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Construction activities at Larner-Johnson flow control valve and scroll case in power generating unit no. 1, Gorge Dam Powerhouse, August 10, 1923
Construction activities at Larner-Johnson flow control valve and scroll case in power generating unit no. 1, Gorge Dam Powerhouse, August 10, 1923
TitleConstruction activities at Larner-Johnson flow control valve and scroll case in power generating unit no. 1, Gorge Dam Powerhouse, August 10, 1923
PhotographerUnknown
Date1923
NotesPhotographs of the Skagit River Hydroelectric Project constructed between 1918-1961.

The Gorge Dam and Powerhouse were built by Seattle City Light and completed in September of 1924.

Water flows from the penstock through the dam and into a spiral "scroll case". Directed through slots on the inner diameter of the scroll case the water falls through the turbine, causing it to spin. Finally the water enters the "draft tube". The larger diameter of this steel outlet tube slows the water before it exits the dam on the downstream side. A Larner-Johnson valve is used to control the outflow of water.

Caption on image: Johnson Valve and Scross Case, Unit #1, Gorge Plant. 8-10-23. E-500

PH Coll 45.1-52b
Location DepictedUnited States--Washington (State)--Skagit River--Gorge Dam Powerhouse
Subjects (LCSH)Hydroelectric power plants--Washington (State)--Design and construction; Valves; Larner-Johnson Company
Digital CollectionSeattle Power and Water Supply Collection
Order NumberWWDL0370
Ordering InformationTo order a reproduction, inquire about permissions, or for information about prices see: http://www.lib.washington.edu/specialcollections/services/reproduction-info
Please cite the Order Number when ordering.
RepositoryUniversity of Washington Libraries. Special Collections Division
Repository CollectionSeattle City Light Albums. PH Coll 45
Object TypePhotograph
Physical Descriptionsilver gelatin, b&w
Digital Reproduction InformationScanned from a photographic print using a Microtek Scanmaker 9600XL at 150 dpi in JPEG format at compression rate 3 and resized to 768x600 ppi. 2005
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