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Portal Powerhouse - Forebay

Description
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.
Type
Visual Materials(Opens in new tab)
Date
7/23/1955
Call number
photCL SCE 02 - 43311
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 - View from left abutment showing completed foundation preparation under a portion of rock fill section. Shovel and Dozer excavating in upstream cutoff.

    photCL SCE 02 - 43304

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    Portal Powerhouse - Forebay - Placing impervious blanket on morane slope upstream from right abutment.

    photCL SCE 02 - 43534

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    Portal Powerhouse - Forebay - Impervious fill upstream and start of rock fill in sluicepipe area of forebay dam.

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    Portal Powerhouse - Forebay - Upstream toe of rock fill section of forebay dam showing pervious filter layer in place between rock fill and impervious sections of embankment.

    photCL SCE 02 - 43549

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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.

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    Portal Powerhouse - Forebay - Progress picture - excavating in upstream cut-off between sluiceway and left abutment.

    photCL SCE 02 - 43316