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 - Forebay
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Portal Powerhouse - Forebay - Completed concrete encasement around 24" diameter sluice pipe through rock fill downstream section.
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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.
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Portal Powerhouse - Installing scroll case.
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Portal Powerhouse - First stages of Scroll Case and Butterfly Valve.
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Portal Powerhouse - Installing backing I-beams (15") prior to forming for concrete. Strengthening to reduce vibration during high flows.
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Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Installing 6" dia. drain in foundation, sluice pipe area, prior to any fill. Note form for concrete cutoff around pipe. One of three installed.
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