The Flame is a resort on the Niangua arm (LOZ) that has a covered fishing dock and caters to fisherman. Never stayed there, but know people that have and they enjoyed it.
I also know someone that rented a house on the Niangua near the Highway 54 bridge, I think. The house came with a pontoon boat. I can get the name and address of the owner if you like...good luck.
Both locations would be north of Camdenton by road.