Tongue River Reservoir State Park

Tongue River Reservoir State Park is a public state park in Montana near Decker in Big Horn County. Spanning 642 acres and established in 1983, this park offers a peaceful retreat into nature for visitors of all ages.

Quick Facts

Location & Getting There

Tongue River Reservoir State Park is located near Decker, Montana. The park’s coordinates are 45.0997, -106.7944.

Explore More Montana State Parks

Tongue River Reservoir State Park is one of many outstanding state parks in Montana. Discover more parks in our Best State Parks in Montana guide, or use our Park Finder to search by activity, location, or features.

Written by

State Parks Team

Editorial Team

The State Parks Team is a group of outdoor enthusiasts, researchers, and travel writers dedicated to showcasing America's state parks. Drawing on collective experience visiting parks in all 50 states, the team creates detailed guides, curated park lists, and practical tips to help visitors make the most of their state park adventures. Our mission: making America's state parks accessible and enjoyable for everyone.

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