Diversion Tunnels

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  • Keep Out signs erected by the insurance department of Six Companies, Inc. one mile upstream from the Nevada diversion tunnels. 08/09/1931

    Signs erected by the insurance department of Six Companies, Inc., near the River Camp, approximately one mile upstream from the Nevada diversion tunnels. 08/09/1931...Show more

    Signs erected by the insurance department of Six Companies, Inc., near the River Camp, approximately one mile upstream from the Nevada diversion tunnels. 08/09/1931

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  • The first step in driving the 56-foot diameter diversion tunnels on the Hoover Dam project was the construction of pilot tunnels. 08/26/1931

    The first step in driving the 56-foot diameter diversion tunnels on the Hoover Dam project was the construction of pilot tunnels. These are 12x12 feet and were later e...Show more

    The first step in driving the 56-foot diameter diversion tunnels on the Hoover Dam project was the construction of pilot tunnels. These are 12x12 feet and were later enlarged to the full diameter of 56 feet. 08/26/1931

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  • Drillers in a 12 by 12 foot top-heading, in diversion Tunnel #3, Arizona side. 09/10/1931

    Drillers in a 12 by 12 foot top-heading, in diversion Tunnel #3, Arizona side. 09/10/1931

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  • The concrete arch coffer dams are being blasted out of the lower portals of diversion tunnels, shown here Tunnel #2.05/15/1932

    The concrete arch coffer dams are being blasted out of the lower portals of diversion tunnels. View shows Diversion Tunnel No. 2. 05/15/1932

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  • Looking out of the lower portal of Diversion Tunnel No. 2. 01/25/1932

    Looking out of the lower portal of Diversion Tunnel No. 2. Note the size of the men in the entrance. 01/25/1932

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  • Detail view of construction of steel form for lining the arch sections of the diversion tunnels. 06/10/1932

    Detail view of construction of steel form for lining the arch sections of the diversion tunnels. 06/10/1932

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  • Apparatus devised for drilling grout holes through the concrete lining of the diversion tunnels. 07/23/1932

    Apparatus devised for drilling grout holes through the concrete lining of the diversion tunnels. Air drills are mounted on bars. The grouting jumbo travels on rails la...Show more

    Apparatus devised for drilling grout holes through the concrete lining of the diversion tunnels. Air drills are mounted on bars. The grouting jumbo travels on rails laid on the invert floor. 07/23/1932

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  • Nevada Inclined Spillway Tunnel leading down into Diversion Tunnel No. 1. 09/28/1932

    Nevada Inclined Spillway Tunnel leading down into Diversion Tunnel No. 1. 09/28/1932

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  • Looking upstream in Number 4 raise and plug. 03/28/1934

    Looking upstream in Number 4 raise and plug. 03/28/1934

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  • Looking downstream into No. 4 Raise, showing close-up of portal forms. 10/25/1934

    Looking downstream into No. 4 Raise, showing close-up of portal forms. 10/25/1934

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  • Looking upstream in No. 2 Diversion Tunnel, showing the concrete pipeline from the pumpcrete gun to the upstream plug. 10/30/1934

    Looking upstream in No. 2 Diversion Tunnel, showing the concrete pipeline from the pumpcrete gun to the upstream plug. 10/30/1934

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    Keep Out signs erected by the insurance department of Six Companies, Inc. one mile upstream from the Nevada diversion tunnels. 08/09/1931
    The first step in driving the 56-foot diameter diversion tunnels on the Hoover Dam project was the construction of pilot tunnels. 08/26/1931
    Drillers in a 12 by 12 foot top-heading, in diversion Tunnel #3, Arizona side. 09/10/1931
    The concrete arch coffer dams are being blasted out of the lower portals of diversion tunnels, shown here Tunnel #2.05/15/1932
    Looking out of the lower portal of Diversion Tunnel No. 2. 01/25/1932
    Detail view of construction of steel form for lining the arch sections of the diversion tunnels. 06/10/1932
    Apparatus devised for drilling grout holes through the concrete lining of the diversion tunnels. 07/23/1932
    Nevada Inclined Spillway Tunnel leading down into Diversion Tunnel No. 1. 09/28/1932
    Looking upstream in Number 4 raise and plug. 03/28/1934
    Looking downstream into No. 4 Raise, showing close-up of portal forms. 10/25/1934
    Looking upstream in No. 2 Diversion Tunnel, showing the concrete pipeline from the pumpcrete gun to the upstream plug. 10/30/1934