Reviving a river: Checking in at Great Works Dam
The two big timber crib sections in the background are nearly demolished! Two excavators in the foreground are demolishing another concrete section with hoe rams (impressive hydraulic hammers that have 4-5 tons of impact).
In the center of the photo, the excavator near the dam is completing a fish passage channel that will become the thalweg of the river, or its lowest point. After that is complete, the coffer dam will be removed, and the water will drop to something close to the new level.