Montana Lakes With Green Sunfish

9 counted Montana lakes list Green Sunfish 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	Bighorn Lake	Big Horn	12,422.5 acres	About 440 ft
3	Tongue River Reservoir	Big Horn	2,112 acres	-
4	Deadmans Basin Reservoir	Wheatland	1,954 acres	-
5	Castle Rock Lake	Rosebud	155 acres	About 40 ft
6	South Sandstone Reservoir	Fallon	114 acres	About 20 ft
7	Gartside Reservoir	Richland	44 acres	About 18 ft
8	Arapooish Pond	Big Horn	29 acres	-
9	Spotted Eagle Lake	Custer	25 acres	About 10 ft

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