Portal Powerhouse

Description: Portal Powerhouse - Showing excavation for powerhouse building.
Type: Visual Materials(Opens in new tab)
Date: 8/6/1955
Call number: photCL SCE 02 - 43539
Find out more: View in the Huntington Digital Library(Opens in new tab); View in the Library catalog(Opens in new tab)

Daily: 10 A.M.–5 P.M.

Closed on Tuesdays

1151 Oxford Road
San Marino, CA 91108

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Portal Powerhouse
Visual Materials
Portal Powerhouse - Progress picture showing excavation in progress in powerhouse and weir area.
photCL SCE 02 - 43330
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 - Further excavation for Portal Powerhouse.
photCL SCE 02 - 43610
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Looking up inlet channel, showing excavation progress.
photCL SCE 02 - 43548
Portal Powerhouse
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Portal Powerhouse - Cut bank in rear of powerhouse structure showing extent of minor washing due to overflow of seepage water into excavation.
photCL SCE 02 - 43734
Portal Powerhouse
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Portal Powerhouse - View from highway bridge showing excavation progress in tailrace channel section isolated by diverting flow into Potter Creek Tunnel.
photCL SCE 02 - 43562