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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Final leveling of Scroll Case prior to concrete encasement.
Type: Visual Materials(Opens in new tab)
Date: June 1956
Call number: photCL SCE 02 - 44618
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
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Portal Powerhouse - Installing scroll case.
photCL SCE 02 - 44616
Portal Powerhouse
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Portal Powerhouse - View of forming for substructure concrete, showing neat excavation in tight decomposed granite for the draft tube encasement.
photCL SCE 02 - 43623
Portal Powerhouse
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Portal Powerhouse - First stages of Scroll Case and Butterfly Valve.
photCL SCE 02 - 44617
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Completed concrete encasement around 24" diameter sluice pipe through rock fill downstream section.
photCL SCE 02 - 43536
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Progress picture showing placement of upstream impervious fill in sluice pipe area, to top of 24" sluice pipe concrete encasement.
photCL SCE 02 - 43327
Portal Powerhouse
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Portal Powerhouse - Installing backing I-beams (15") prior to forming for concrete. Strengthening to reduce vibration during high flows.
photCL SCE 02 - 43902