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What I've been able to find for the Hoover Dam says ~$50 million in the 1930's, today that's roughly $690 million. The entire Boulder Canyon Project cost around $165 million, which included the Hoover Dam.

The Hoover Dam has 17 hydro electric generators, capable of generating 2,074MW, which is quite large. The cost of a hydroelectric dam will be dependent on the river it crosses, the storage lake (how big does it need to be, is it man made, or already present, etc.), and how big it will be (how much electricity can it generate), and a host of other factors. I know of a 45MW (enough to power a small town, say 20,000 people) that cost $7.3 million in the 1930's.

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