Lakes / Montana / Sweet Grass County

Lakes in Sweet Grass County, Montana

34 lakes counted in Sweet Grass County - the largest is Glass Lindsay Lakes Lower Reservoir at 522.4 acres.

Lakes Counted

522.4 acres

Largest - Glass Lindsay Lakes Lower Reservoir

Sweet Grass County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.

All Counted Lakes

#	Lake	County	Surface Area	Max Depth
1	Glass Lindsay Lakes Lower Reservoir	Sweet Grass	522.4 acres	-
2	Upper Glaston Lake	Sweet Grass	334 acres	-
3	Lake Pinchot	Sweet Grass	74 acres	-
4	Rein Lake	Sweet Grass	65.6 acres	-
5	Lightning Lake	Sweet Grass	55 acres	About 120 ft
6	Wounded Man Lake	Sweet Grass	39 acres	About 55 ft
7	Pentad Lake	Sweet Grass	30 acres	About 50 ft
8	Lavold Reservoir	Sweet Grass	29.7 acres	-
9	Jay Lake	Sweet Grass	27 acres	-
10	Rainbow Lakes	Sweet Grass	25.9 acres	-
11	Mirror Lake	Sweet Grass	23 acres	About 80 ft
12	Swamp Lake	Sweet Grass	23 acres	-
13	Fish Lake	Sweet Grass	17 acres	About 40 ft
14	Crazy Lake	Sweet Grass	16 acres	-
15	Owl Lake	Sweet Grass	16 acres	About 30 ft
16	Favonius Lake	Sweet Grass	15 acres	About 15 ft
17	Horseshoe Lake	Sweet Grass	14 acres	About 10 ft
18	Jordan Lake	Sweet Grass	14 acres	About 30 ft
19	Sunken Rock Lake	Sweet Grass	14 acres	-
20	Martes Lake	Sweet Grass	13 acres	-
21	Camp Lake	Sweet Grass	12 acres	About 50 ft
22	Burnt Gulch Lake	Sweet Grass	11 acres	About 45 ft
23	Blue Lake	Sweet Grass	10 acres	About 20 ft
24	Lake Diaphanous	Sweet Grass	9 acres	About 25 ft
25	Chalice Lake	Sweet Grass	9 acres	About 30 ft
26	Clam Lake	Sweet Grass	8 acres	About 40 ft
27	Pipit Lake	Sweet Grass	8 acres	About 25 ft
28	Lake Columbine	Sweet Grass	8 acres	About 10 ft
29	Mouse Lake	Sweet Grass	8 acres	About 30 ft
30	Sundown Lake	Sweet Grass	7 acres	-
31	Cascade Lake	Sweet Grass	6 acres	-
32	Hidden Lake	Sweet Grass	5 acres	-
33	Divide Creek Lake	Sweet Grass	4 acres	About 3 ft
34	Emerald Lake	Sweet Grass	3 acres	About 20 ft

Sources: Montana Fish, Wildlife & Parks lake data; USGS. Verified October 30, 2026.