Tongue River Reservoir State Park
Tongue River Reservoir State Park is a scenic eastern Montana park centered on a large reservoir known for boating, fishing, and wildlife viewing. Rolling prairie, cottonwood-lined shorelines, and open water create a quiet setting for camping, picnicking, and year-round recreation.
Free
Visiting with Dogs
Dogs allowed; keep on leash, clean up after pets, and follow posted rules. Check seasonal restrictions before visiting.
Visitor Tips & Reviews
What Visitors Say
Quiet reservoir park loved for boating, fishing, camping, birdwatching, and wide-open views. Visitors praise peaceful sunsets, spacious sites, and a relaxed, uncrowded atmosphere.
Tips from Visitors
- Bring insect repellent for mosquitoes near the water.
- Check wind conditions before boating or paddleboarding.
- Pack extra drinking water and sun protection.
- Use designated campsites and follow posted fire rules.
- Watch for sudden weather changes on the reservoir.
- Keep pets leashed and clean up after them.
Best Time to Visit
The best time to visit Tongue River Reservoir State Park is late spring through early fall, when warm weather makes boating, camping, and shoreline fishing most enjoyable. Spring and fall often bring fewer crowds and active wildlife.
Amenities
Nearby Attractions
Explore these attractions near Tongue River Reservoir State Park:
- Tongue River ReservoirThe reservoir itself is the main attraction, offering boating, fishing, and wildlife viewing along miles of shoreline.Within the park
- Decker Schoolhouse MuseumA small local history stop that reflects the ranching and community heritage of the Decker area.2 miles away
- Bighorn Canyon National Recreation AreaA dramatic canyon and lake landscape with scenic overlooks, boating, and hiking opportunities within a reasonable drive.55 miles away
Things to Do at Tongue River Reservoir State Park
Camping at Tongue River Reservoir State Park
Tent and RV camping available with hookups, restrooms, showers, picnic areas, and reservoir access; reservations recommended in peak season.
Hiking Trails
Tongue River Reservoir State Park offers easy, scenic day hiking with gentle trails and shoreline views that are popular with families and casual walkers. Reviews often mention peaceful water access, birdwatching, and open prairie scenery rather than challenging terrain. Trails are generally straightforward and best for a relaxed outing, especially in spring, summer, and fall when the weather is mild.
Tongue River Reservoir Shoreline Trail
EasyA scenic lakeside route with broad reservoir views, birdwatching opportunities, and access to picnic and day-use areas.
North Shore Loop
EasyA gentle loop along the north side of the reservoir with open water vistas, cottonwood areas, and frequent wildlife sightings.
South Bay Access Trail
EasyA short, relaxed trail connecting shoreline access points and quiet coves, ideal for a casual hike or family outing.
Reservoir Overlook Trail
ModerateA slightly steeper trail leading to elevated viewpoints over the reservoir and surrounding prairie landscape.
Directions
From Decker, drive north on Tongue River Road about 2 miles, then follow park signs to the reservoir access areas and campground.
Contact & Info
Frequently Asked Questions
What are the main things to do at Tongue River Reservoir State Park?
Visitors commonly come for boating, fishing, swimming, picnicking, and camping. Many reviews mention it as a quiet place to relax on the water, especially for fishing and enjoying lake views.
Is the water good for swimming and boating?
Yes, many visitors use the reservoir for swimming and boating in warmer months. Conditions can vary with wind and water levels, so boaters should check weather and be prepared for changing lake conditions.
What kind of fishing can I expect there?
Fishing is one of the park’s most popular activities. Anglers often target species common to Montana reservoirs, and reviews frequently mention good shore and boat fishing. Success can vary by season and water conditions.
Are there camping facilities at the park?
Yes, the park offers camping, and visitors often describe it as a peaceful, low-key place to stay. Amenities may be simple compared with larger parks, so it’s a good idea to check current site and facility details before arriving.
Is Tongue River Reservoir State Park crowded?
It is often described as less crowded than many larger state parks. Reviewers like the quieter atmosphere, especially on weekdays. Summer weekends can still be busier, particularly near the water and popular camping areas.
What should I know before visiting?
Bring supplies, sun protection, and water, since services may be limited. Wind can affect boating, and weather can change quickly. Many visitors recommend checking current conditions and park alerts before heading out.

Don’t Forget the Essentials
Essential camping & hiking gear we recommend to make your park trip easier and more comfortable.
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