Sturgeons...are considered to be among the world’s most endangered and threatened fishes. This research shows that fish ladders can be built to provide upstream passage for white sturgeon, and indicates that ladders can be built for other species as well. In the Columbia River Basin, further research is needed to understand how ongoing changes to operations at hydroelectric dams to benefit migrating salmonids may influence upstream or downstream passage by white sturgeon.
White sturgeon resided within the ladders for periods ranging from 1 minute to nearly 6 months.
In this photo, the gates are not that much further open than in the street view above, but they are making a bigger splash.
|The Dalles Dam Visitor Center|
I saw this "trench" labeled the fish channel. But I have not been able to figure out what it does.