Photographs of the Skagit River Hydroelectric Project constructed between 1918-1961.
<p>The Gorge Dam and Powerhouse were built by Seattle City Light and completed in September of 1924.
</p><p>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.
</p><p>Caption on image: Johnson Valve and Scross Case, Unit #1, Gorge Plant.  8-10-23.  E-500
</p><p>PH Coll 45.1-52b
</p>
<ul><li>Subjects (LCSH): Hydroelectric power plants--Washington (State)--Design and construction; Valves; Larner-Johnson Company</li></ul>
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