1961 1.3gw Rocky Reach Dam on Columbia River near Sunnyslope, WA

(Satellite)

cbr
Four 132mw units were part of the original 1961 construction and seven 117mw units were added in 1971 for a nameplate capacity of 1,347mw. The total hydraulic capacity is 220 kcfs.

 

ChelanPUD-dam
[This source indicates that it was built with 7 units and that 4 generators were added in 1971. It makes sense that the four larger units were added later.]
The dam was 1694' (516m) long and 125' (38m) high.
"In 2006, the PUD completed a major upgrade of the powerhouse. Starting in 1995, the District installed new adjustable-blade turbine runners on all 11 generating units and also rehabilitated unit generators. The work improves the efficiency and reliability of the hydro plant. The end result is more power generation, higher revenues and lower maintenance costs. In addition, the new turbine runners are 'fish friendly,' designed to reduce juvenile salmon and steelhead mortality."
The four units were added to make use of water released from storage dams that were added upstream.

1 of 25 photos of other subjects posted by Scott Butner
Order here: https://scottbutnerphotography.squarespace.com/readytohang-wall-art/p/rocky-reach

Looking at the aerial photo at the top of these notes, the fish ladder was part of the original construction.

Satellite

But the fish bypass was added later.

Satellite

The bypass pipe starts on the other side of the dam at the end of the powerhouse.

Satellite

ResearchGate, Figure 1

From what I can determine, the bypass is part of a project to measure survival rate of Chinook. The goal was 91%, and they measured roughly 94%. [WenatcheeWorld]

This dam has a fancy visitor center called a Discovery Center.

ChelanPUD-discovery

LakeChelanNow
An expanded and remodeled Discover Center opened in 2021.

WenatcheeWorld (source)
"Chelan County PUD's Rocky Reach Dam sees 93.78% juvenile Chinook survival rate — highest in 20 years"
[It would be nice if we could have both dams and fish.]