The U.S. Army Corps of Engineers is gutting and rebuilding a large section of Bonneville Dam’s fish ladder to make it easier ...

but the flume and dam have not been operational since the 1930s, according to the university. Stanford added a fish ladder in 1954 to help the steelhead move over the structure, but the ladder was ...

Fish ladders look like a series of small waterfalls alongside a dam. Salmon swim upstream, and they "jump" from one waterfall to the next, until they reach the reservoir at the top of the dam.