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Tongue River Reservoir

Overview

Tongue River Reservoir State Park offers a refreshing blue oasis set against the rugged, high plains landscape of southeastern Montana. Stretching twelve miles across, this reservoir is a premier destination for those seeking water-based recreation in a peaceful, remote setting. The park is renowned for its exceptional fishing opportunities and expansive views of the red shale bluffs that line the water. Whether you are passing through on a cross-country journey or planning a week-long fishing expedition, the park provides a scenic backdrop for a quiet outdoor escape.

Location & Surroundings

Located in Decker, MT, just north of the Wyoming border, the park is surrounded by stark prairie landscapes and juniper-dotted hills. The isolation of this region ensures that visitors experience incredible dark skies at night and a true sense of solitude during the day. The reservoir itself is the primary draw, carving a deep blue path through the dry, rolling terrain. RVers will find the drive into the park manageable, though the wide-open spaces and minimal local traffic highlight the area's rural character.

Amenities & Park Features

The park features several camping loops tailored for different needs, including the popular Campers Point. Travelers will find electric hookups at many sites, accommodating larger rigs with 50-amp service. While the park maintains a rustic charm, essential facilities such as vault toilets and fish cleaning stations are available for convenience. For boaters, the park provides multiple boat ramps and a dump station, making it easy to manage your rig and enjoy the water in one place.

Nearby Attractions & Things to Do

The primary activity here is undoubtedly on the water. Anglers frequent the reservoir for its state-record-sized fish, specifically walleye, crappie, and northern pike. Beyond the water, history buffs can explore the nearby Rosebud Battlefield State Park, which offers insight into the region's complex tribal and military past. Bird watching is also a favorite pastime, as the reservoir attracts various migratory species. The vast acreage provides ample room for hiking along the shorelines or simply enjoying the tranquil vistas.

Who This Park Is Best For

This destination is ideal for self-contained RV travelers who prioritize natural beauty and outdoor activity over resort-style amenities. It is a haven for fishing enthusiasts and boaters who want direct access to the water without the crowds often found at more commercial lakes. Families looking for a quiet place to swim and stargaze will find the environment welcoming. If you value scenic solitude and the freedom of the Montana high plains, this park fits your travel style perfectly.

Amenities

- Recreational Facilities

• River
• Swimming
• Fishing
• Ramp
• Body Of Water (Tongue River)
• Watersports

- Policies

• Pets Welcome
• Tent Camping Allowed

- Other Amenities & Services

• Pit Toilets

- Facility

• Type (State Park)
• Partial Handicap Access

- On-Site Rentals

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- Sites

• Spaces Available (150)
• Paved Sites (40)
• Grass Sites (110)
• Electric (40)
• No Hookups (27)
• Fire Rings

- Recreation Nearby (within 10 miles)

• Fishing
• Boating
• Watersports

User Reviews

cat59b broncos

June 29, 2025

I liked it it's a nice quiet Lake and my Thursday couldn't have got a better picture perfect weather wise I mean there wasn't even a ripple on the lake from most of the day

William “Bill” Pugliano

June 10, 2025

Absolutely awesome place to go for boating, fishing, camping, or all of the above activities! Great sites with easy access to water, trash, and bathrooms. Super safe location with plenty of staff around and a facility to shop in for basic needs. Fish cleaning stations as well when the fishing is good! Plan ahead and get to enjoying this adventure.

Lorretta Holmes

May 08, 2024

Beautiful lake. Great place . Electric hookup. They do have a dump site, but no fresh water that we could see.

jim collins

November 17, 2023

Camp here on November 17th. 2023. No one is here. Temperatures are still holding in the upper 50's. Sites 1 through 11 have 50 amp service there is no water dump station is still open all year. Veterans can camp for $13 a night. This has been very enjoyable. Definitely will come back again.

jwasylyk

August 02, 2023

Only spent a night on a stop over. Beautiful spot. Most sites are easy water access. Looked like a great place to fish. Sites are quite spread out. Really good stocked store at the campground. Awesome place. Hope to make it back someday.

Jason B

August 23, 2022

Nice park/RV/Camping! Very beautiful scenery, good fishing (even from shore). The staff at marina store were very nice. The only down fall I could see was no showers for people like me who tent camp.

Paul Dodson

June 29, 2020

A wonderful place to go. Spent five days there and had a great time. They have places to camp with electric and without. We stayed at rattlesnake camp ground. No electric but had public restroom and fire ring. Only a few sites there so it was quit. Loved it and recommended it. The lady who owns the marine was very delightful. You got to try their Indian tacos on Saturdays and burgers any other day. A little pricey, but we'll worth it. UPDATE....Just got back from out third year family reunion at tongue river. Another great week. I want to add a "ata boy" to the folks at the Tongue River Parks office. We had a camper snap an axle while there. We went to Sheridan and spent half a day trying to find a new one, or someone to weld this one. In desperation we went to the Parks office and they gladly let us use their shop, wielder and tools to fix our axle and get it back on the road. Thank you guys for making a bad situation much better. Just for the record, my weld held and we got it the 200 miles back home.

Map for Tongue River Reservoir

Contact information