San Diego Old Mission Dam- Vintage Photos and Diagram 

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A proof image of my great grandfather looking over the Old Mission Dam structure.  Circa 1913
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A great diagram, unknown source, of the cross section of the flume area- Old Mission Dam, San Diego. 
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A famous image of Lee Passmore upon "re" finding the flumes from the Old Mission Dam. In the family it was told that he was photographing landscape views and saw "lines" in the hills and investigated them at a later date.
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Road along side the Old Mission Dam on the south side of the dam. Not sure if this is the current road used or an older road. 
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Lee's wife, Lida, posed for many of his images I assume to add a human element and for scale.  Circa 1913