Columbia River System Overview
Looking at the aerial photo at the top of these notes, the fish ladder was part of the original construction.
But the fish bypass was added later.
The bypass pipe starts on the other side of the dam at the end of the powerhouse.
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| 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. |
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| 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. |
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| 1 of 25 photos of other subjects posted by Scott Butner Order here: https://scottbutnerphotography.squarespace.com/readytohang-wall-art/p/rocky-reach |
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| Rocky Reach Discovery Center posted This photo, taken in 1957, shows the spillway aprons during construction of the dam. Did you know: each of the 12 spillway gates can release 100,000 cubic feet of water per second? That's a lot of water, and the force of that flow can wash away the riverbed. Spillway aprons are placed in front of spillways to dissipate the massive force the Columbia River would suddenly place on the riverbed. Vic White: You might want to double check your #s. 100k per second per gate is pretty high. When the Columbia is rocking and rolling it is around 300k per second. Tyler Sikes: Vic White 100kcfs per gate is the absolute worst case scenario- think dam failures upstream. [The figure of 100kcfs per gate shocked me as well. That was the capacity of the entire original Oroville Dam spillway.] |
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 |
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| 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.
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| ChelanPUD-discovery |
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| LakeChelanNow An expanded and remodeled Discover Center opened in 2021. |
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| 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.] |
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