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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - View of forming for substructure concrete, showing neat excavation in tight decomposed granite for the draft tube encasement.
Type: Visual Materials(Opens in new tab)
Date: 8/17/1955
Call number: photCL SCE 02 - 43623
Find out more: View in the Huntington Digital Library(Opens in new tab); View in the Library catalog(Opens in new tab)

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Portal Powerhouse - Foundation excavation in firm decomposed granite draft tube side of powerhouse. Excavation approx. 1' above final grade.
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