Three Rivers CasinoThe Confederated Tribes of Coos, Lower Umpqua & Siuslaw Indians are actively investigating constructing an expanded Three Rivers Casino even though the current facility is less than one year old. State: Oregon City: Florence Nearest Town: Florence Status; Official Cost: Free Nearest Road: Paved Scenery Rating: Months Opened: Year Round Extras: None Number of Camp Sites: 11-29 Max Stay : 3 -