Lakes in Hill County, Montana

26 lakes counted in Hill County - the largest is Fresno Reservoir at 3,185 acres.

Lakes Counted

3,185 acres

Largest - Fresno Reservoir

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

All Counted Lakes

#	Lake	County	Surface Area	Max Depth
1	Fresno Reservoir	Hill	3,185 acres	-
2	Mud Lake	Hill	546.3 acres	-
3	Mud Lake	Hill	490.8 acres	-
4	Hingham Lake	Hill	330.4 acres	-
5	Creedman Reservoir	Hill	247.1 acres	-
6	Martin Lake	Hill	240.3 acres	-
7	Halfway Lake	Hill	239.2 acres	-
8	Mud Lake	Hill	218.6 acres	-
9	Grassy Lake	Hill	202.4 acres	-
10	Lower Lake	Hill	175.5 acres	-
11	McKinnsey Reservoir	Hill	150 acres	-
12	Chain of Lakes	Hill	147.3 acres	-
13	Chain of Lakes	Hill	146 acres	-
14	Lake Thibadeau	Hill	144.3 acres	-
15	Dry Lake	Hill	132.2 acres	-
16	Grassy Lake	Hill	111.4 acres	-
17	Burkhartsmeyer Reservoir	Hill	105 acres	-
18	Sands Lake	Hill	96.5 acres	-
19	Mud Lake	Hill	85.8 acres	-
20	Bailey Reservoir	Hill	85 acres	About 30 ft
21	Mud Lake	Hill	60.5 acres	-
22	Dry Lake	Hill	60.3 acres	-
23	Grassy Lake	Hill	50.8 acres	-
24	Bearpaw Lake	Hill	48 acres	-
25	Sage Lake	Hill	43.2 acres	-
26	Diversion	Hill	27.5 acres	-

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