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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Rock fill dike across Rancheria Creek to form detention pond for surge overflow.
Type: Visual Materials(Opens in new tab)
Date: 9/22/1956
Call number: photCL SCE 02 - 44818
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 - Outlet end and anchor on concrete overflow pipe from surge chamber.
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Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Progress picture placing fill in dike embankment.
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Portal Powerhouse - First stage of Surge Tank excavation. Rock near top is decomposed granite.
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Portal Powerhouse - Lowering grade in diversion channel lower Rancheria Creek section
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Portal Powerhouse
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Portal Powerhouse - Test flow of 490 c.f.s. through the enlarged Rancheria Creek channel.
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