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>A penstock is a conduit or pipe for concentrating the flow of water from a dam reservoir to a powerhouse, resulting in increased water pressure for electrical generation.
</p><p>Caption on image: Penstock Tunnels, April 1922.  F202
</p><p>PH Coll 45.1-29a
</p>
<ul><li>Subjects (LCTGM): Tunnels--Washington (State); Penstocks--Washington (State); Excavation--Washington (State)</li>
<li>Subjects (LCSH): Dams--Washington (State)--Design and construction</li></ul>
<div class="fn value">
Unknown author<span style="display: none;">Unknown author</span></div>
Taken on 1 April 1922
<a rel="nofollow" class="external text" href="https://content.lib.washington.edu/ww-spwsweb/index.html">Seattle Power and Water Supply Collection</a>