Mill Bay Indian CasinoGravel parking for any length or size. Register at casino info. Near park, boat launch and restaurants. Can get busy on weekends. State: Washington City: Chelan Nearest Town: Manson Status; Official Cost: Free Nearest Road: Gravel Scenery Rating: 3 Months Opened: Year Round Extras: None Number of Camp Sites: 30 or more Max Stay : 3 -