[aerohead]

Originally Posted by Vman455

Yeah, but they're very wide--the smallest are a couple thousand feet, and the largest more than 8,000 feet across (Hoover dam, in contrast, is 1,200 feet wide). I imagine being able to make a dam that wide in order to get enough volume to offset the low height only works in a few places where the topography lends itself to that. Also, 200 feet is still pretty high, and most of the Midwest wouldn't support that kind of dam height without significant berms.

Niagara Falls is only 160-feet.Con Edison continues to harvest it for power.