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Visual Materials

Portal Powerhouse - Forebay

Description: Portal Powerhouse - Forebay - Foundation excavation at location for sluice pipe, viewed from upstream.
Type: Visual Materials(Opens in new tab)
Date: 7/20/1955
Call number: photCL SCE 02 - 43586
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 - View from downstream of sluice pipe foundation excavation.
photCL SCE 02 - 43588
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Placing earthfill upstream from sluice pipe.
photCL SCE 02 - 43596
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 - Progress picture showing placement of upstream impervious fill in sluice pipe area, to top of 24" sluice pipe concrete encasement.
photCL SCE 02 - 43327
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Placing first fill in impervious section under location of sluice pipe. Note dozer pushing layer of saturated & disturbed surface material, exposing firm foundation, before fill placement.
photCL SCE 02 - 43315
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Preparation for rolling 24" diameter sluice pipe in place at forebay dam.
photCL SCE 02 - 43332