Tongue River Reservoir State Park - United States
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About Tongue River Reservoir State Park
RV quick facts for Tongue River Reservoir State Park
| Detail | Information |
|---|---|
| Reservation window | Reservations through Montana State Parks; first-come sites also available |
| Dump station | Dump station on site for registered campers |
| Full hookups | Limited electric-only sites; most sites are non-hookup |
| Cell service | Spotty; coverage varies by carrier in this remote corner of southeast Montana |
| Road restrictions | Gravel access road and campground loops; drive slowly with large rigs |
| Generator hours | Quiet hours apply; generators restricted overnight per park rules |
| Nearest fuel and supplies | Decker has limited services; full supplies in Sheridan, WY or Ashland, MT |
Featured RV rentals for Tongue River Reservoir State Park
Best time to visit Tongue River Reservoir State Park
Late May through mid-September is the prime window, when daytime highs are warm enough for swimming and water sports and all campground loops and boat ramps are open. July and August bring the busiest weekends and the best walleye and bass fishing, so midweek arrivals help RVers secure a site. Shoulder months of May and September offer cooler nights, lighter crowds, and strong fall fishing, but winds across the open reservoir can be strong. Winter use is limited, with ice fishing possible but most services reduced.
Reduced winter services; ice fishing possible
Cold and windy; limited winter use
Shoulder season; snow still possible
Campground services ramp up as weather allows
Strong spring winds across the reservoir
Walleye fishing picks up
Peak season; reserve early
Peak season; watch for fire restrictions
Cooler nights, lighter crowds
Many services wind down late month
Reduced services; primitive winter camping only
Reduced winter services; ice fishing possible
Things to do at Tongue River Reservoir State Park
- Walleye and Warm-Water FishingRV parking available
Tongue River Reservoir is one of Montana's top warm-water fisheries, producing walleye, crappie, smallmouth bass, northern pike, and catfish. Anglers fish from boats, the shoreline, and the dam area, and the park hosts several walleye tournaments each summer.
- Boating and Water SportsRV parking available
The roughly 12-mile-long reservoir supports motorboating, waterskiing, wakeboarding, paddleboarding, and kayaking. Multiple boat ramps and a marina give RV campers direct water access close to the campground loops.
- Swimming and Day Use EasyRV parking available
Designated swim and day-use areas offer calm coves for families during the hot summer months. Picnic tables and shoreline access make it easy to spend an afternoon between campsite and water.
- Scoria Cliff and Badland Exploration EasyRV parking available
Red scoria cliffs, rimrocks, and juniper breaks line the reservoir and surrounding uplands. Short informal walks from the campgrounds lead to overlooks of the reservoir and the Tongue River canyon below the dam.
- Wildlife Viewing EasyRV parking available
The reservoir corridor supports mule deer, white-tailed deer, pronghorn, wild turkeys, pelicans, bald eagles, and a variety of waterfowl. Early mornings near the inlet and along the shoreline are the most productive times.
- Ice Fishing (Winter) Moderate
When safe ice forms, the reservoir becomes a regional ice-fishing destination for walleye, perch, and crappie. RV access in winter is limited, and visitors should check conditions before traveling.
- Day Trip to Little Bighorn Battlefield EasyRV parking available
Little Bighorn Battlefield National Monument is roughly an hour's drive northwest of the park, making it a practical day trip from an RV basecamp. The site preserves the location of the 1876 battle and includes a visitor center, driving tour, and overlooks.
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RV Rentals Tongue River Reservoir State Park
Tongue River Reservoir State Park, MT, United States
How to get to Tongue River Reservoir State Park
The park sits off Montana Highway 314 near Decker, roughly 25 miles northeast of Sheridan, Wyoming (about a 40-minute drive) and 70 miles south of Miles City, Montana (roughly 1 hour 30 minutes). From Billings, Montana, plan on about 2 hours 30 minutes via I-90 east and MT-314 south. RV drivers should note that the final approach includes rural two-lane highways and a gravel access road with rolling grades, and the park entrance road descends to the reservoir, so trailer brakes and low-gear descents matter. The nearest airports for fly-and-rent trips are Sheridan County Airport (SHR) and Billings Logan International Airport (BIL).
RVezy vs. Traditional RV rental
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- Book directly from local RV owners
- Choose the exact RV you want
- Delivery to your campsite, home, or destination
- More variety: trailers, motorhomes, and campers
Traditional RV rental
- Limited fleet from a rental company
- Exact RV not guaranteed
- Pickup only at retail locations
- Fewer RV types and less availability