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A set of aerial photographs show the progression of The Dalles Dam, which was completed in 1956. The images help bridge the visual gap between a Columbia River flowing free and the Columbia as it is today. Pictured here is the completed dam structure, mostly built on dry land, is broken only by a single channel. 

  

100 years ago — 1920 

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The beginning construction of The Dalles Dam.  

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The remaining channel is seen prior to creation of the rock dam. 

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The site prior to construction, seen from the same direction.