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1-526: 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. This state park offers
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