I moved up here from Colo. The closest any one of best in the state for multi species is Tongue River Reservoir. It is on the Wyoming Montana line just out of Sheridan, Wyo. But he lake is in Mt. Go to The tongue river res. website, get phone number and call Bob the head ranger( that is who will answer) and he will update you. We are heading there in a few days. We live just north of Billings. Was out fishing today and ran into a guy that said they have been doing really food down there lately. Main species are crappie, perch, pike and bass. also cats and walleye. Good luck.