I stayed for 3 days in Yi Chang. I was lucky to get access to the top of the Three Gorges to witness the most spectucular view of three gorges dam. 4 tunnels are openned to let go excessive water from a recent flood. The long tunel (in the end) was used to get ride of floating objects and it is always open. I was told by my elder brother that they're building four more dams that total 2 three gorges in terms of investment.