Formerly known as Sanidumps.
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RV Dump Stations

Tongue River Reservoir State Park

4.5(270 reviews)
Decker, Montana, 59025, United States

About

There are two dump stations near the Marina. They have potable rinse water available, as well as non-potable rinse water. To get there, you need to go 6 miles North of Decker on Secondary 314, and then go 1 mile East on county road.

Amenities & Services

Water

Fresh Water Available (Potable)
Rinse Water Available (Non-Potable)

Reviews

4.5

Based on 270 reviews

S
Jun 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.

LH
May 8, 2024

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

J
Aug 2, 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.

JB
Aug 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.

PD
Jun 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.

Includes reviews from Google

Hours

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