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    Rocks Below Bonneville Dam

    OR, UNITED STATES

    11.02.2011

    Video by Matt Rabe 

    U.S. Army Corps of Engineers, Portland District

    Basalt rocks ranging in size from 1-4 feet in diameter are trapped below the spillway at Bonneville Dam. The U.S. Army Corps of Engineers needs to remove the rocks -- about 550 cubic yards -- before the Spring spill season begins. When water spills over the spillway, the rocks move in a fashion known as "ball milling" which erodes the concrete. The rocks entered the spillway in 2011 when the Columbia River experienced significant high flows during most of the Spring and Summer.

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    VIDEO INFO

    Date Taken: 11.02.2011
    Date Posted: 01.11.2012 12:05
    Category: B-Roll
    Video ID: 134705
    VIRIN: 120111-A-RD042-001
    Filename: DOD_100305197
    Length: 00:00:21
    Location: OR, US

    Web Views: 109
    Downloads: 0
    High-Res. Downloads: 0
    Podcast Hits: 0

    PUBLIC DOMAIN