Aerial view of San Gabriel Dam No. 1, the highest earth-filled dam in the world. Photo shows the down stream side. At lower right is the 30-foot penstock which served as a diversion tunnel during the construction. The dam is 1500 feet long on top, 381 feet high. It is built of six zones of different materials to achieve earthquake-proof construction. Chief value of the dam, which spans the San Gabriel canyon above Azusa, is to regulate run-off, preventing flooding of orchards and ranches along the lower San Gabriel river. Photo dated: July 20, 1937.
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