| Tongue River Reservoir State Park | |
| Map: | USA Montana |
| Relief: | 1 |
| Location: | Big Horn County, Montana, United States |
| Nearest Town: | Decker, Montana |
| Coordinates: | 45.0998°N -106.7945°W |
| Area Acre: | 642 |
| Elevation: | 3468feet |
| Designation: | Montana state park |
| Established: | 1983 |
| Visitation Num: | 99,232 |
| Visitation Year: | 2023 |
| Visitation Ref: | [1] |
| Administrator: | Montana Fish, Wildlife & Parks |
| Website: | Tongue River Reservoir State Park |
Tongue River Reservoir State Park is a public recreation area located 6 miles north of Decker, Montana, on the western shore of the Tongue River Reservoir. The 12-mile-long reservoir is an impoundment of the Tongue River. The state park, occupying 642 acres at an elevation of 3468 feet, offers boating, fishing, camping, swimming, wildlife viewing, and a seasonal marina.
This state park offers a 3,600 acre reservoir that is regularly stocked for fishing. Management emphases is for crappie, smallmouth bass, northern pike, and walleye.[2]
| Family | Class | Native to MT | ||
|---|---|---|---|---|
| Black Bullhead | Catfish | Warmwater | Introduced | |
| Black Crappie | Sunfish | Warmwater | Introduced | |
| Bluegill | Sunfish | Warmwater | Introduced | |
| Brown Trout | Trout | Coldwater | Introduced | |
| Channel Catfish | Catfish | Warmwater | Native | |
| Common Carp | Minnow | Warmwater | Introduced | |
| Fathead Minnow | Minnow | Warmwater | Native | |
| Golden Shiner | Minnow | Warmwater | Introduced | |
| Green Sunfish | Sunfish | Warmwater | Introduced | |
| Largemouth Bass | Sunfish | Warmwater | Introduced | |
| Longnose Dace | Minnow | Warmwater | Native | |
| Longnose Sucker | Sucker | Warmwater | Native | |
| Northern Pike | Pike | Warmwater | Introduced | |
| Pumpkinseed | Sunfish | Warmwater | Introduced | |
| Rock Bass | Sunfish | Warmwater | Introduced | |
| Sauger | Perch | Warmwater | Native | |
| Shorthead Redhorse | Sucker | Warmwater | Native | |
| Smallmouth Bass | Sunfish | Warmwater | Introduced | |
| Spottail Shiner | Minnow | Warmwater | Introduced | |
| Stonecat | Catfish | Native | ||
| Walleye | Perch | Warmwater | Introduced | |
| White Crappie | Sunfish | Warmwater | Introduced | |
| White Sucker | Sucker | Warmwater | Native | |
| Yellow Bullhead | Catfish | Warmwater | Introduced | |
| Yellow Perch | Perch | Warmwater | Introduced |