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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Forebay - Cut-off excavation to bedrock at Station 3+00.
Type: Visual Materials(Opens in new tab)
Date: 7/28/1955
Call number: photCL SCE 02 - 43600
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 - Evidence of bed rock exposed by excavation between Stations 2+00 & 3+00, near the left abutment and along dam axis.
photCL SCE 02 - 43326
Portal Powerhouse
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Portal Powerhouse - Forebay - Foundation excavation in vicinity of sluice pipe. Picture covers from axis to upstream toe. Dragline excavating for impervious cut-off upstream from toe to lessen seepage.
photCL SCE 02 - 43310
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Scraping foundation of dam site near Station 3+00.
photCL SCE 02 - 43585
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Large boulder in dam foundation at station 5+00.
photCL SCE 02 - 43587
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Exposed bedrock in upstream cutoff between Stations 3+50 and 4+25.
photCL SCE 02 - 43318
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - View from station 5+00, looking toward left abutment, showing outcroppings of ledge rock while excavating for upstream cutoff under impervious section.
photCL SCE 02 - 43311