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| Keywords: General view of contractor's sand and gravel plant... - NARA - 294028.tif Scope and content Photograph from Volume Two of a series of photo albums documenting the construction of the Grand Coulee Dam and related work on the Columbia Basin Project General view of contractor's sand and gravel plant Electric shovels will load directly into hopper on farther end of the 200 foot conveyor boom discharging to a conveyor on top of the trestle shown at the top of the picture and which in turn discharges to a raw stock pipe directly below; a 60-inch belt in a tunnel under this stock pile carries this material to the scalping screens and crusher in the house directly in the center of the picture where plus 6-inch rock is reduced to the sizes required combining again with the other material and conveyed to the balancing pile; from this point to two conveyors in tunnels under the balancing pile transport the sand and gravel to the screening and washing plant which is built in duplicate; the aggregate is then classified drained of surplus water and placed in stock piles some 6 000 feet upstream near the east end of the dam On the hillside is shown the surge tank at the end of the 16-inch water supply line from pump 690 feet below on the Columbia River The dump in the foreground is the beginning of waste pile General notes 294028 Local identifier Department of the Interior Bureau of Reclamation Engineering and Research Center 05/18/1981 - 03/04/1988 NARA's Rocky Mountain Region Denver NRGA Building 48 Denver Federal Center West 6th Avenue and Kipling Street Denver CO 80225-0307 1935-09 Record group Record Group 115 Records of the Bureau of Reclamation 1889 - 2008 Record group ARC 444 Photograph albums compiled 1903 - 1972 Series ARC 293611 File unit File unit ARC Variant control numbers NAIL Control Number NRG-115-CONSTPHO85006-COLBASIN2735 yes Other versions <gallery> File General view of contractor's sand and gravel plant - NARA - 294028 jpg jpg </gallery> NARA-cooperation PD-USGov Construction of the Grand Coulee Dam NARA TIF images with categorized JPGs | ||||