I love the Dam Idea maybe use Pistons to control it. And Maybe have A ravine about not that far form the enter of the city, then you can make a Bridge.
Anyways I would like help you if you, have it up as a Server.
Sure I will help if you help back Since making a Dead Rising Resource Pack and The Willamette Parkview Mall (The Full Thing).
So just give me the server adrs. and I will help. I love making Buildings even Hotels. But the Willamette Parkview Mall, will be one massive project. but will look great with some 512x512 Textures. but I am thinking on how do the Mall. and Plan do some cases.