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State Park

Photo: User:MagicpianoCC BY-SA 4.0Wikimedia Commons

Tongue River Reservoir

Montana · MT

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Managed by Montana FWP

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We display cached information from agency feeds. Hours, fees, permits, closures, fire restrictions, and conditions change without notice. Outdoors is not the permitting authority. Confirm current conditions for this park using the links above before you go — you are responsible for compliance. Last verified by us: Oct 25, 2026. Spot an error in our data?

About

Tongue River Reservoir is a long, scenic body of water located in southeastern Montana, surrounded by striking red shale formations, juniper canyons, and wide-open prairie. The reservoir was created as part of the Tongue River Dam project, which was completed in the 1950s to provide irrigation and flood control. Its distinctive landscape offers a unique blend of rugged terrain and expansive views, making it a notable spot for outdoor enthusiasts. Visitors to Tongue River Reservoir can enjoy a variety of activities, including fishing, boating, swimming, and camping. The area offers boat access for those looking to explore the water, while fishing opportunities abound for species like trout and walleye. The reservoir is relatively remote, so it's advisable to plan ahead for parking and to check local weather conditions. As always, it's best to verify hours, fees, and any closures on the official state site before visiting.

Source: fwp.mt.gov

From Wikipedia

Tongue River Reservoir State Park is a public recreation area located 6 miles north of Decker, Montana, on the western shore of the Tongue River Reservoir. The 12-mile-long reservoir is an impoundment of the Tongue River. The state park, occupying 642 acres at an elevation of 3468 feet, offers boating, fishing, camping, swimming, wildlife viewing, and a seasonal marina.

Source: Wikipedia — text licensed CC BY-SA 4.0. Verify alerts and operational details with the managing agency below.

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Hunting in this park

This park overlaps hunting unit

During hunting seasons, wear blaze orange and check regulations — see the Montana hunting page

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