Lake Como	Ravalli	911 acres	-
45	Lindbergh Lake	Missoula	815 acres	About 120 ft
46	Mission Lake	Glacier	755 acres	-
47	Cooney Reservoir	Carbon	733 acres	-
48	Four Horns Lake	Glacier	719 acres	-
49	Willow Creek Reservoir	Madison	713 acres	-
50	Echo Lake	Flathead	695 acres	About 70 ft
51	Upper Holter Lake	Lewis and Clark	695 acres	-
52	Kicking Horse Reservoir	Lake	657 acres	-
53	Salmon Lake	Missoula	631 acres	About 65 ft
54	Earthquake Lake	Madison	612 acres	About 120 ft
55	Cliff Lake	Madison	608 acres	-
56	Upper Stillwater Lake	Flathead	592 acres	-
57	Dickey Lake	Lincoln	585 acres	About 70 ft
58	Middle Thompson Lake	Lincoln	557 acres	About 160 ft
59	Lodge Grass Storage Reservoir	Big Horn	534 acres	-
60	Nilan Reservoir	Lewis and Clark	521 acres	-
61	Petrolia Lake	Petroleum	518 acres	-
62	Browns Lake	Powell	516 acres	About 25 ft
63	Hubbart Reservoir	Flathead	480 acres	About 60 ft
64	Smith Lake	Flathead	453 acres	-
65	Swift Reservoir	Pondera	450 acres	-
66	Yellow Water Reservoir	Petroleum	442 acres	-
67	Mystic Lake	Stillwater	436 acres	-
68	Two Medicine Lake	Glacier	424 acres	-
69	Holland Lake	Missoula	414 acres	About 140 ft
70	Harrison Lake	Flathead	391 acres	-
71	Spar Lake	Lincoln	383 acres	About 200 ft
72	Lake Blaine	Flathead	382 acres	-
73	Lake Sutherlin	Meagher	377 acres	About 51 ft
74	East Fork Reservoir	Granite	372 acres	-
75	Eureka Reservoir	Teton	366 acres	-
76	Nevada Lake	Powell	337 acres	About 65 ft
77	Frazer Lake	Valley	310 acres	-
78	Lebo Lake	Wheatland	309 acres	-
79	Glen Lake	Lincoln	301 acres	About 30 ft
80	Silver Lake	Deer Lodge	300 acres	-
81	Lake Alva	Missoula	298 acres	About 90 ft
82	Upper Thompson Lake	Lincoln	294 acres	About 100 ft
83	Lake Inez	Missoula	288 acres	About 72 ft
84	Lower Crow Reservoir	Lake	286 acres	-
85	Elk Lake	Beaverhead	283 acres	About 62 ft
86	Saint Marys Lake	Lake	273 acres	About 240 ft
87	Glenns Lake	Glacier	262 acres	-
88	Lower Stillwater Lake	Flathead	250 acres	About 50 ft
89	Egan Slough	Flathead	249 acres	-
90	Foy Lake	Flathead	241 acres	About 120 ft
91	Ackley Lake	Judith Basin	226 acres	About 39 ft
92	Loon Lake	Lincoln	222 acres	About 114 ft
93	Cosley Lake	Glacier	222 acres	-
94	Sophie Lake	Lincoln	221 acres	About 50 ft
95	Bair Reservoir	Meagher	221 acres	-
96	Horn Lake	Pondera	219 acres	-
97	Rainbow Lake	Sanders	209 acres	About 30 ft
98	Dailey Lake	Park	206 acres	About 22 ft
99	Flat Lake	Sheridan	204 acres	-
100	Lower Thompson Lake	Lincoln	202 acres	About 140 ft

Showing the 100 largest of 457 counted lakes with Rainbow Trout.

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