Tongue River Reservoir
Lake ¡ Montana
âšī¸ Community-reported spot. Details below are compiled from public sources and are reported to be accurate â always verify locally before visiting.
About this swimming hole
A Birney-area reservoir with shoreline swimming and prairie views. Tongue River Reservoir's water warms nicely. A southeastern Montana lake swim.
Good to know
| Water type | Lake |
|---|---|
| Water temperature | 70s summer |
| Depth | swim near shore |
| Best season | June-September |
| Fees | Montana State Parks day-use |
| Reservations required | No |
| Hours | sunrise-sunset |
| Parking | State park lot |
| Amenities | restrooms, picnic tables |
| County | Rosebud County |
| Nearest town | Birney |
| Safety notes | No lifeguard |
Map
Nearby swimming holes
Frequently asked questions
Does Tongue River Reservoir require reservations?
No reservations are required at Tongue River Reservoir based on current information â but verify before you go.
Is there a fee to visit Tongue River Reservoir?
Reported fee info: Montana State Parks day-use. Fees can change â confirm with the official link.
When is the best time to visit Tongue River Reservoir?
The best season is typically June-September.
â ī¸ Verify before you go. Conditions, fees, reservations, and access can change â confirm details with the official link before visiting. Last verified: September 2026